异丙醇脱水制备丙烯反应热力学分析  

Thermodynamic analysis on dehydration reaction of isopropanol to produce propylene

作　　者：马会霞 周峰 张淑梅 乔凯 MA Hui-xia;ZHOU Feng;ZHANG Shu-mei;QIAO Kai(Dalian Research Institute of Petroleum and Petrochemicals,Sinopec Corp.,Dalian 116045,China)

机构地区：[1]中国石油化工股份有限公司大连石油化工研究院,辽宁大连116045

出　　处：《现代化工》2020年第6期196-198,203,共4页Modern Chemical Industry

基　　金：国家自然科学基金项目(51876200)。

摘　　要：采用吉布斯自由能最小化法,系统探讨了反应温度、压力、原料含水量对异丙醇脱水反应和丙烯二聚副反应的平衡转化率的影响规律。热力学平衡计算结果说明,高温、低压有利于促进异丙醇脱水生成丙烯的目标反应,同时可抑制丙烯二聚生成甲基戊烯的副反应。当反应温度高于300℃时,异丙醇原料的含水量对异丙醇脱水反应平衡转化率的影响可以忽略。因此,采用高温常压异丙醇脱水工艺,在使用耐水蒸汽催化剂的前提下,可采用异丙醇和水共沸物作为原料,可降低原料的获得成本。By using Gibbs free energy minimization method,the influencing rules of reaction temperature,pressure and water content of isopropanol(IPA)on the dehydration of IPA and propylene dimerization side reaction are discussed in detail.Thermodynamic equilibrium calculation result indicates that both high temperature and low pressure are beneficial to promote the target reaction of IPA dehydration to propylene,and can inhibit the side reactions of propylene dimerization to methylpentene.As the reaction temperature exceeds 300℃,the effect of water content of IPA on the equilibrium conversion of IPA dehydration reaction can be ignored.Under the premise of using a water-resistant catalyst,if a high-temperature and normal-pressure isopropanol dehydration process is adopted,isopropanol-water azeotrope can be used as raw materials,which can reduce the cost of obtaining raw materials.

关 键 词：异丙醇 脱水反应 丙烯 热力学 平衡 

分 类 号：TQ013.1[化学工程]