Pub Date : 2024-04-10DOI: 10.1021/acs.jced.4c00046
Jiaming Zhu, Feihu Li, Xiwei Hu, Qunsheng Li and Hongkang Zhao*,
This study investigates the phase equilibrium behavior of the isopropyl acetate (IAC)-isopropanol (IPA) azeotrope system at 101.3 kPa in the presence of three different imidazolium-based ionic liquids (ILs) as entrainers, 1-butyl-3-methylimidazolium acetate ([BMIM][Ac]), 1-butyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide ([BMIM][NTf2]), and 1-hexyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide ([HMIM][NTf2]). First, according to the measured vapor–liquid equilibrium (VLE) data of the binary system IAC(1)-IPA(2) and the ternary system IAC(1)-IPA(2)-ILs(3), [BMIM][Ac] in the ternary system produces a strong salting-in effect on IPA, while [BMIM][NTf2] and [HMIM][NTf2] produces a salting-in effect on IAC, and the effect of [BMIM][Ac] is much stronger than [BMIM][NTf2] and [HMIM][NTf2]. This work uses the nonrandom (local) two-liquid equation to correlate the VLE data. The mole fractions of [BMIM][Ac], [BMIM][NTf2], and [HMIM][NTf2] required to exactly eliminate the azeotropic point of the IAC-IPA system are 0.035, 0.144, and 0.206, respectively.
{"title":"Isobaric Phase Equilibrium of Isopropyl Acetate–Isopropanol–Imidazolium-Based Ionic Liquids at 101.3 kPa","authors":"Jiaming Zhu, Feihu Li, Xiwei Hu, Qunsheng Li and Hongkang Zhao*, ","doi":"10.1021/acs.jced.4c00046","DOIUrl":"10.1021/acs.jced.4c00046","url":null,"abstract":"<p >This study investigates the phase equilibrium behavior of the isopropyl acetate (IAC)-isopropanol (IPA) azeotrope system at 101.3 kPa in the presence of three different imidazolium-based ionic liquids (ILs) as entrainers, 1-butyl-3-methylimidazolium acetate ([BMIM][Ac]), 1-butyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide ([BMIM][NTf<sub>2</sub>]), and 1-hexyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide ([HMIM][NTf<sub>2</sub>]). First, according to the measured vapor–liquid equilibrium (VLE) data of the binary system IAC(1)-IPA(2) and the ternary system IAC(1)-IPA(2)-ILs(3), [BMIM][Ac] in the ternary system produces a strong salting-in effect on IPA, while [BMIM][NTf<sub>2</sub>] and [HMIM][NTf<sub>2</sub>] produces a salting-in effect on IAC, and the effect of [BMIM][Ac] is much stronger than [BMIM][NTf<sub>2</sub>] and [HMIM][NTf<sub>2</sub>]. This work uses the nonrandom (local) two-liquid equation to correlate the VLE data. The mole fractions of [BMIM][Ac], [BMIM][NTf<sub>2</sub>], and [HMIM][NTf<sub>2</sub>] required to exactly eliminate the azeotropic point of the IAC-IPA system are 0.035, 0.144, and 0.206, respectively.</p>","PeriodicalId":42,"journal":{"name":"Journal of Chemical & Engineering Data","volume":null,"pages":null},"PeriodicalIF":2.6,"publicationDate":"2024-04-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140580287","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-04-06DOI: 10.1021/acs.jced.3c00700
Xianteng Meng, Haijun Yan, Wenge Yang* and Yonghong Hu*,
In this experiment, we used eight pure solvents and three binary solvents to measure the solubility data of adefovir (AF) in the temperature range of 278.15–323.15 K. To ensure the accuracy of these data, we employed thermodynamic models to fit the data and assess their accuracy. We observed that the solubility of adefovir in all solvents increased with the temperature. Among the pure solvents, DMF exhibited the highest solubility of adefovir, while the solubility of adefovir in toluene was the lowest. The solubility of adefovir improved as the positive solvent’s molar fraction increased in the binary solvent mixtures. All five models effectively fitted the solubility data, and the reliability of the results was confirmed by comparing the relative average deviation (RAD) and the root-mean-square deviation (RMSD) for each model. In conclusion, the modified Apelblat model was found to be more effective for pure solvents, while the CNIBS/R–K model demonstrated superior performance for binary solvents. Additionally, analysis of the pure solvent parameters using the KAT-LSER model revealed that the hydrogen bonding alkalinity of the solvents was the main factor influencing the solubility of adefovir in the solvent.
{"title":"Solubility Determination and Thermodynamic Model Analysis of Adefovir in Different Solvents from 278.15 to 328.15 K","authors":"Xianteng Meng, Haijun Yan, Wenge Yang* and Yonghong Hu*, ","doi":"10.1021/acs.jced.3c00700","DOIUrl":"10.1021/acs.jced.3c00700","url":null,"abstract":"<p >In this experiment, we used eight pure solvents and three binary solvents to measure the solubility data of adefovir (AF) in the temperature range of 278.15–323.15 K. To ensure the accuracy of these data, we employed thermodynamic models to fit the data and assess their accuracy. We observed that the solubility of adefovir in all solvents increased with the temperature. Among the pure solvents, DMF exhibited the highest solubility of adefovir, while the solubility of adefovir in toluene was the lowest. The solubility of adefovir improved as the positive solvent’s molar fraction increased in the binary solvent mixtures. All five models effectively fitted the solubility data, and the reliability of the results was confirmed by comparing the relative average deviation (RAD) and the root-mean-square deviation (RMSD) for each model. In conclusion, the modified Apelblat model was found to be more effective for pure solvents, while the CNIBS/R–K model demonstrated superior performance for binary solvents. Additionally, analysis of the pure solvent parameters using the KAT-LSER model revealed that the hydrogen bonding alkalinity of the solvents was the main factor influencing the solubility of adefovir in the solvent.</p>","PeriodicalId":42,"journal":{"name":"Journal of Chemical & Engineering Data","volume":null,"pages":null},"PeriodicalIF":2.6,"publicationDate":"2024-04-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140580142","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-04-04DOI: 10.1021/acs.jced.3c00780
Alifah N. A. Fajrin, Rendra P. Anugraha and K. Kuswandi*,
Liquid–liquid equilibrium data for ternary systems of geraniol + ethanol + water and citronellol + ethanol + water were obtained experimentally under atmospheric pressure and at temperatures of 303.15 and 323.15 K. The experiment was carried out using a jacketed equilibrium cell as a reference for citronella oil derivative component purification by the solvent extraction method. The experiment was held for 4 h stirring and 20 h settling before the organic and aqueous sample phases were taken to be analyzed. Gas chromatography was used to analyze the equilibrium samples of the organic and aqueous phase compositions. The experimental data were found to be thermodynamically consistent with the Othmer–Tobias and Bachman–Brown correlations. The data were well-correlated by NRTL and UNIQUAC models with rmsd ranging from 0.0086 to 0.0164 and following the type 1 classification by Treybal.
{"title":"Liquid–Liquid Equilibria for Ternary Systems of Geraniol/Citronellol + Ethanol + Water at 303.15 and 323.15 K under Atmospheric Pressure","authors":"Alifah N. A. Fajrin, Rendra P. Anugraha and K. Kuswandi*, ","doi":"10.1021/acs.jced.3c00780","DOIUrl":"10.1021/acs.jced.3c00780","url":null,"abstract":"<p >Liquid–liquid equilibrium data for ternary systems of geraniol + ethanol + water and citronellol + ethanol + water were obtained experimentally under atmospheric pressure and at temperatures of 303.15 and 323.15 K. The experiment was carried out using a jacketed equilibrium cell as a reference for citronella oil derivative component purification by the solvent extraction method. The experiment was held for 4 h stirring and 20 h settling before the organic and aqueous sample phases were taken to be analyzed. Gas chromatography was used to analyze the equilibrium samples of the organic and aqueous phase compositions. The experimental data were found to be thermodynamically consistent with the Othmer–Tobias and Bachman–Brown correlations. The data were well-correlated by NRTL and UNIQUAC models with rmsd ranging from 0.0086 to 0.0164 and following the type 1 classification by Treybal.</p>","PeriodicalId":42,"journal":{"name":"Journal of Chemical & Engineering Data","volume":null,"pages":null},"PeriodicalIF":2.6,"publicationDate":"2024-04-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140580290","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-04-03DOI: 10.1021/acs.jced.4c00053
Joseph Abhisheka Rao Boravelli, and , Anil B. Vir*,
Micellar aqueous two-phase systems (ATPSs) find prominent applications in the extraction of hydrophobic solutes owing to their low interfacial tension. In this study, we investigated the liquid–liquid equilibrium (298.15 T/K and 101.325 P/kPa) and phase-forming abilities of organic (trisodium-citrate dihydrate and potassium sodium tartrate tetrahydrate) and inorganic (ammonium sulfate and ammonium phosphate dibasic) salts with an amphiphilic surfactant, Triton X-100. The experimental binodal curves for four micellar ATPSs were determined employing the cloud point method, and tie-line compositions were calculated using the gravimetric approach. The experimentally determined equilibrium data were thermodynamically correlated using effective excluded volume theory. For tie-line data accuracy, the Othmer–Tobias and Bancroft equations were used, and the corresponding correlation coefficients were reported. The phase separation ability of organic and inorganic salts was analyzed by using the Hofmeister series. Furthermore, we explored the effectiveness of micellar ATPSs in extracting hazardous pollutants from the textile industry, Rhodamine B (RB) and Chromium(VI) (Cr6+). Extraction experiments showed RB partitioning almost entirely (%E ∼ 99%) into a surfactant-rich phase, and ammonium sulfate-based ATPSs offered the highest extraction for the Cr6+ metal ion (% E = 81%). This study showcases the cost-effective way for the extraction of harmful hydrophobic industrial pollutants.
{"title":"Liquid–Liquid Equilibrium Data of Various Micellar Aqueous Two-Phase Systems for the Extraction of Rhodamine B and Hexavalent Chromium","authors":"Joseph Abhisheka Rao Boravelli, and , Anil B. Vir*, ","doi":"10.1021/acs.jced.4c00053","DOIUrl":"10.1021/acs.jced.4c00053","url":null,"abstract":"<p >Micellar aqueous two-phase systems (ATPSs) find prominent applications in the extraction of hydrophobic solutes owing to their low interfacial tension. In this study, we investigated the liquid–liquid equilibrium (298.15 T/K and 101.325 P/kPa) and phase-forming abilities of organic (trisodium-citrate dihydrate and potassium sodium tartrate tetrahydrate) and inorganic (ammonium sulfate and ammonium phosphate dibasic) salts with an amphiphilic surfactant, Triton X-100. The experimental binodal curves for four micellar ATPSs were determined employing the cloud point method, and tie-line compositions were calculated using the gravimetric approach. The experimentally determined equilibrium data were thermodynamically correlated using effective excluded volume theory. For tie-line data accuracy, the Othmer–Tobias and Bancroft equations were used, and the corresponding correlation coefficients were reported. The phase separation ability of organic and inorganic salts was analyzed by using the Hofmeister series. Furthermore, we explored the effectiveness of micellar ATPSs in extracting hazardous pollutants from the textile industry, Rhodamine B (RB) and Chromium(VI) (Cr<sup>6+</sup>). Extraction experiments showed RB partitioning almost entirely (%<i>E</i> ∼ 99%) into a surfactant-rich phase, and ammonium sulfate-based ATPSs offered the highest extraction for the Cr<sup>6+</sup> metal ion (% <i>E</i> = 81%). This study showcases the cost-effective way for the extraction of harmful hydrophobic industrial pollutants.</p>","PeriodicalId":42,"journal":{"name":"Journal of Chemical & Engineering Data","volume":null,"pages":null},"PeriodicalIF":2.6,"publicationDate":"2024-04-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140580137","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-04-02DOI: 10.1021/acs.jced.3c00653
Eda Cagli, Harrison Liu, Vaishali Khokhar, Aidan Klemm, Burcu E. Gurkan
Binary solvent mixtures based on 1-ethyl-3-methylimidazolium 2-cyanopyrrolide, [EMIM][2-CNpyr], an ionic liquid (IL), and a series of hydrogen bond donors (HBDs) including ethylene glycol (EG), propylene glycol (PG), and monoethanolamine (MEA) were characterized in terms of temperature-dependent densities and viscosities along with their thermal stability and CO2 absorption–desorption capability. NMR and FTIR were employed to observe the effect of the IL/HBD composition on intermolecular interactions. Among the investigated mixtures, IL/EG (1:2) showed the most efficient absorption–desorption performance and thermal stability. Though IL/PG and IL/EG had similar CO2 absorption capacities, the IL/PG exhibited the highest viscosity, which limited the CO2 transport in the solvent. The IL/MEA solvent possesses significant CO2 absorbance capability; however, the strong binding energy between MEA and CO2 and the increased viscosity during absorption led to difficulties in CO2 desorption. This study highlights the modification of intermolecular interactions in IL/HBD binary mixtures with respect to the choice of HBDs, reflected by their distinct physical properties and CO2 binding behavior.
{"title":"Thermal and Physical Properties of CO2-Reactive Binary Mixtures","authors":"Eda Cagli, Harrison Liu, Vaishali Khokhar, Aidan Klemm, Burcu E. Gurkan","doi":"10.1021/acs.jced.3c00653","DOIUrl":"https://doi.org/10.1021/acs.jced.3c00653","url":null,"abstract":"Binary solvent mixtures based on 1-ethyl-3-methylimidazolium 2-cyanopyrrolide, [EMIM][2-CNpyr], an ionic liquid (IL), and a series of hydrogen bond donors (HBDs) including ethylene glycol (EG), propylene glycol (PG), and monoethanolamine (MEA) were characterized in terms of temperature-dependent densities and viscosities along with their thermal stability and CO<sub>2</sub> absorption–desorption capability. NMR and FTIR were employed to observe the effect of the IL/HBD composition on intermolecular interactions. Among the investigated mixtures, IL/EG (1:2) showed the most efficient absorption–desorption performance and thermal stability. Though IL/PG and IL/EG had similar CO<sub>2</sub> absorption capacities, the IL/PG exhibited the highest viscosity, which limited the CO<sub>2</sub> transport in the solvent. The IL/MEA solvent possesses significant CO<sub>2</sub> absorbance capability; however, the strong binding energy between MEA and CO<sub>2</sub> and the increased viscosity during absorption led to difficulties in CO<sub>2</sub> desorption. This study highlights the modification of intermolecular interactions in IL/HBD binary mixtures with respect to the choice of HBDs, reflected by their distinct physical properties and CO<sub>2</sub> binding behavior.","PeriodicalId":42,"journal":{"name":"Journal of Chemical & Engineering Data","volume":null,"pages":null},"PeriodicalIF":2.694,"publicationDate":"2024-04-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140580138","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-04-02DOI: 10.1021/acs.jced.4c00037
Abdullah Aljasmi*, Adel S. AlJimaz, Khaled H. A. E. AlKhaldi and Abubaker A. Mohammad,
The densities, refractive indices, viscosities, surface tensions, and speed of sound of [Cneim][PF6] (n = 3, 4) and [Cnmim][PF6] (n = 4, 5, 6, 7, 8, 9) were experimentally determined and analyzed at temperatures ranging from 293.15 to 343.15 K, under atmospheric pressure conditions. All of the properties decrease as the temperature increases, as expected, with viscosity being the most influenced by the temperature change. The density, speed of sound, surface tension, and refractive index are estimated by using linear correlation as a function of temperature, whereas viscosity is correlated by using the well-known Vogel–Fulcher–Tammann (VFT) equation. The corresponding coefficients of thermal expansion were determined by using the experimental density data. Moreover, the Laplace–Newton equation was used to calculate the isentropic compressibility. Furthermore, the influence of anion type and alkyl chains on the thermophysical properties of the studied ionic liquids is studied. Based on the findings, the physical properties of the investigated ionic liquids are greatly influenced by the nature of the anion, while the alkyl chain has less significance. As the alkyl chain length increases, the density, speed of sound, and surface tension all decrease. Viscosity and refractive index, on the other hand, exhibit diametrically opposed behavior. Furthermore, a comparison between theoretical models for density, surface tension, speed of sound, and experimental values obtained from this work is discussed.
{"title":"Influence of Temperature, Anions, and Alkyl Chain Length on the Density, Viscosity, Speed of Sound, Surface Tension, and Refractive Index of Imidazolium Hexafluorophosphate-Based Ionic Liquids","authors":"Abdullah Aljasmi*, Adel S. AlJimaz, Khaled H. A. E. AlKhaldi and Abubaker A. Mohammad, ","doi":"10.1021/acs.jced.4c00037","DOIUrl":"https://doi.org/10.1021/acs.jced.4c00037","url":null,"abstract":"<p >The densities, refractive indices, viscosities, surface tensions, and speed of sound of [C<i><sub>n</sub></i>eim][PF<sub>6</sub>] (<i>n</i> = 3, 4) and [C<i><sub>n</sub></i>mim][PF<sub>6</sub>] (<i>n</i> = 4, 5, 6, 7, 8, 9) were experimentally determined and analyzed at temperatures ranging from 293.15 to 343.15 K, under atmospheric pressure conditions. All of the properties decrease as the temperature increases, as expected, with viscosity being the most influenced by the temperature change. The density, speed of sound, surface tension, and refractive index are estimated by using linear correlation as a function of temperature, whereas viscosity is correlated by using the well-known Vogel–Fulcher–Tammann (VFT) equation. The corresponding coefficients of thermal expansion were determined by using the experimental density data. Moreover, the Laplace–Newton equation was used to calculate the isentropic compressibility. Furthermore, the influence of anion type and alkyl chains on the thermophysical properties of the studied ionic liquids is studied. Based on the findings, the physical properties of the investigated ionic liquids are greatly influenced by the nature of the anion, while the alkyl chain has less significance. As the alkyl chain length increases, the density, speed of sound, and surface tension all decrease. Viscosity and refractive index, on the other hand, exhibit diametrically opposed behavior. Furthermore, a comparison between theoretical models for density, surface tension, speed of sound, and experimental values obtained from this work is discussed.</p>","PeriodicalId":42,"journal":{"name":"Journal of Chemical & Engineering Data","volume":null,"pages":null},"PeriodicalIF":2.6,"publicationDate":"2024-04-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140542326","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-04-01DOI: 10.1021/acs.jced.4c00039
Patrick S. Schmidt, Maximilian Piszko and Andreas P. Fröba*,
This work reports Fick diffusion coefficients D11 and thermal diffusivities a in binary liquid mixtures containing cyclohexane, n-decane, n-heptane, toluene, isobutylbenzene, 1-methylnaphthalene, methanol, ethanol, or acetone. The mixtures are investigated by dynamic light scattering at temperatures T = 298, 348, and 423 K close to saturation conditions. Besides equimolar composition, toluene-based binary mixtures with methanol, ethanol, or cyclohexane are investigated at toluene mole fractions between 0.1 and 0.9. The average relative expanded experimental uncertainties (k = 2) for D11 and a are 5.3 and 8.3%. For the studied systems, the influence of molecular characteristics on the diffusivities as a function of T and composition is discussed. While D11 clearly depends on the molecular structure of the mixture components, i.e., alkane chain length, aliphatic or aromatic rings, or hydroxyl and carbonyl functional groups, such relationships were not resolvable for a within the experimental uncertainties. For mixtures containing the polar species methanol, ethanol, or acetone, an influence of hydrogen bonding on D11 was found. In general, the identified structure–property relationships agree with those reported in the literature for similar systems. Furthermore, a comparison of the present D11 and a data with corresponding literature data is performed.
这项研究报告了含有环己烷、正癸烷、正庚烷、甲苯、异丁基苯、1-甲基萘、甲醇、乙醇或丙酮的二元液体混合物中的菲克扩散系数 D11 和热扩散率 a。混合物在接近饱和条件的温度 T = 298、348 和 423 K 下进行动态光散射研究。除了等摩尔成分外,还研究了甲苯与甲醇、乙醇或环己烷的二元混合物,甲苯摩尔分数介于 0.1 和 0.9 之间。D11 和 a 的平均相对扩大实验不确定度 (k = 2) 分别为 5.3% 和 8.3%。对于所研究的体系,讨论了分子特性对扩散系数的影响,即扩散系数是 T 和组成的函数。虽然 D11 显然取决于混合物成分的分子结构,即烷烃链长、脂肪族或芳香环、羟基和羰基官能团,但在实验不确定性范围内,这种关系无法解决 a 的问题。对于含有极性物质甲醇、乙醇或丙酮的混合物,发现氢键对 D11 有影响。总的来说,已确定的结构-性质关系与文献中报道的类似体系的结构-性质关系一致。此外,还将目前的 D11 和 a 数据与相应的文献数据进行了比较。
{"title":"Fick Diffusion Coefficients in Binary Liquid Mixtures Containing Alkanes, Aromatics, Alcohols, or Acetone by Using Dynamic Light Scattering","authors":"Patrick S. Schmidt, Maximilian Piszko and Andreas P. Fröba*, ","doi":"10.1021/acs.jced.4c00039","DOIUrl":"https://doi.org/10.1021/acs.jced.4c00039","url":null,"abstract":"<p >This work reports Fick diffusion coefficients <i>D</i><sub>11</sub> and thermal diffusivities <i>a</i> in binary liquid mixtures containing cyclohexane, <i>n</i>-decane, <i>n</i>-heptane, toluene, isobutylbenzene, 1-methylnaphthalene, methanol, ethanol, or acetone. The mixtures are investigated by dynamic light scattering at temperatures <i>T</i> = 298, 348, and 423 K close to saturation conditions. Besides equimolar composition, toluene-based binary mixtures with methanol, ethanol, or cyclohexane are investigated at toluene mole fractions between 0.1 and 0.9. The average relative expanded experimental uncertainties (<i>k</i> = 2) for <i>D</i><sub>11</sub> and <i>a</i> are 5.3 and 8.3%. For the studied systems, the influence of molecular characteristics on the diffusivities as a function of <i>T</i> and composition is discussed. While <i>D</i><sub>11</sub> clearly depends on the molecular structure of the mixture components, i.e., alkane chain length, aliphatic or aromatic rings, or hydroxyl and carbonyl functional groups, such relationships were not resolvable for <i>a</i> within the experimental uncertainties. For mixtures containing the polar species methanol, ethanol, or acetone, an influence of hydrogen bonding on <i>D</i><sub>11</sub> was found. In general, the identified structure–property relationships agree with those reported in the literature for similar systems. Furthermore, a comparison of the present <i>D</i><sub>11</sub> and <i>a</i> data with corresponding literature data is performed.</p>","PeriodicalId":42,"journal":{"name":"Journal of Chemical & Engineering Data","volume":null,"pages":null},"PeriodicalIF":2.6,"publicationDate":"2024-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140542283","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-04-01DOI: 10.1021/acs.jced.3c00691
Marvin Dorn, Sabine Kareth, Eckhard Weidner and Marcus Petermann*,
CO2 can be electrochemically converted to commodity chemicals with the support of aqueous or organic electrolytes. However, aqueous electrolytes mainly lead to H2 production due to the low solubility of CO2 in water whereas organic electrolytes favor the formation of organic products. In addition to selectivity, fast CO2 conversion is also important, which is significantly influenced by the conductivity of the electrolyte. However, the most studied electrolytes are aqueous and at low salt concentrations. Therefore, in this work, the electrical conductivity of 164 electrolytes was investigated in a wide concentration range and a temperature range T = (288.15 to 333.15 K) using automated conductometry. After the measurements, the results were correlated using the Casteel–Amis equation. This choice was made because many factors affecting conductivity are well documented in the literature but not universally quantifiable for all electrolytes due to isolated consideration. The wide variety of different electrolytes investigated in this study highlights the importance of considering these factors holistically rather than in isolation. Nevertheless, NaI and KSCN in methanol and (C2H5)4NBF4 in acetonitrile were identified as the three organic electrolytes with the highest conductivity. These solutions have the potential to be used as electrolytes for CO2 reduction.
在水电解质或有机电解质的支持下,二氧化碳可以通过电化学方法转化为商品化学品。不过,由于 CO2 在水中的溶解度较低,水性电解质主要导致 H2 的产生,而有机电解质则有利于有机产品的形成。除了选择性之外,快速转化二氧化碳也很重要,而这在很大程度上受到电解质电导率的影响。然而,研究最多的电解质是低盐浓度的水性电解质。因此,在这项工作中,使用自动电导测量仪研究了 164 种电解质在较宽浓度范围和温度范围 T = (288.15 至 333.15 K) 内的电导率。测量结束后,使用卡斯特尔-阿米斯方程对结果进行了相关分析。之所以选择这种方法,是因为许多影响电导率的因素在文献中都有详细记载,但由于孤立考虑,并非所有电解质都能普遍量化。本研究调查了多种不同的电解质,这突出了全面而非孤立地考虑这些因素的重要性。不过,甲醇中的 NaI 和 KSCN 以及乙腈中的 (C2H5)4NBF4 被确定为电导率最高的三种有机电解质。这些溶液有可能用作二氧化碳还原的电解质。
{"title":"Electrical Conductivity of Lithium, Sodium, Potassium, and Quaternary Ammonium Salts in Water, Acetonitrile, Methanol, and Ethanol over a Wide Concentration Range","authors":"Marvin Dorn, Sabine Kareth, Eckhard Weidner and Marcus Petermann*, ","doi":"10.1021/acs.jced.3c00691","DOIUrl":"https://doi.org/10.1021/acs.jced.3c00691","url":null,"abstract":"<p >CO<sub>2</sub> can be electrochemically converted to commodity chemicals with the support of aqueous or organic electrolytes. However, aqueous electrolytes mainly lead to H<sub>2</sub> production due to the low solubility of CO<sub>2</sub> in water whereas organic electrolytes favor the formation of organic products. In addition to selectivity, fast CO<sub>2</sub> conversion is also important, which is significantly influenced by the conductivity of the electrolyte. However, the most studied electrolytes are aqueous and at low salt concentrations. Therefore, in this work, the electrical conductivity of 164 electrolytes was investigated in a wide concentration range and a temperature range <i>T</i> = (288.15 to 333.15 K) using automated conductometry. After the measurements, the results were correlated using the Casteel–Amis equation. This choice was made because many factors affecting conductivity are well documented in the literature but not universally quantifiable for all electrolytes due to isolated consideration. The wide variety of different electrolytes investigated in this study highlights the importance of considering these factors holistically rather than in isolation. Nevertheless, NaI and KSCN in methanol and (C<sub>2</sub>H<sub>5</sub>)<sub>4</sub>NBF<sub>4</sub> in acetonitrile were identified as the three organic electrolytes with the highest conductivity. These solutions have the potential to be used as electrolytes for CO<sub>2</sub> reduction.</p>","PeriodicalId":42,"journal":{"name":"Journal of Chemical & Engineering Data","volume":null,"pages":null},"PeriodicalIF":2.6,"publicationDate":"2024-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140542308","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-03-31DOI: 10.1021/acs.jced.4c00015
Xin Yin, Jing Wang and Shufeng Shen*,
The water-lean absorbent of dimethyl sulfoxide (DMSO)/2-(butylamino)ethanol (BAE)/H2O has recently been proposed for energy-efficient CO2 capture. The CO2/N2O analogy method can provide important fundamental data for its kinetic study. In this work, the physical solubility of N2O and CO2 in DMSO was measured in a static equilibrium cell at temperatures of (293.15–333.15) K. Solubility of N2O in BAE and the BAE/DMSO binary blends with 22.6, 34.9, and 61.8 mass % BAE was also determined. The effect of the water content on N2O solubility in the water-lean ternary blends with 61.8 mass % BAE was also discussed. The ratios of solubility of CO2 to N2O in polar solvents (i.e., DMSO and water) were found to be very close at temperatures of 323–333 K. Experimental solubility data and the ones calculated from the recommended correlation models match well with each other, with average absolute relative deviations within 0.9%.
{"title":"Solubility of N2O and CO2 in Dimethyl Sulfoxide, 2-(Butylamino)ethanol, and Their Water-Lean Blends","authors":"Xin Yin, Jing Wang and Shufeng Shen*, ","doi":"10.1021/acs.jced.4c00015","DOIUrl":"https://doi.org/10.1021/acs.jced.4c00015","url":null,"abstract":"<p >The water-lean absorbent of dimethyl sulfoxide (DMSO)/2-(butylamino)ethanol (BAE)/H<sub>2</sub>O has recently been proposed for energy-efficient CO<sub>2</sub> capture. The CO<sub>2</sub>/N<sub>2</sub>O analogy method can provide important fundamental data for its kinetic study. In this work, the physical solubility of N<sub>2</sub>O and CO<sub>2</sub> in DMSO was measured in a static equilibrium cell at temperatures of (293.15–333.15) K. Solubility of N<sub>2</sub>O in BAE and the BAE/DMSO binary blends with 22.6, 34.9, and 61.8 mass % BAE was also determined. The effect of the water content on N<sub>2</sub>O solubility in the water-lean ternary blends with 61.8 mass % BAE was also discussed. The ratios of solubility of CO<sub>2</sub> to N<sub>2</sub>O in polar solvents (i.e., DMSO and water) were found to be very close at temperatures of 323–333 K. Experimental solubility data and the ones calculated from the recommended correlation models match well with each other, with average absolute relative deviations within 0.9%.</p>","PeriodicalId":42,"journal":{"name":"Journal of Chemical & Engineering Data","volume":null,"pages":null},"PeriodicalIF":2.6,"publicationDate":"2024-03-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140542305","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-03-28DOI: 10.1021/acs.jced.3c00765
Joshua Marx, Kai Langenbach, Maximilian Kohns
Relative permittivities of binary mixtures of model fluids, i.e., mixtures of two different Stockmayer fluids or Stockmayer + Lennard-Jones mixtures, are studied comprehensively using molecular dynamics (MD) simulations. The molecular interaction parameters are varied systematically in such a way that the mixtures possess very different types of vapor–liquid equilibrium behavior. The simulation results reveal that in line with findings from previous work on pure components, also for these mixtures the relative permittivity is a univariate function of the dipole strength, which combines the influence of density, inverse temperature, the squared dipole moments of the components, and their mole fractions. Furthermore, the capabilities of the molecular thermodynamics framework COFFEE are extended to describing permittivities in such mixtures predictively. This is achieved by using Kirkwood’s equation for the relative permittivity together with the orientational information provided by COFFEE, which is necessary for calculating the Kirkwood factor. A suitable expression for the Kirkwood factor of mixtures is derived in detail. The predictions obtained with COFFEE as well as results from perturbation theories and empirical mixing rules from the literature are assessed systematically by comparison to the MD results. It is found that the perturbation theories developed solely for the purpose of modeling relative permittivities describe the data accurately, while only one of the empirical mixing rules does so as well. The new extension of COFFEE does not match the MD data as accurately; however, the main deficiencies arise from inaccuracies in the pure-component permittivities, while the general mixing characteristics are predicted correctly in all cases. The largest deviations occur at high densities and dipole moments, where it is known that the approximations in COFFEE lead to deviations in the orientation behavior.
{"title":"Assessment of Approaches towards the Relative Permittivity of Mixtures","authors":"Joshua Marx, Kai Langenbach, Maximilian Kohns","doi":"10.1021/acs.jced.3c00765","DOIUrl":"https://doi.org/10.1021/acs.jced.3c00765","url":null,"abstract":"Relative permittivities of binary mixtures of model fluids, i.e., mixtures of two different Stockmayer fluids or Stockmayer + Lennard-Jones mixtures, are studied comprehensively using molecular dynamics (MD) simulations. The molecular interaction parameters are varied systematically in such a way that the mixtures possess very different types of vapor–liquid equilibrium behavior. The simulation results reveal that in line with findings from previous work on pure components, also for these mixtures the relative permittivity is a univariate function of the dipole strength, which combines the influence of density, inverse temperature, the squared dipole moments of the components, and their mole fractions. Furthermore, the capabilities of the molecular thermodynamics framework COFFEE are extended to describing permittivities in such mixtures predictively. This is achieved by using Kirkwood’s equation for the relative permittivity together with the orientational information provided by COFFEE, which is necessary for calculating the Kirkwood factor. A suitable expression for the Kirkwood factor of mixtures is derived in detail. The predictions obtained with COFFEE as well as results from perturbation theories and empirical mixing rules from the literature are assessed systematically by comparison to the MD results. It is found that the perturbation theories developed solely for the purpose of modeling relative permittivities describe the data accurately, while only one of the empirical mixing rules does so as well. The new extension of COFFEE does not match the MD data as accurately; however, the main deficiencies arise from inaccuracies in the pure-component permittivities, while the general mixing characteristics are predicted correctly in all cases. The largest deviations occur at high densities and dipole moments, where it is known that the approximations in COFFEE lead to deviations in the orientation behavior.","PeriodicalId":42,"journal":{"name":"Journal of Chemical & Engineering Data","volume":null,"pages":null},"PeriodicalIF":2.694,"publicationDate":"2024-03-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140324949","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}