分隔壁塔精馏分离混合醇的结构设计和优化

Structural Design and Optimization of Rectification Separation of Mixed Alcohol by Using DWC

为完善合成气制低碳醇工艺,以中试级别产量为基础,采用先脱水后精馏分离醇的工艺路线,应用Aspen Plus模拟软件,对混合醇物系的精馏分离的稳态过程进行了模拟研究。采用分隔壁塔技术和双效精馏分离组分物系,对整个过程进行优化:发现分隔壁塔中有4个参数存在最佳范围,对剩余3个参数以年费用最小为目标函数进行优化;通过模拟计算,对比了双效精馏的各种压力组合方式,并找到最优组合为逆流型低压-常压组合;将整个工艺和传统多塔分离序列进行了对比,该工艺能耗为多塔序列能耗的51.4%。

In order to improve and perfect the process of higher-alcohol synthesis from syngas,the paper was based on the pilot scale yield and utilized the technology in which dehydration and rectification separation were conducted sequentially to obtain mono alcohols. With the simulation software Aspen Plus,comprehensively studied the steady-state process design.Dividing wall column and double-effect distillation were used to optimize this process： there were four operating parameters that had the best range and the remaining three parameters were optimized with minimized TAC as the target function. Through the simulation calculation,compared several stress combinations of double-effect rectification,the best one was found：counter-current low pressure-atmospheric pressure combination. The comparison was made between this process and the traditional multi tower process,and the energy consumption of this process was 51.4% that of multi tower series.