甲苯歧化装置热高压分离工艺研究及工业应用

针对目前国内甲苯歧化装置反应产物气液分离过程普遍采用冷高压分离工艺导致装置用能不合理的现状，分析了热高压分离工艺的技术先进行以及装置改造成热高压分离工艺需要注意的问题；确定了能够准确分析甲苯歧化反应产物的分析方法及产物组成，利用ASPEN PLUS流程模拟软件分别对热高压分离工艺过程和冷高压分离工艺过程进行了模拟计算与对比，模拟计算结果表明，由冷高压分离工艺改成热高压分离工艺后对循环氢纯度几乎没有影响。通过热量核算，提出了基于热高压分离工艺的甲苯歧化装置新型换热流程。装置按照新流程改造后，装置运行平稳，工业应用结果表明采用该技术后可使1450kt/a的甲苯歧化装置单位能耗下降5.6kg EO/t，证明热高压分离工艺是可行的及新型换热工艺流程的节能优越性。

Study and application of hot high-pressure technology in toluene disproportionation complex

Cold high-pressure separation technology which resulted to the increase of energy consumption of toluene disproportionation complex was now widely used in toluene disproportionation complex reaction production separation process in China.The technology advance and the problems needed to be noticed when using hot high-pressure separation technology were analyzed.An accurate method for the determination of reaction production was established,and composition of reaction production was determined.The hot high-pressure separation process and cold high-pressure separation process were simulated separately with ASPEN PLUS,and the results indicated that recycle hydrogen concentration was almost not changed compared to cold high-pressure separation technology.A new technological process of toluene disproportionation complex based on hot high-pressure separation technology was developed by thermal equilibrium.After renovation,the unit runned smoothly,and the industrial application results proved that the unit energy consumption of toluene disproportionation complex could be decreased by 5.6kg EO/t for the complex of 1450kt/a.Therefore,the hot high-pressure separation technology was feasible and the new technological process was of energy saving advantages.