化学工程2023，Vol.51Issue(12)：15-19,55,6.DOI:10.3969/j.issn.1005-9954.2023.12.004
精馏-熔融结晶耦合分离乙二醇-碳酸乙烯酯
Separation of ethylene glycol and ethylene carbonate by distillation and melt crystallization
林杰 1仇玉静 1刘畅 1罗国华 2戴晓兵3
作者信息
- 1. 北京石油化工学院 新材料与化工学院,北京 102617
- 2. 北京石油化工学院 新材料与化工学院,北京 102617||燃料清洁化及高效催化减排技术北京市重点实验室,北京 102617
- 3. 珠海市赛纬电子材料股份有限公司,广东珠海 519000
- 折叠
摘要
Abstract
EC(ethylene carbonate)was produced in Ca-Zn composite oxide catalytical alcoholysis process using urea and EG(ethylene glycol)as raw materials,and the crude product was separated by distillation-melt crystallization method.An efficient separation process was developed by studying the effects of distillation,crystallization final temperature,sweating final temperature and crystal seed.As a result,optimal technological conditions to refine EC from EC-EG system is acquired and they are listed as follows.Initially,the remaining catalyst in the crude product is removed by flash evaporation.Then the byproduct(2-oxazolidone)is removed by preliminary distillation and the product with EC mass fraction at 80％ is collected for further refinement.The melting crystallization is employed to thoroughly separated EC from this product and the optimized operations are listed as follows.It is kept at 34 ℃ for 20 min and then cooled down to 30 ℃ at 0.05 ℃/min.Subsequently,pure EC seed is added to start slow crystallization.The whole crystallization procedure is conducted at 16 ℃ for 20 min and the EC crystals are separated from mother liquor for final refinement.Purification for these crystals reaches to 95.49％ by sweating.It is conducted at 32 ℃ for 20 min after the temperature rising from 16 ℃ to 32 ℃ at 0.05 ℃/min.Finally,the purity of EC is increased to more than 99.9％ after purification in distillation tower under high reflux-ratio operation.关键词
乙二醇/碳酸乙烯酯/分离/蒸馏/熔融结晶Key words
ethylene glycol/ethylene carbonate/separation/distillation/melt crystallization分类
化学化工引用本文复制引用
林杰,仇玉静,刘畅,罗国华,戴晓兵..精馏-熔融结晶耦合分离乙二醇-碳酸乙烯酯[J].化学工程,2023,51(12):15-19,55,6.
