共沸精馏提浓稀醋酸模拟研究  

Simulation study on the concentration of dilute acetic acid by azeotropic distillation

作　　者：王明 汪严 符吕成 汪杰[1] 秦旭旭 何凡 WANG Ming;WANG Yan;FU Lvcheng;WANG Jie;QIN Xuxu;HE Fan(Department of Chemical and Material Engineering,Hefei University,Hefei 230601,China)

机构地区：[1]合肥学院能源材料与化工学院,安徽合肥230601

出　　处：《周口师范学院学报》2023年第5期40-44,共5页Journal of Zhoukou Normal University

基　　金：2022年安徽省大学生创新训练计划项目(1602595500316430336)。

摘　　要：利用AspenPlus软件,在NRTL-HOC热力学条件下,以对二甲苯(PX,下同)为夹带剂,进行稀醋酸提浓的共沸精馏模拟。经过全流程优化计算,获得了共沸精馏模拟分离的最佳操作参数:塔底物质的量馏出比(塔底出料物质的量流量与原料液与夹带剂进料物质的量流量总和比,下同)为0.251,全塔40块理论板,稀醋酸从第23板进料,夹带剂从第2块板进料,较佳的物质的量回流比为4.4,较佳的进料比(夹带剂与稀醋酸进料质量流量比,下同)为0.8。在最佳操作参数下,共沸精馏分离出醋酸的质量浓度高达99.99%,水的质量浓度高达99.72%,该工艺中醋酸质量回收率高达99.82%,水的质量回收率高达99.98%,塔釜的热负荷为1852.86kW,满足分离要求。Using Aspen Plus software,azeotropic distillation simulation of dilute acetic acid concentration was carried out under NRTL-HOC thermodynamic conditions using p-xylene(PX,similarly hereinafter)as an entrainer.After the entire process optimization calculation,the optimal operating parameters for azeotropic distillation simulation separation were obtained:the molar distillation ratio at the bottom of the tower(the ratio of the molar flow rate of the tower bottom discharge to the total molar flow rate of the raw material liquid and entrainer feed,the same below)was 0.251,with 40 theoretical plates in the entire tower,dilute acetic acid fed from the 23rd plate,entrainer fed from the 2nd plate,and the optimal molar reflux ratio of 4.4.The optimal feed ratio(mass flow ratio of entrainer to dilute acetic acid feed,the same below)is 0.8.Under the optimal operating parameters,the mass concentration of acetic acid separated by azeotropic distillation is as high as 99.99%,and the mass concentration of water is as high as 99.72%.In this process,the mass recovery rate of acetic acid is as high as 99.82%,and the mass recovery rate of water is as high as 99.98%.The thermal load of the tower kettle is 1852.86 kW,which meets the separation requirements.

关 键 词：ASPENPLUS 共沸精馏 模拟 

分 类 号：TQ028[化学工程]