摘要
Abstract
Vinyl acetate (VAc) was prepared by cracking ethylidene diacetate (EDA) catalyzed by lithium bromide, lithium iodide, benzene sulfonic acid, p-toluenesulfonic acid, HZSM-5 and macroporous cation exchanged resin, respectively, and using the reactive distillation process to improve the yield. The macroporous cation exchanged resin exihibited the best activity, and selecting it as catalyst, the effects of reaction temperature, time, catalyst dosage and feed ratio of Ac 2O to EDA on the reaction were investigated. The optimal process conditions were determined as follows: reaction temperature of 140℃, reaction time of 1.5h, catalyst of 20g and Ac2O/EDA molar ratio of 4. Under above conditions, the EDA conversion, VAc and acetaldehyde selectivities were 59.98%, 45.62%and 54.38%, respectively. A process simulation for the production of vinyl acetate with an annual output of 10,000 tons was carried out by Aspen Plus, and results show that the purity of vinyl acetate product could be up to 99.9% by mass, which meets the design requirements.关键词
二醋酸亚乙酯/醋酸乙烯/反应精馏/催化剂/大孔阳离子交换树脂/流程模拟Key words
ethylidene diacetate/vinyl acetate/reactive distillation/catalyst/macroporous cation exchanged resin/process simulation分类
化学化工
