四氢呋喃-乙醇变压精馏分离  

Pressure-swing distillation separation of tetrahydrofuran-ethanol azeotrope

作　　者：纪智玲[1] 王志恒[1] 李文秀[1] 于三三[1] 张志刚[1] 李双明[1] 范俊刚[1] 张弢[1] 

机构地区：[1]沈阳化工大学辽宁省化工分离技术重点实验室,辽宁沈阳110142

出　　处：《化学工程》2014年第10期20-24,共5页Chemical Engineering(China)

摘　　要：共沸混合物分离是化工过程中常见的分离难题。变压精馏是根据物系压力改变而使液体混合物共沸点组成发生变化,进而使共沸物系得以分离的一种有效分离方法。在热力学分析基础上,提出了四氢呋喃-乙醇液体混合物变压精馏分离双塔工艺流程。以NRTL-RK为物性计算方法,利用Aspen Plus模拟软件对变压精馏分离工艺过程进行分析及模拟,并对工艺参数进行优化。研究结果表明:在常压塔和0.8 MPa高压塔组成的双塔流程中变压精馏可将四氢呋喃-乙醇最低共沸混合物进行较好的分离。Azeotrope separations are tough issues commonly confronted in chemical processes. Pressure-swing distillation （PSD） is based on the fact that azeotropic composition varies with the operational pressure, by which azeotrope is then separated effectively. The azeotrope of tetrahydrofuran-ethanol characters that azeotropic point appears in the vapor-liquid equilibrium, which makes it hard to separate tetrahydrofuran-ethanol liquid mixture experimentally and industrially. PSD is expected to fix this kind of separations effectively. In the research a dual column process flow of tetrahydrofuran-ethanol pressure-swing distillation was put forward based on thermodynamics analysis. Aspen Plus simulation of pressure-swing distillation process of tetrahydrofuran-ethanol azeotrope was carried out via NRTL-RK method. The technological parameters were optimized based on the process analysis. It shows that tetrahydrofuran-ethanol azeotrope can be well separated by means of a two-column pressure-swing distillation process, which is composed of atmospheric tower and high pressure tower （0.8 MPa）. It is helpful in guiding the process design for separation of tetrahydrofuran-ethanol azeotrope.

关 键 词：汽液平衡 共沸物 变压精馏 模拟 

分 类 号：TQ028.31[化学工程]