文献类型：期刊文献

中文题名：基于离子液体的N,N-二甲基乙酰胺回收工艺

英文题名：Dimethylacetamide recovery process based on ionic liquids

作者：秦磊[1,2];胡汉君[3];魏朋正[1];陈亮[1];漆志文[2]

机构：[1]中国石油化工股份有限公司上海石油化工研究院绿色化工与工业催化国家重点实验室,上海201208;[2]华东理工大学化工学院化学工程联合国家重点实验室,上海200237;[3]华东理工大学化工学院上海市多相结构材料化工重点实验室,上海200237

年份：2019

卷号：38

期号：9

起止页码：3962

中文期刊名：化工进展

外文期刊名：Chemical Industry and Engineering Progress

收录：CSTPCD;;EI(收录号：20194407604874);Scopus;北大核心:【北大核心2017】；CSCD:【CSCD2019_2020】；

语种：中文

中文关键词：N,N-二甲基乙酰胺;离子液体;萃取;精馏;COSMO-RS

外文关键词：dimethylacetamide;ionic liquid;extraction;distillation;COSMO-RS

摘要：针对N,N-二甲基乙酰胺(DMAC)水溶液回收,研究和开发了以离子液体(IL)为萃取剂的萃取-精馏技术。通过COSMO-RS对384种IL组合在无限稀释条件下对DMAC的溶解能力C进行量化预测,优化获得了潜在的1-丁基-3-甲基咪唑三(五氟乙基)三氟磷酸[BMIm]FEP萃取剂。计算了[BMIm]FEP-DMAC-H2O三元体系的液液相平衡数据,并通过NRTL方程拟合获得了二元交互参数,设计了萃取流程。研究结果表明:在DMAC初始含量为10%、[BMIm]FEP/DMAC水溶液质量比为2∶1、萃取塔理论板为20块时,可以回收水溶液中99.5%的DMAC。为进一步评价[BMIm]FEP作为萃取剂的可行性,对工艺进行了能耗计算,同时对比了纯精馏工艺和以氯仿为萃取剂的萃取-精馏工艺,结果表明,以[BMIm]FEP为萃取剂的萃取-精馏工艺更为节能,分别较前两者工艺节能90%和50%以上,在处理低浓度DMAC水溶液时,具有明显的优势。
Focused on the recovery of dimethylacetamide (DMAC) from water, extraction-distillation method using ionic liquids as extractant was investigated and developed. First, solvent capacitys of DMAC with 384 types of ionic liquids at infinite dilution were calculated by COSMO-RS. After optimizing the structure of cations,[BMIm]FEP was finally determined as potential extractant. Then, the liquid-liquid phase equilibrium data of [BMIm]FEP-DMAC-H2O were obtained, and binary interaction parameters were subsequently correlated by NRTL. Based on the binary interaction parameters, extraction process was designed by Aspen Plus. The designed result illustrated that when the initial concentration of DMAC was 10%, the mass ratio of [BMIm]FEP/water solution with DMAC was 2, and the number of theoretical plates reached 20, the recovery ratio of DMAC from water will be more than 99.5%. Finally, in order to evaluate the feasibility for using [BMIm]FEP as extractant, the energy consumption of three types of method were calculated. The result showed that compared with distillation method and the extraction-distillation method with chloroform, the energy cost of extraction-distillation method with [BMIm]FEP as extractant reduced 90% and 50%, respectively. It meant that the method was the most energy saving and the ionic liquid [BMIm]FEP showed its advantage for using as extractant to recover DMAC with low concentration from water.