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A resins-neutralization coupled route for the treatment of stainless-steel pickling effluent: A research study 树脂-中和耦合工艺处理不锈钢酸洗废水的研究
IF 1.2 4区 工程技术 Q4 CHEMISTRY, APPLIED Pub Date : 2023-01-01 DOI: 10.2298/ciceq221023007b
L.S. Bhadrinarayanan, C. Anand Babu
One of the major environmental problems caused by stainless-steel industries is the liquid effluents generated during the production processes. It contains a high concentration of metal ions such as Fe (III), Cr (III), Cr (VI), and Ni (II) in HF and HNO3 mixture, oil, and rinse wastewater. The used pickling waste stream has a pH of 0.5, and Total Dissolved Salts (TDS) of 520g/L with a density of 1.20g/CC. The present work focused on the recycling of pickling effluent by applying a combination of filtration, resins, and neutralization for the efficient removal of metal ions and F- greater than 99.5%. Laboratory experiments were performed using micro and ultra-filters with a membrane area of 0.2m2 for the removal of TDS. Cr (VI) was removed using TulsionFSMP 6301 resin and desorption using NaNO3 and subsequent conversion into Na2Cr2O7 as a by-product. For neutralization, Ca(OH)2, NaOH were used to precipitate metal ions and the resulting filtrate was polished using ZrOCl2 for effective removal of F- to 0.12 mg/L. The nitrate was recovered as NaNO3. Adsorption isotherm and kinetic studies were utilised for Cr (VI) from experimental data and a process flow diagram is developed, which can eventually be tested on a larger scale.
不锈钢工业造成的主要环境问题之一是生产过程中产生的废液。在HF和HNO3混合物、油和漂洗废水中含有高浓度的Fe (III)、Cr (III)、Cr (VI)、Ni (II)等金属离子。使用过的酸洗废液pH为0.5,总溶解盐(TDS)为520g/L,密度为1.20g/CC。目前的工作重点是利用过滤、树脂和中和相结合的方法回收酸洗废水,以有效去除金属离子和大于99.5%的F-。采用膜面积为0.2m2的微滤池和超滤池对TDS进行了去除实验。用TulsionFSMP 6301树脂去除Cr (VI),用NaNO3解吸,然后转化为副产物Na2Cr2O7。中和用Ca(OH)2、NaOH沉淀金属离子,用ZrOCl2抛光滤液,F-的有效去除率达到0.12 mg/L。硝酸被回收为NaNO3。利用实验数据对Cr (VI)进行了吸附等温线和动力学研究,并绘制了工艺流程图,最终可以在更大规模上进行测试。
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引用次数: 0
Optimization and effect of dielectric fluid with Zr and Ni on electrical discharge machining of die steel material 含Zr和Ni介质对模具钢材料电火花加工的优化及影响
IF 1.2 4区 工程技术 Q4 CHEMISTRY, APPLIED Pub Date : 2023-01-01 DOI: 10.2298/ciceq221215005a
Srinivasan Appadurai, Saravanan Ganesan, Viswanathan Rangasamy, Karthikeyan Kanakasabapathi
This present work is aimed to optimize the machining parameters and study the effect of powder mixed dielectric fluid on EDM process. TOPSIS method of optimization is adopted to identify the optimal machining parameters. HCHCr die steel is preferred as machining material. Ni, Zr and Ni+Zr were selected as powder inclusion in dielectric fluid due to hard and ductile nature. L9 array Taguchi DOE is preferred to perform the experiments with parameters like peak off time, pulse off time and pulse current. TOPSIS study revealed that, third level of powder dielectric fluid (Ni+Zr), 7A peak current, 9 ?s pulse on time and 2 ?s pulse off time were specified as optimal condition. Pulse on time (Ton) was having high impact on MRR and Ra while performing machining operation on HCHCr die steel. SEM analysis was done to find the effect of powder mixed dielectric fluid while EDAX analysis was done to ensure the presence of powder inclusion.
本文旨在优化加工参数,研究粉末混合介质对电火花加工的影响。采用TOPSIS优化方法确定最优加工参数。首选HCHCr模具钢作为加工材料。介电流体的粉末包裹体选择Ni、Zr和Ni+Zr,因为它们具有较强的硬度和延展性。L9阵列田口DOE优先采用峰值关闭时间、脉冲关闭时间和脉冲电流等参数进行实验。TOPSIS研究表明,粉末介电流体(Ni+Zr)为3级,峰值电流为7A,脉冲开启时间为9 s,脉冲关闭时间为2 s为最佳条件。在对HCHCr模具钢进行加工时,脉冲准时(Ton)对MRR和Ra有较大的影响。通过SEM分析粉末混合介质的影响,EDAX分析粉末夹杂物的存在。
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引用次数: 0
The effect of metal-titania interaction on photodegradation in SBA-15-supported metal-titania photocatalysts 金属-二氧化钛相互作用对sba -15负载型金属-二氧化钛光催化剂光降解的影响
IF 1.2 4区 工程技术 Q4 CHEMISTRY, APPLIED Pub Date : 2023-01-01 DOI: 10.2298/ciceq221017001g
S. Göl, Elif Akbay
Several transition metals (Fe, Cu, Ni, Cr, and Co) were inserted into the Ti-SBA-15 using two-step synthesis methods. XRD, SEM-EDX, N2 adsorption-desorption isotherms, XRF, and UV-DRS analysis were used for characterizations. The results confirm the preservation of an ordered mesoporous structure and well-dispersed Ti-metal, and enhanced the absorption of light compared with Ti-SBA-15. The photocatalytic performances were evaluated in the degradation of methylene blue under UV light. The results show that the Co-Ti-SBA-15 exhibited the highest photocatalytic activity among the prepared photocatalysts for the degradation of methylene blue. The significant activity increase might be attributed to the increased reactant adsorption by the mesoporous structure of SBA-15, the good distribution of TiO2 in the pores of SBA-15, and the increased electron transfer mobility due to metal doping. In addition to efficiency, Co-Ti-SBA-15 is a suitable catalyst for dye degradation, exhibiting good stability in methylene blue degradation over five photocatalytic runs without any deviation of the structure.
采用两步合成方法将几种过渡金属(Fe, Cu, Ni, Cr和Co)插入Ti-SBA-15中。采用XRD、SEM-EDX、N2吸附-解吸等温线、XRF和UV-DRS分析进行表征。结果证实,与Ti-SBA-15相比,该材料保留了有序的介孔结构和分散良好的金属钛,并增强了光吸收。考察了紫外光对亚甲基蓝降解的光催化性能。结果表明,在所制备的光催化剂中,Co-Ti-SBA-15对亚甲基蓝的降解具有最高的光催化活性。SBA-15的介孔结构增加了对反应物的吸附,TiO2在SBA-15的孔隙中分布良好,金属掺杂提高了电子转移迁移率,这可能是SBA-15活性显著提高的原因。除了效率外,Co-Ti-SBA-15是一种适合染料降解的催化剂,在五次光催化运行中,亚甲基蓝降解表现出良好的稳定性,没有任何结构偏差。
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引用次数: 0
Optimization of energy consumption during immersion frying of peanuts 花生浸炸过程能耗的优化
IF 1.2 4区 工程技术 Q4 CHEMISTRY, APPLIED Pub Date : 2023-01-01 DOI: 10.2298/ciceq230116018d
D. Doder, D. Djakovic, B. Stepanov, Nikola Milivojevic
The objective of this study was to investigate the influence of different regimes of immersion batch frying of peanuts on its specific energy consumption. The investigation was conducted via simulation, where energy consumption was calculated using various heat power / peanut mass ratios. As the result of the applied optimization procedure within the examined domain and calculation data, it estimated that regime where 24 kW of heating power and 28.6 kg of peanuts were involved gave the minimum specific energy consumption. Besides that, the resulting surface could serve as a basis for designing and operating the frying equipment in more favorable regimes in terms of energy efficiency.
本研究旨在探讨花生浸泡分批油炸不同工艺条件对其比能量消耗的影响。调查通过模拟进行,其中使用不同的热功率/花生质量比计算能耗。根据所检查区域内应用的优化程序和计算数据,估计24 kW加热功率和28.6 kg花生所涉及的制度给出了最小的比能耗。此外,所得到的表面可以作为在更有利的能源效率制度下设计和操作油炸设备的基础。
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引用次数: 0
The influence of moisture content on drilled cuttings’ properties of bed packing and flowability 含水率对钻屑床层充填性能和流动性的影响
IF 1.2 4区 工程技术 Q4 CHEMISTRY, APPLIED Pub Date : 2023-01-01 DOI: 10.2298/ciceq230424023a
H. Altino, G. Lourenço, C. Ataíde, C. Duarte
To design and operate various equipment of the solids control system in offshore drilling platforms, it is important to establish how the moisture content influences the characteristics of drilled cuttings to form packed beds and flow over solid surfaces. The current study provides a comprehensive analysis of how moisture content, primarily composed of water and representing Water-based muds (WBMs), influences the properties of bed packing and flowability of drilled cuttings. The particle aggregation/disaggregation dynamics, loose and tapped bulk densities and porosities, compaction dynamics of packed beds, Hausner ratio, and angle of repose of drilled cuttings with ten distinct moisture contents (1.4-44.0 wt%) were analyzed. It was noticed that the increment of moisture content up to 15.2% promoted the formation of looser interparticle structures. However, these structures were steadier, showing greater difficulty to flow and release air/liquid. The continuous increment of moisture content beyond 15.2%, promoted a complete change in the material behavior. The interparticle structures became denser. The material could flow and release air/liquid more easily. In addition, it was possible to establish a classification of the different behaviors of drilled cuttings according to the moisture content. Predictive models were proposed to describe the influence of the moisture content on the bed packing and flowability properties of drilled cuttings.
为了设计和操作海上钻井平台固控系统的各种设备,确定含水率如何影响钻井岩屑形成充填层并在固体表面上流动的特性是很重要的。目前的研究全面分析了含水率(主要由水组成,代表水基泥浆(wbm))如何影响床层填料的性质和钻屑的流动性。分析了10种不同含水率(1.4-44.0 wt%)的钻屑的颗粒聚集/分解动力学、松散和松散的体积密度和孔隙率、充填层的压实动力学、豪斯纳比和休止角。当含水率增加到15.2%时,颗粒间结构的形成更加松散。然而,这些结构更稳定,表现出更大的流动和释放空气/液体的困难。含水率持续增加超过15.2%,促进了材料性能的完全改变。粒子间结构变得更加密集。这种材料可以更容易地流动和释放空气/液体。此外,还可以根据含水率对钻出岩屑的不同行为进行分类。提出了描述含水率对岩屑床层充填和流动特性影响的预测模型。
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引用次数: 0
Eco-friendly coatings composed of lignosulfonate-modified biopolymer and vegetable waxes for nitrogenous fertilizers 由木质素磺酸改性生物聚合物和植物蜡组成的氮肥环保型涂料
IF 1.2 4区 工程技术 Q4 CHEMISTRY, APPLIED Pub Date : 2023-01-01 DOI: 10.2298/ciceq230214019k
Aysu Kayalıoğlu
Fertilizer coatings are seen as mandatory to protect the physical quality of fertilizer granules and they continue to be developed due to compliance with novel fertilizer types and most importantly with future regulations in environment and animal-plant health. As known, the bio-based contents are sustainable and eco-friendly compared to petroleum-based materials. However, there are common many types of coatings composed of unsustainable, costly and can be ecologically toxic contents such as paraffine or mineral oil. In this article, a comparative research study is presented to provide eco-friendly anticaking coatings composed of lignosulfonate-modified biopolymer and vegetable waxes instead of the conventional coatings. The main purpose of this research is to find out the alternative ingredients instead of a petroleum-derivatives in the conventional coatings. According to the results, anticaking coating containing lignosulfonate modified biopolymer showed improvements on granule structure of calcium ammonium nitrate fertilizer and showed the best anticaking performance compared to other coating types. Vegetable-based coatings, on the other hand, gave results in appropriate intervals, especially at low concentrations, and showed a valuable way to develop better versions in future studies. As a result, it is seen that biopolymers can replace paraffin-based products.
肥料涂层被视为保护肥料颗粒物理质量的强制性措施,由于符合新型肥料类型,最重要的是符合未来环境和动植物健康法规,肥料涂层将继续发展。众所周知,与石油基材料相比,生物基材料具有可持续性和环保性。然而,常见的许多类型的涂料由不可持续的、昂贵的和可能具有生态毒性的内容物组成,如石蜡或矿物油。本文对木质磺酸改性生物聚合物与植物蜡组成的环保防结块涂料替代传统涂料进行了比较研究。本研究的主要目的是寻找替代传统涂料中石油衍生物的替代成分。结果表明,木质素磺酸盐改性生物聚合物防结块涂层改善了硝酸铵钙肥料的颗粒结构,与其他类型的涂层相比,具有最佳的防结块性能。另一方面,植物基涂层在适当的时间间隔内给出了结果,特别是在低浓度下,并且在未来的研究中显示了开发更好版本的有价值的方法。由此可见,生物聚合物可以取代石蜡基产品。
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引用次数: 0
Internal model control of cumene process using analytical rules and evolutionary computation 基于解析规则和进化计算的异丙烯过程内模控制
IF 1.2 4区 工程技术 Q4 CHEMISTRY, APPLIED Pub Date : 2023-01-01 DOI: 10.2298/ciceq220711014m
Vinila Mundakkal Lakshmanan, Aparna Kallingal, Sreepriya Sreekumar
Cumene is used as precursor for production of many organic chemicals and as thinner in paints & lacquers. Its production process involves one of the large-scale manufacturing processes with complex kinetics. Different classical control strategies have been implemented and compared for the cumene reactor in this process. As a system with large degrees of freedom a novel approach for extracting the state space model from the COMSOL Multiphysics implementation of the system is adopted here. Internal Modern Control (IMC) based PI and PID controllers are derived for the system. To derive the controller setting the system is reduced to the FOPDT and SOPDT model structure using Skogestad half rules. The integral time is modified to obtain the excellent set point tracking and faster disturbance rejection. From the analysis it can be stated that PI controller suits more for this specific process. Particle Swarm Optimization (PSO) algorithm, an evolutionary computation technique is also used to tune the PI settings. The PI controllers with IMC, Zeigler Nichols and PSO tuning are compared and it can be concluded that PSO PI controller settles at 45s without any oscillations and settles down faster for the disturbance of magnitude 0.5 applied at t=800s, through it is computationally intensive compared to other controller strategies.
异丙苯被用作生产许多有机化学品的前体,也被用作油漆和漆的稀释剂。其生产过程涉及复杂动力学的大规模制造过程之一。在此过程中对异丙烯反应器采用了不同的经典控制策略并进行了比较。作为一个大自由度系统,本文采用了一种新的方法从系统的COMSOL Multiphysics实现中提取状态空间模型。提出了基于PI和PID控制器的内部现代控制(IMC)。利用Skogestad半规则将系统简化为FOPDT和SOPDT模型结构,推导出控制器的整定值。对积分时间进行了修正,获得了良好的设定值跟踪和更快的抗干扰能力。从分析可以看出,PI控制器更适合这一特定过程。粒子群优化(PSO)算法,一种进化计算技术,也用于调整PI设置。比较了具有IMC、Zeigler Nichols和PSO整定的PI控制器,可以得出结论,PSO PI控制器在45秒稳定,没有任何振荡,并且在t=800s施加0.5量级的扰动时稳定得更快,因为与其他控制器策略相比,它的计算量很大。
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引用次数: 0
Process modeling and kinetic estimation for desulfurization of diesel fuel using nano - ZnO/Al2O3 纳米ZnO/Al2O3脱硫柴油过程建模及动力学估计
IF 1.2 4区 工程技术 Q4 CHEMISTRY, APPLIED Pub Date : 2023-01-01 DOI: 10.2298/ciceq230208020h
Jasim I. Humadi, M. Shihab, Ghazwan S. Ahmed, Mustafa A. Ahmed, Zeyad Abdullah, Shankar Sehgal
In the present paper, a gamma alumina (?-Al2O3) loaded zinc oxide (ZnO) nano-catalyst (ZnO/?-Al2O3) has been synthesized and used to accelerate the removal of sulfur compounds from light gas oil by oxidative desulfurization (ODS) process. The synthesized nano-catalysts have been characterized by atomic force microscopy (AFM) and Brunauer-Emmett-Teller (BET). The ODS process has been conducted in batch reactor at various reaction temperatures and batch times varying between 30 to 90?C and 20 to 80 min respectively. DBT removal was highest (93.781%) while using synthesized nano-catalyst (9% ZnO/?-Al2O3) at 90?C and 80 min reaction time. A new mathematical modeling technique has been then performed for the ODS operation under mild experimental conditions in order to evaluate the most appropriate kinetic variables for the new synthesized nano-catalysts based on the obtained experimental data. Simulation results indicate a high good match with experimental observations with less than 5% absolute average error for all runs. The optimization procedure of the process condition displays that > 98% DBT could be eliminated within 200 min, at 87?C in the existence of synthesized nano-catalyst (9% ZnO/?-Al2O3).
本文合成了一种负载γ -氧化铝(-Al2O3)的氧化锌(ZnO)纳米催化剂(ZnO/?-Al2O3),并将其用于氧化脱硫(ODS)法加速轻气油中硫化物的脱除。采用原子力显微镜(AFM)和布鲁诺尔-埃米特-泰勒(BET)对合成的纳米催化剂进行了表征。在间歇式反应器中,在不同的反应温度和间歇时间下进行了ODS工艺。C, 20 ~ 80分钟。合成纳米催化剂(9% ZnO/ -Al2O3)在90℃时,DBT去除率最高(93.781%)。C,反应时间80 min。在温和的实验条件下,对ODS操作进行了新的数学建模,以便根据得到的实验数据评估新合成的纳米催化剂的最合适的动力学变量。仿真结果表明,所有运行的绝对平均误差小于5%,与实验结果吻合良好。工艺条件的优化过程表明,在87℃时,在200 min内可消除> 98% DBT。C在存在下合成纳米催化剂(9% ZnO/?-Al2O3)。
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引用次数: 0
The effect of vacuum process on biodiesel production from Palm Kernel Fatty Acid Distillate 真空工艺对棕榈仁脂肪酸馏出物生产生物柴油的影响
IF 1.2 4区 工程技术 Q4 CHEMISTRY, APPLIED Pub Date : 2023-01-01 DOI: 10.2298/ciceq221026012t
R. Tambun, Dwita Burmana, B. Haryanto, V. Alexander
This study aims to examine the operating pressure effect on the manufacture of biodiesel from Palm Kernel Fatty Acid Distillate (PKFAD) by using para-Toluene Sulfonic Acid (PTSA) catalyst. The operating pressures studied are the vacuum pressures of 70 kPa, 80 kPa, 90 kPa, and 100 kPa, which varied with PTSA concentrations of 5%, 10%, 15%, 20%, 25%, and the molar ratios of methanol and PKFAD are 5:1, 6:1, 7:1, 8:1, 9:1, 10:1. Biodiesel production from PKFAD is carried out with reaction duration of 120 minutes and reaction temperature at 50 0C. The amounts of fatty acids converted to biodiesel are calculated based on the initial acid number and the acid number after the esterification reaction. The results obtained show that a vacuum pressure of 70 kPa to 100 kPa provides a conversion above 96% for all catalyst concentrations and all molar ratios of methanol and PKFAD. The highest conversion of PKFAD to biodiesel of 98.6% is obtained at an operating pressure of 80 kPa, a catalyst concentration of 25%, and the molar ratio of methanol and PKFAD is 10:1. The biodiesel characteristics obtained in this study have met the standards of the American Society for Testing Materials.
以对甲苯磺酸(PTSA)为催化剂,研究了操作压力对棕榈仁脂肪酸馏出物(PKFAD)生产生物柴油的影响。操作压力分别为70 kPa、80 kPa、90 kPa、100 kPa,分别随PTSA浓度为5%、10%、15%、20%、25%,甲醇与PKFAD的摩尔比为5:1、6:1、7:1、8:1、9:1、10:1而变化。以PKFAD为原料制备生物柴油,反应时间为120分钟,反应温度为50℃。根据初始酸值和酯化反应后的酸值计算转化为生物柴油的脂肪酸量。结果表明,在70 ~ 100 kPa的真空压力下,甲醇和PKFAD的转化率在96%以上。当操作压力为80 kPa,催化剂浓度为25%,甲醇与PKFAD的摩尔比为10:1时,PKFAD制生物柴油的最高转化率为98.6%。本研究获得的生物柴油特性达到了美国材料测试协会的标准。
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引用次数: 0
Purification local salt in Aceh Timur regency using alkaline (KOH and NaOH) activated bentonite 用碱性(KOH和NaOH)活化膨润土净化亚齐帖木儿地区的食盐
IF 1.2 4区 工程技术 Q4 CHEMISTRY, APPLIED Pub Date : 2023-01-01 DOI: 10.2298/ciceq220922008w
P. Wahyuningsih, Muslimah Muslimah, Yusnawati Yusnawati
The various purification methods have been developed to improve the quality local salt, the NaCl content > 94%. Bentonite is one of materials used as binder impurities in purification. The purpose of the study was to synthesis a modified bentonite using alkaline solution, which includes natrium hydroxide (NaOH) and potassium hydroxide (KOH) with various concentrations (1, 1.5, 2, and 2.5 M) and determined level of Na+, Ca2+ and Mg2+ metals using AAS. The bentonite and activating agent 1 M (1:10) were stirred for three hours. Then, the bentonite was dried for two hours in an oven at 110?C. The activated bentonite was dried for four hours at 170?C. The activated bentonite was characterized using analytical techniques, such as XRD, FTIR, and SEM. The basal spacing d001 on the diffractogram bentonite was significantly unaffected by alkaline activation. FTIR analysis represents the stretching vibration of -OH shifts towards a lower wavenumber. Alkaline activation reduced impurities from bentonite and increase the pore surface's porosity. NaCl levels in people's salt increased after being activated using alkaline. The increase in Na+ levels was followed by decrease content of Ca2+ and Mg2+ metals. KOH-activated bentonite had a higher NaCl level than NaOH-activated bentonite.
开发了多种净化方法,提高了局部盐的质量,NaCl含量达94%。膨润土是提纯杂质时用作粘结剂的材料之一。本研究的目的是用碱溶液合成改性膨润土,碱溶液包括不同浓度(1、1.5、2和2.5 M)的氢氧化钠(NaOH)和氢氧化钾(KOH),并用原子吸收光谱法测定Na+、Ca2+和Mg2+金属的含量。膨润土与活化剂1m(1:10)搅拌3小时。然后,将膨润土在110℃的烤箱中干燥两小时。将活化的膨润土在170℃下干燥4小时。采用XRD、FTIR、SEM等分析技术对活化膨润土进行了表征。衍射图上膨润土的基底间距d001明显不受碱性活化的影响。FTIR分析表明-OH的拉伸振动向较低的波数偏移。碱性活化降低了膨润土中的杂质,增加了孔隙表面的孔隙率。人的食盐经碱性活化后,盐的NaCl含量增加。Na+水平升高后,Ca2+和Mg2+金属含量降低。氢氧化钾活化膨润土的NaCl浓度高于氢氧化钠活化膨润土。
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引用次数: 0
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Chemical Industry & Chemical Engineering Quarterly
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