丙烯气相直接环氧化制环氧丙烷反应热力学研究  

Reaction Thermodynamics of Direct Gas-phase Epoxidation of Propylene to Propylene Oxide

作　　者：史建公 焦阳 王赫鹏 苏海霞 张毅 任靖 苑志伟 Shi Jiangong;Jiao Yang;Wang Hepeng;Su Haixia;Zhang Yi;Ren Jing;Yuan Zhiwei(Engineering and Technology Research Institute,SINOPEC Catalyst Co.,Lid.,Beijing 10111;SINOPEC Catalyst Co.,id.,Bejing 100029)

机构地区：[1]中国石化催化剂有限公司工程技术研究院,北京10111 [2]中国石化催化剂有限公司,北京100029

出　　处：《中外能源》2022年第8期59-63,共5页Sino-Global Energy

摘　　要：环氧丙烷是丙烯的重要衍生物之一。到目前为止,由于尚未开发出在合适的工艺条件下具有产业化价值的丙烯直接气相环氧化制环氧丙烷催化剂,该工艺一直未能实现产业化。研究该反应的热力学对于从本质上认识该反应,促进该反应催化剂的开发具有一定的指导意义。通过计算丙烯直接气相环氧化制环氧丙烷体系热力学,对比生成环氧丙烷主反应和完全氧化副反应的热力学参数随温度的变化规律,结果表明,对于主反应而言,反应的吉布斯自由能变化随温度的升高快速增大,但焓变几乎与温度无关;对副反应而言,反应的焓变同样与温度的变化关系不大,但吉布斯自由能随温度的升高呈负增长趋势。这样的变化规律,有利于在工业设计中合理控制反应温度。在热力学研究的基础上,建议加强丙烯直接气相氧化制环氧丙烷低温催化剂及反应器和反应工艺开发。Propylene oxide is one of the important derivatives of propylene.Due to the lack of catalysts for direct gas-phase epoxidation of propylene to propylene oxide with commercialization value under suitable pro-cess conditions,this process has not been commercialized so far.The study on the thermodynamics of the re-action has guiding significance for essentially understanding the reaction and promoting the development of catalysts for the reaction.The thermodynamics of direct gas-phase epoxidation of propylene to propylene oxide system is calculated to compare the variation of thermodynamics parameters with temperature for the main re-action of propylene oxide production and the complete oxidation side reaction.The results show that for the main reaction,the Gibbs free energy change of reaction increases rapidly with the temperature increase,but the enthalpy change is almost independent of the temperature.For the side reaction,the enthalpy change of reaction also has little to do with the temperature change,but the Gibbs free energy increases negatively with the temperature increase.This rule is beneficial to the reasonable control of reaction temperature in industrial design.Based on the thermodynamics study,it is suggested that the development of low temperature catalyst,reactor and reaction process for direct gas-phase epoxidation of propylene to propylene oxide should be strengthened.

关 键 词：环氧丙烷 丙烯气相环氧化 丙烯氧化 丙烯 热力学 

分 类 号：TQ223.26[化学工程—有机化工]