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.

马会霞(1987-),女,硕士,工程师,研究方向为低碳烃综合利用,mahuixia.fshy@sinopec.com