摘要
由于四氢呋喃与水会生成沸点64℃的最低共沸物,采用三塔联合精馏的方法对其进行分离。根据文献资料选择乙二醇作为萃取精馏过程的萃取剂,并在脱水塔中对萃取精馏塔产物进行脱水。选择Aspen Plus软件对工艺流程进行模拟。选择Wilson模型及Rad Frac模块对单塔工艺参数进行模拟及优化,确定了各塔进料板与回流比等最适宜参数。经实验考察的项目结果均与模拟结论一致。脱水塔产物四氢呋喃含水量可低至170μg/g。根据优化后的参数在Aspen Plus中进行全工艺流程的闭合与模拟,终产物四氢呋喃的质量分数可达0.9995,收率为0.9988。其质量分数优于常见双塔萃取精馏流程。
Mixture of tetrahydrofuran and water can form a minimum boiling azeotrope, which has a boiling point of 64 ℃, and it was separated by a united distillation process with three columns in this study. Ethylene glycol was selected as the extractant in extractive distillation on the basis of reported literatures, and the product from extractive distillation column was dehydrated in dehydrating column. Technical process was simulated by Aspen Plus. Processing parameters of single column such as feed stage and mass reflux ratio were simulated, optimized and determined using Wilson model and RadFrac module. The parameters studied by experiment were all in accordance with results from simulation. Product of tet- rahydrofuran obtained from dehydrating column achieved water content as low as 170 txg/g. Adopting op- timized parameters; the whole process was simulated in Aspen Plus. The product could achieve a purity of 0. 9995, with a yield of 0. 9988. The purity is better than those achieved by common extractive distillation process with two columns.
出处
《化学工业与工程》
CAS
CSCD
2015年第1期48-53,共6页
Chemical Industry and Engineering
