MTO脱甲烷塔分离过程模拟及优化  

Simulation and optimization of MTO demethanizer separation process

作　　者：张少石[1] 陈晓蓉[1,2] 梅华[1,2] 董巍巍 

机构地区：[1]南京工业大学化学化工学院,江苏南京210009 [2]南京(诺盟化工)催化氢化工程技术研究中心,江苏南京210009 [3]中国建筑中建安装工程有限公司,江苏南京210046

出　　处：《化工进展》2014年第5期1093-1100,共8页Chemical Industry and Engineering Progress

基　　金：江苏省科技厅产学研前瞻项目(BY2012033)

摘　　要：采用Aspen Plus流程模拟软件对1800kt/a MTO装置的中冷脱甲烷塔分离过程进行模拟和优化。选用RK-SOVE状态方程和RadFrac模块进行计算并与实际工况进行对比,验证了模型的可靠性。并对进料位置、中间冷却器位置和处理量进行灵敏度分析,着重考察了吸收剂使用量及其组成对分离效果的影响。模拟结果表明,预切割-脱甲烷工艺虽然在降低乙烯损失和吸收剂用量方面对吸收-脱甲烷工艺进行了改进,但是综合效果并不明显。灵敏度分析显示除预切割-脱甲烷工艺的吸收剂用量外,其余考察变量均存在最优值。A demethanizer separation process under the condition of propylene as refrigerant for 1800kt/a methanol to olefin（MTO） unit was simulated and optimized using Aspen Plus software. It was calculated and compared with actual operation conditions by using RK-SOVE practical state equation and RadFrac module. The reliability of the model was verified. It was made a sensitivity analysis for feeding location , intercooler location and handling capacity , and emphatically investigated the influence of absorbent flowrate and its components on the separation efficiency. The results showed that the comprehensive effects of precut-demethanizer process were not obvious,although it improved the absorption-demethanizer process on the aspect of reducing ethylene loss and absorbent dosage. Sensitivity analysis showed that the optimal values existed for the examined variables except absorbent dosage of precut-demethanizer process.

关 键 词：甲醇制烯烃 脱甲烷塔 分离 模拟 吸收 

分 类 号：TQ221.21[化学工程—有机化工]