化工学报2019，Vol.70Issue(2)：670-677,8.DOI:10.11949/j.issn.0438⁃1157.20181052
萃取精馏生产高纯度环氧丙烷的工艺研究
Extractive refining process for production of propylene oxide with high purification
摘要
Abstract
Crude propylene oxide (PO) produced from propylene epoxidation contains contaminations such as acetaldehyde, methanol, methyl formate, water and so on. It is difficult to remove them by using simple distillation because the relative volatilities of these components to PO are close to 1. Meanwhile, the PO is easy to react with water and 1, 2-propanediol (PG) that will affect the extractive efficiency is then produced. Therefore, a process flowsheet combined extractive distillation and liquid-liquid extraction is proposed here to effectively remove these contaminations and improve PO product yield, in which the PO hydrolysis reaction (non-catalytic reactive distillation) and the processes of water washing for PO recover and side-drawing for the removal of PG are considered. The whole process is then simulated by using process simulation software Aspen Plus, in which the NRTL thermodynamic model is employed to character the thermodynamic properties. The effects of major design parameters of the separation process, such as the solvent ratio, the theoretical stage number of extractive distillation column, the location of feed, and the temperature of solvent, are investigated. The results show that the process is reasonable, reliable, and economical superior to existing processes, which can guide industrial process design and operation optimization.关键词
环氧丙烷/萃取精馏/共沸混合物/分离/优化设计Key words
propyleneoxide/ extractive distillation/ azeotrope/ separation/ optimal design分类
化学化工引用本文复制引用
胡松,李进龙,李木金,杨卫胜..萃取精馏生产高纯度环氧丙烷的工艺研究[J].化工学报,2019,70(2):670-677,8.基金项目
国家自然科学基金项目(21878025) （21878025）
