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Quantum Chemistry-Based Approach for Density Prediction of non-ionic Hydrophobic Eutectic Solvents 基于量子化学的非离子疏水共晶溶剂密度预测方法
IF 1.4 4区 化学 Q4 CHEMISTRY, PHYSICAL Pub Date : 2024-03-01 DOI: 10.1007/s10953-024-01372-w

Non-ionic hydrophobic eutectic solvents have emerged as a new class of eutectic solvents. They are prepared by mixing two non-ionic components. They have gained significant interest compared to their counterpart ionic hydrophobic eutectic solvents and hydrophobic ionic liquids due to the availability of a wide array of non-ionic substances that can be used to prepare these solvents. Understanding the distinct physical characteristics of these solvents is crucial to their practical application within process industries and associated fields. The present work reports the development of a density model for these solvents based on the conductor-like screening model (COSMO), a dielectric continuum solvation model. For this purpose, a comprehensive literature search was carried out, and 485 density points of 37 different hydrophobic non-ionic eutectic solvents were collected. COSMO volume, one of the outputs of the COSMO calculations, was correlated with the experimental molar volume for the model development. Two different models were developed, one at 298.15 K and another a general model that can predict the density over a wide temperature range at atmospheric pressure. The developed model only requires the molar ratio and COSMO volumes of the components forming the eutectic solvents to predict the density. The proposed general model performed better than most other models and was comparable with the best one reported in the literature, with an average relative deviation percent (ARD%) of 1.34%.

非离子疏水共晶溶剂是一类新型共晶溶剂。它们通过混合两种非离子成分制备而成。与相应的离子疏水共晶溶剂和疏水离子液体相比,非离子疏水共晶溶剂更受关注,因为有大量非离子物质可用于制备这些溶剂。了解这些溶剂的独特物理特性对于它们在加工工业和相关领域的实际应用至关重要。本研究以介电连续溶解模型--类导体筛选模型(COSMO)为基础,为这些溶剂开发了一个密度模型。为此,我们进行了全面的文献检索,收集了 37 种不同疏水性非离子共晶溶剂的 485 个密度点。COSMO 体积是 COSMO 计算的输出结果之一,与实验摩尔体积相关联,用于模型开发。开发了两个不同的模型,一个是 298.15 K 时的模型,另一个是可预测大气压下宽温度范围内密度的通用模型。所开发的模型只需要形成共晶溶剂的各组分的摩尔比和 COSMO 体积即可预测密度。所提出的通用模型的性能优于大多数其他模型,与文献报道的最佳模型不相上下,平均相对偏差率(ARD%)为 1.34%。
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引用次数: 0
Zinc (II)–Boron (III) Aqueous Complex Formation Between 25 and 70 °C 锌 (II) - 硼 (III) 水络合物在 25 至 70 °C 之间的形成
IF 1.4 4区 化学 Q4 CHEMISTRY, PHYSICAL Pub Date : 2024-02-27 DOI: 10.1007/s10953-023-01357-1

The zinc boron complex formation was studied as a function of temperature (25, 50 and 70 °C) in boric acid solutions of various concentration (0.25, 0.50 and 0.68 mol·kg−1). pH was monitored during zinc ion addition by galvanostatic dissolution of a zinc metal electrode, in a solution of boric acid. The determination of the complex formation showed the importance of an accurate model of the polyborate speciation, recalculated for this work based on the previous literature data mainly potentiometric measurements completed by Raman spectroscopy and Ab Initio calculations. Modelling of our experimental results, considering various scenarios of boric acid speciation, was performed using R and PhreeqC, suggesting the formation of an aqueous triborate-zinc (II) complex, ({{text{ZnB}}}_{3}{{text{O}}}_{3}{({text{OH}})}_{4({text{aq}})}^{+},) according to the reaction: ({{text{Zn}}}^{2+}+3{{text{B}}({text{OH}})}_{3} rightleftharpoons {{text{ZnB}}}_{3}{{text{O}}}_{3}{({text{OH}})}_{4({text{aq}})}^{+}+2{{text{H}}}_{2}{text{O}}+{{text{H}}}^{+}). The nature and structure of this aqueous complex disagrees with the results reported previously in the literature. Three formation constants of the triborate-zinc (II) complex were determined at 25, 50 and 70 °C as ({{text{log}}}_{10}{K}_{text{ZnB}}) = − 4.73 ± 0.10, − 4.21 ± 0.16 and − 4.94 ± 0.12, respectively. The evolution of zinc boron complex formation as a function of temperature (between 25 and 70 °C) provides information on the effect of the polyborate predominance in the solution on the complexation of zinc.

在不同浓度(0.25、0.50 和 0.68 mol-kg-1)的硼酸溶液中,研究了锌硼络合物的形成与温度(25、50 和 70 °C)的函数关系。在锌离子添加过程中,通过锌金属电极在硼酸溶液中的静电溶解来监测 pH 值。对复合物形成的测定表明,精确的聚硼酸酯标示模型非常重要,该模型是根据以前的文献数据重新计算的,主要是通过拉曼光谱和 Ab Initio 计算完成的电位测量。使用 R 和 PhreeqC 对我们的实验结果进行了建模,考虑到了硼酸标示的各种情况,结果表明根据反应形成了一种水性三硼酸盐-锌(II)复合物,({{text{ZnB}}}_{3}{{text{O}}}_{3}{({text{OH}})}_{4({text{aq}})}^{+},):({{text{Zn}}}^{2+}+3{{text{B}}({text{OH}})}_{3}rightleftharpoons {{text{ZnB}}}_{3}{{text{O}}}_{3}{({text{OH}})}_{4({text{aq}})}^{+}+2{{text{H}}}_{2}{text{O}}+{{text{H}}}^{+}).这种水性复合物的性质和结构与之前文献报道的结果不一致。在 25、50 和 70 °C 时,三硼酸锌 (II) 复合物的三个形成常数分别为 ({{text{log}}_{10}{K}_{text{ZnB}}) = - 4.73 ± 0.10、- 4.21 ± 0.16 和 - 4.94 ± 0.12。锌硼络合物的形成随温度(25 至 70 °C)的变化提供了溶液中聚硼酸盐占优势对锌络合作用影响的信息。
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引用次数: 0
Acoustical Studies of Some Derivatives of Pyrimidine-Substituted Azetidine in Binary Liquid Mixture at Different Temperatures 不同温度下二元液体混合物中嘧啶取代氮杂环丁烷某些衍生物的声学研究
IF 1.4 4区 化学 Q4 CHEMISTRY, PHYSICAL Pub Date : 2024-02-22 DOI: 10.1007/s10953-024-01362-y
Dinesh R. Godhani, Umang P. Mehta, Anwar H. Saiyad, Kuldip P. Parmar, Jignasu P. Mehta

In a binary liquid mixture containing pyrimidine-substituted azetidinone ultrasonic velocities, densities, and viscosities have been measured by unit of molality azetidinone at temperatures T = (298.15, 308.15, and 313.15 K). 3-chloro-4-(4-nitrophenyl)-1-(pyrimidin-2-yl)azetidin-2-one (AT1) and 3-chloro-4-(4-chlorophenyl)-1-(pyrimidin-2-yl)azetidin-2-one (AT2) in N,N-dimethylformamide (DMF) and dimethyl sulfoxide (DMSO) were studied. The density, dynamic viscosity, and ultrasonic sound velocity have all been measured, among other acoustical and thermodynamic properties. Gibbs free energy of activation (ΔG*), enthalpy of activation (ΔH*), and entropy of activation (ΔS*) values have been studied further to determine how solvent changes and structural modifications impact these values. The molecular interactions between the components of the liquid combination have been used to explain these findings.

摘要 在温度 T = (298.15、308.15 和 313.15 K) 下,测量了含有嘧啶取代的氮杂环丁酮的二元液体混合物的超声波速度、密度和粘度(单位摩尔数氮杂环丁酮)。研究了 N,N-二甲基甲酰胺(DMF)和二甲基亚砜(DMSO)中的 3-氯-4-(4-硝基苯基)-1-(嘧啶-2-基)氮杂环丁烷-2-酮(AT1)和 3-氯-4-(4-氯苯基)-1-(嘧啶-2-基)氮杂环丁烷-2-酮(AT2)。除其他声学和热力学特性外,还测量了密度、动态粘度和超声波声速。对活化吉布斯自由能(ΔG*)、活化焓(ΔH*)和活化熵(ΔS*)值进行了进一步研究,以确定溶剂变化和结构改变对这些值的影响。液体组合成分之间的分子相互作用被用来解释这些发现。
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引用次数: 0
Salicylic Acid Solubility and Thermodynamic Dissociation Constant at Various Temperatures in Water: Variable Ionic Strength Titrimetric Analysis 不同温度下水杨酸在水中的溶解度和热力学解离常数:可变离子强度滴定分析
IF 1.4 4区 化学 Q4 CHEMISTRY, PHYSICAL Pub Date : 2024-02-21 DOI: 10.1007/s10953-023-01351-7

Titrimetric methods were used to estimate the molar solubility and apparent acid dissociation constant (Kc) of salicylic acid in water. This was done with varied ionic strength values ranging from 0.00 to 0.75 mol·L−1 and over a temperature range of 15 to 60 °C. The thermodynamic dissociation constant (as pKa) of salicylic acid was found to be 2.985 at 25 °C. Within the measured temperature range, there was no consistent association between the pKa of salicylic acid and the temperature. The pKa values exhibited an inverse relationship with temperatures between 15 and 40 °C, while they showed a direct relationship with temperatures between 40 and 60 °C. Through the use of the Van’t Hoff plot, the standard thermodynamic quantities (∆H°, ∆S°, and ∆G°) for the dissociation process of salicylic acid in water were calculated. For temperatures between 15 and 30 °C, these values were determined as 3.346 kJ·mol−1, − 19.99 JK−1·mol−1, and 9.306 kJ·mol−1 respectively. For the temperature range of 45 to 60 °C, the values were calculated as − 1.499 kJ·mol−1, − 27.06 kJ·K−1·mol−1, and 6.564 kJ·mol−1. The heat of solution (∆H °sol ) was computed using the Van’t Hoff Isochore plot across the temperature range of 15 to 60 °C, resulting in a value of 15.03 kJ·mol−1.

使用滴定法估算水杨酸在水中的摩尔溶解度和表观酸解离常数(Kc)。在 0.00 至 0.75 mol-L-1 的不同离子强度值和 15 至 60 °C 的温度范围内进行了估算。结果发现,在 25 °C 时,水杨酸的热力学解离常数(pKa)为 2.985。在测量的温度范围内,水杨酸的 pKa 与温度之间没有一致的联系。pKa 值与 15 至 40 °C 之间的温度呈反向关系,而与 40 至 60 °C 之间的温度呈直接关系。通过 Van't Hoff 图,计算出了水杨酸在水中解离过程的标准热力学量(∆H°、∆S° 和 ∆G°)。温度在 15 至 30 °C 之间时,这些数值分别为 3.346 kJ-mol-1、- 19.99 JK-1-mol-1 和 9.306 kJ-mol-1。在 45 至 60 °C 的温度范围内,计算值分别为 - 1.499 kJ-mol-1、- 27.06 kJ-K-1-mol-1 和 6.564 kJ-mol-1。在 15 至 60 °C 的温度范围内,溶液热量(∆H°sol)是通过 Van't Hoff 等值线图计算得出的,其值为 15.03 kJ-mol-1。
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引用次数: 0
Study of Thermodynamic and Rheological Properties of Sensitive Polymeric Nanoparticles as a Possible Application in the Oil Industry 敏感聚合物纳米粒子的热力学和流变学特性研究--在石油工业中的可能应用
IF 1.4 4区 化学 Q4 CHEMISTRY, PHYSICAL Pub Date : 2024-02-14 DOI: 10.1007/s10953-023-01354-4
Lazaro Ruiz-Virgen, Miguel Angel Hernández-Martínez, Gabriela Martínez-Mejía, Rubén Caro-Briones, José Manuel del Río, Mónica Corea

pH and thermo-sensitive polymeric nanoparticles with different morphology were synthesized by means of emulsion polymerization techniques. The materials were characterized by gravimetric techniques, dynamic light scattering (DLS), electrophoresis, Fourier transform infrared spectroscopy (FT-IR), scanning electron microscopy (SEM) and X-Ray diffraction (XRD). The specific volumetric thermodynamic properties were calculated from density (ρ) and sound velocity (u) measurement and they are influenced by the proportions and location of the functional groups in the polymeric particles and the temperature. Rheological properties were also measured, observing that polymeric materials were a non-Newtonian and pseudo-plastic behavior because of they have a decrease in viscosity (left(eta right)) values as the shear rate rises (left(dot{gamma }right)). In addition, to try to elucidate the behavior that the materials could have with calcite rock in the oil reservoirs, the materials were treated with CaCl2, and changes in the average particle size, colloidal stability and conformation of polymeric chains were observed. The obtained results show that the synthesized polymeric particles could be applied as a possible dosing agent in the interaction with calcium ions (Ca2+) in the calcite rock for petrol industry.

摘要 利用乳液聚合技术合成了不同形态的 pH 和热敏聚合物纳米粒子。通过重量测量技术、动态光散射(DLS)、电泳、傅立叶变换红外光谱(FT-IR)、扫描电子显微镜(SEM)和 X 射线衍射(XRD)对材料进行了表征。比容热力学性质是通过密度(ρ)和声速(u)的测量计算得出的,它们受聚合物颗粒中官能团的比例和位置以及温度的影响。流变特性也进行了测量,观察到聚合物材料具有非牛顿和假塑性行为,因为它们的粘度值随着剪切速率的升高而降低((left(dot{gamma }right))。此外,为了试图阐明这些材料与油藏中的方解石岩可能发生的行为,还用 CaCl2 处理了这些材料,并观察了平均粒径、胶体稳定性和聚合物链构象的变化。结果表明,合成的聚合物颗粒可用作与石油工业方解石中的钙离子(Ca2+)相互作用的剂量剂。
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引用次数: 0
Density, Speed of Sound, and Refractive Index of Binary Mixtures of Propiophenone + (3-Amino-1-propanol, Propylamine, or Isobutanol) at Temperatures of 298.15 to 308.15 K: Modeling by Prigogine–Flory–Patterson Theory 温度为 298.15 至 308.15 K 时苯丙酮 +(3-氨基-1-丙醇、丙胺或异丁醇)二元混合物的密度、声速和折射率:普里戈金-弗洛里-帕特森理论建模
IF 1.4 4区 化学 Q4 CHEMISTRY, PHYSICAL Pub Date : 2024-02-13 DOI: 10.1007/s10953-023-01350-8

In the present work, the density, speed of sound, and refractive index of binary mixtures of propiophenone (PP) with 3-amino-1-propanol (AP), propylamine (PA), or isobutanol (IB) were measured over whole composition range at temperatures 298.15 to 308.15 K and ambient pressure (0.1 MPa). From these experimental data the excess molar volume, ({V}_{text{m}}^{text{E}}), excess isoentropic compressibility, ({kappa }_{text{S}}^{text{E}},) and excess refractive index, ({n}_{text{D}}^{text{E}}), were calculated. The calculated excess molar properties were correlated by Redlich–Kister equation, and their coefficients and standard deviations were calculated. The results show that the ({V}_{text{m}}^{text{E}}) values of PP + AP are positive in the entire composition range and at all temperatures, while the ({V}_{text{m}}^{text{E}}) values of PP + PA and PP + IB mixtures are negative over whole composition range and at all temperatures. The obtained ({V}_{text{m}}^{text{E}}) values were also correlated by Prigogine–Flory–Patterson (PFP) theory which show good agreement between experimental and predicted data.

本研究测量了苯丙酮(PP)与 3-氨基-1-丙醇(AP)、丙胺(PA)或异丁醇(IB)的二元混合物在温度 298.15 至 308.15 K 和环境压力(0.1 MPa)条件下整个组成范围内的密度、声速和折射率。根据这些实验数据计算出了过量摩尔体积({V}_{text{m}}^{text{E}})、过量等熵可压缩性({kappa }_{text{S}}^{text{E}}, )和过量折射率({n}_{text{D}}^{text{E}})。用 Redlich-Kister 方程对计算得到的过量摩尔性质进行了相关分析,并计算了它们的系数和标准偏差。结果表明,PP + AP 的 ({V}_{text{m}}^{text{E}} 值在整个成分范围和所有温度下都是正值,而 PP + PA 和 PP + IB 混合物的 ({V}_{text{m}}^{text{E}} 值在整个成分范围和所有温度下都是负值。得到的 ({V}_{text{m}}^{text{E}}值还与 Prigogine-Flory-Patterson (PFP) 理论相关,实验数据与预测数据之间显示出良好的一致性。
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引用次数: 0
Role of Ethylenediammonium Dichromate in the Kinetic and Mechanistic Analysis of the Oxidation of Glycolic and Lactic Acids in Aqueous AcOH Medium 重铬酸乙二铵在乙醇水溶液介质中乙醇酸和乳酸氧化的动力学和机理分析中的作用
IF 1.4 4区 化学 Q4 CHEMISTRY, PHYSICAL Pub Date : 2024-02-10 DOI: 10.1007/s10953-023-01359-z

In aqueous acetic acid medium, the kinetics of oxidation of glycolic and lactic acid by ethylenediammonium dichromate [enH2Cr2O7] have been explored. The oxidation product is the corresponding oxoacid. The conventional UV–vis spectrophotometric method is used to study the reaction kinetics. First-order kinetics has been observed concerning [enH2Cr2O7] and with substrate the order is less than two. The fractional-order dependency with respect to substrate confirms the binding of oxidant and substrate to form a complex before rate-determining step. The rate of reaction increases with an increase in [H+] concentration. The existence of primary kinetic isotope effect, kH/kD = 5.97 at 298K for glycolic acid (ratio of rate constants for protio- and deuterio-glycolic acid) indicated a C–H bond cleavage rather than C–C bond cleavage. Variation of solvent polarity is found to impose a remarkable impact on the rate of oxidation. From the experimental data, formation of an unstable cyclic transition state followed by intra-molecular proton transfer has been proposed. Under similar conditions oxidation of lactic acid was studied.

在乙酸水介质中,研究人员探讨了乙醇酸和乳酸被乙二胺重铬酸盐[enH2Cr2O7]氧化的动力学。氧化产物是相应的氧化酸。采用传统的紫外-可见分光光度法研究反应动力学。观察到[enH2Cr2O7]的一阶动力学,而底物的一阶动力学小于二阶。与底物的分数阶相关性证实了氧化剂和底物在决定速率的步骤之前结合形成复合物。反应速率随着[H+]浓度的增加而增加。在 298K 时,乙醇酸存在主要动力学同位素效应 kH/kD = 5.97(原乙醇酸和氘代乙醇酸的速率常数之比),这表明是 C-H 键裂解而不是 C-C 键裂解。溶剂极性的变化对氧化速率有显著影响。根据实验数据,提出了在分子内质子转移后形成不稳定的环状过渡态的观点。在类似条件下,对乳酸的氧化进行了研究。
{"title":"Role of Ethylenediammonium Dichromate in the Kinetic and Mechanistic Analysis of the Oxidation of Glycolic and Lactic Acids in Aqueous AcOH Medium","authors":"H. Jain,&nbsp;P. Kharetiya,&nbsp;D. Panday","doi":"10.1007/s10953-023-01359-z","DOIUrl":"10.1007/s10953-023-01359-z","url":null,"abstract":"<div><p>In aqueous acetic acid medium, the kinetics of oxidation of glycolic and lactic acid by ethylenediammonium dichromate [enH<sub>2</sub>Cr<sub>2</sub>O<sub>7</sub>] have been explored. The oxidation product is the corresponding oxoacid. The conventional UV–vis spectrophotometric method is used to study the reaction kinetics. First-order kinetics has been observed concerning [enH<sub>2</sub>Cr<sub>2</sub>O<sub>7</sub>] and with substrate the order is less than two. The fractional-order dependency with respect to substrate confirms the binding of oxidant and substrate to form a complex before rate-determining step. The rate of reaction increases with an increase in [H<sup>+</sup>] concentration. The existence of primary kinetic isotope effect, <i>k</i><sub>H</sub>/<i>k</i><sub>D</sub> = 5.97 at 298K for glycolic acid (ratio of rate constants for protio- and deuterio-glycolic acid) indicated a C–H bond cleavage rather than C–C bond cleavage. Variation of solvent polarity is found to impose a remarkable impact on the rate of oxidation. From the experimental data, formation of an unstable cyclic transition state followed by intra-molecular proton transfer has been proposed. Under similar conditions oxidation of lactic acid was studied.</p></div>","PeriodicalId":666,"journal":{"name":"Journal of Solution Chemistry","volume":"53 8","pages":"1037 - 1051"},"PeriodicalIF":1.4,"publicationDate":"2024-02-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139766412","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Ternary (Liquid–Liquid) Equilibrium Experiment and Thermodynamic Modeling for Extraction of Phenol from Water with Different Solvents at Several Temperatures 用不同溶剂在不同温度下从水中萃取苯酚的三元(液-液)平衡实验和热力学模型
IF 1.4 4区 化学 Q4 CHEMISTRY, PHYSICAL Pub Date : 2024-02-06 DOI: 10.1007/s10953-023-01340-w

In order to separate phenol from water, at 101.3 kPa, the liquid-liquid equilibria (LLE) data of water + phenol + solvents (trichloromethane, isoamyl alcohol) were obtained at 298.15, 303.15, and 313.15 K. The ability of the extractant to extract phenol from water was evaluated by the distribution coefficient (D) and selectivity coefficient (S). The Bachman and Hand equations were used to verify the reliability of the LLE data with the linear coefficient was greater than 0.98%. The LLE data was correlated with the NRTL and UNIQUAC models to obtain a binary interaction parameter with an RMSD not greater than 0.36%.

为了从水中分离苯酚,在101.3 kPa下,分别在298.15、303.15和313.15 K获得了水+苯酚+溶剂(三氯甲烷、异戊醇)的液液平衡(LLE)数据。巴赫曼方程和汉德方程用于验证 LLE 数据的可靠性,其线性系数大于 0.98%。将 LLE 数据与 NRTL 和 UNIQUAC 模型相关联,得到二元交互作用参数,其 RMSD 不大于 0.36%。
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引用次数: 0
Solubility of Four DL-Amino Acids at Nine Equidistant Temperatures in Aqueous Mixtures of Dipolar Aprotic N,N-Dimethylformamide and the Solution Thermodynamics 四种 DL-氨基酸在 N,N-二甲基甲酰胺双极性丙烯酸水性混合物中九个等温条件下的溶解度及溶液热力学
IF 1.4 4区 化学 Q4 CHEMISTRY, PHYSICAL Pub Date : 2024-02-04 DOI: 10.1007/s10953-023-01353-5

The solubilities of the α-amino acids; DL-Tyrosine, DL-Leucine, DL-Isoleucine and DL-Threonine in six compositions of the binary mixture of pure water and dipolar aprotic N,N-dimethylformamide are evaluated by applying ‘analytical gravimetric’ method at nine equidistant temperatures in the range of 278.15 K to 318.15 K under 0.1 MPa pressure. Powder X-Ray diffraction and thermogravimetric analysis are performed to investigate solvate formation in saturated solutions. The equilibrium solubility values are compared with other literature and discussed. The variation of experimental solubility values in all compositions of such binary solvent mixtures at the experimental nine different temperatures are analysed in the light of chemical interactions involved. The standard molar dissolution Gibbs free energy, enthalpy and entropy are computed using the van’t Hoff analysis. The computed values of the same indicate that the process is endothermic. The standard molar Gibbs free energy as controlled by chemical, hydrophilic and hydrophobic interactions, imparts dissolution of the amino acids in the order, DL-Thr > DL-Ile > DL-Leu > DL-Tyr, as induced by the significant roles of side chains of such amino acids.

在 0.1 兆帕压力下,采用 "分析重量法",在 278.15 K 至 318.15 K 范围内的九个等距温度下,评估了α-氨基酸(DL-酪氨酸、DL-亮氨酸、DL-异亮氨酸和 DL-苏氨酸)在纯水和双极性无相平衡的 N,N-二甲基甲酰胺二元混合物的六种成分中的溶解度。粉末 X 射线衍射和热重分析用于研究饱和溶液中溶解物的形成。平衡溶解度值与其他文献进行了比较和讨论。根据所涉及的化学作用,分析了在实验的九个不同温度下,这种二元溶剂混合物的所有组成中实验溶解度值的变化。采用范特霍夫分析法计算了标准摩尔溶解吉布斯自由能、焓和熵。计算值表明,该过程是内热过程。标准摩尔吉布斯自由能受化学、亲水和疏水相互作用的控制,使氨基酸按照 DL-Thr > DL-Ile > DL-Leu > DL-Tyr 的顺序溶解,这是由这些氨基酸侧链的重要作用引起的。
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引用次数: 0
Liquid–Liquid Equilibrium for the Ternary System of Water, Methyl Acrylate, and Different Solvents at 303.2 K under 101.3 kPa 水、丙烯酸甲酯和不同溶剂三元体系在 303.2 K 和 101.3 kPa 下的液液平衡
IF 1.4 4区 化学 Q4 CHEMISTRY, PHYSICAL Pub Date : 2024-01-26 DOI: 10.1007/s10953-023-01349-1

Methyl acrylate has a wide range of uses, but the production process usually produces aqueous by-products. In this study, four commonly used alcohols (1-pentanol, 1-hexanol, 1-heptanol, and 1-octanol) were selected as extractants to explore the liquid–liquid extraction behavior of water + methyl acrylate + extractants. Through the analysis of partition coefficient (D) and separation coefficient (S), it is found that the data of all systems are greater than 1, indicating that all four alkyl alcohols can well separate methyl acrylate from aqueous solution, and 1-octanol is the best. In addition, the consistency between the binary interaction parameters of regression and tie-line data was tested using Matlab tools, proving that the obtained parameters have good consistency.

丙烯酸甲酯用途广泛,但在生产过程中通常会产生水性副产物。本研究选择了四种常用的醇类(1-戊醇、1-己醇、1-庚醇和 1-辛醇)作为萃取剂,探讨了水 + 丙烯酸甲酯 + 萃取剂的液液萃取行为。通过对分配系数(D)和分离系数(S)的分析,发现所有体系的数据均大于 1,表明四种烷基醇都能很好地从水溶液中分离出丙烯酸甲酯,其中 1-辛醇的分离效果最好。此外,还利用 Matlab 工具测试了回归数据和平线数据的二元相互作用参数之间的一致性,证明所获得的参数具有良好的一致性。
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引用次数: 0
期刊
Journal of Solution Chemistry
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