甲基叔丁基醚合成反应的热力学预测及分析

Thermodynamic Calculation and Analysis of the Synthesis of MTBE

针对甲醇和异丁烯反应体系的气相反应进行了热力学预测和分析，该体系存在四个 独立的化学反应：甲醇与异丁烯的醚化反应、异丁烯的二聚反应、甲醇的脱水反应及异丁 烯的水合反应．对于该复杂反应体系建立了相应的热力学模型和计算方法．考察了温度、 压力、进料烯／醇比及原料中水含量对平衡组成的影响．计算结果表明：在热力学上合成甲 基叔丁基醚（ＭＴＢＥ）较其它反应并不占优势，只有在低温下才能获得较高的ＭＴＢＥ收率． 进料异丁烯/甲醇比对于合成ＭＴＢＥ反应存在一最佳比值，为１．０左右．原料中含有一定的 水对于ＭＴＢ巴的合成有利．压力提高可增力。ＭＴＢＥ收率；并抑制甲醇的脱水反应．

The thermodynamic calculation and analysis was made in the gaseous reaction system of methanol and isobutene. There are four independent chemical reactions in this system, such as: etherification of methanol and isobutene, dimerization of isobutene, dehydration of methanol and hydration of isobutene. The thermodynamic model and calculation method of the complex system was set up. The effect of temperature, pressure, isobutene/methanol ratio, and water concentration in the feed stream on the equilibrium composition was also studied. The results were as follows :1 ) The synthesis of MTBE is no more dominant than other reactions, and high MTBE yield cannot be obtained unless under lower temperature. 2) The optimal isobutene/methanol ratio is about 1. 3) Some water in the feed stream is favorable to the synthesis of MTBE. 4) The increase of pressure can improve the yield of MTBE, but inhibit dehydration of methanol.