变压精馏分离甲醇-丙酮的工艺模拟及优化.pdfVIP

2013 年第 32 卷第 11 期 CHEMICAL INDUSTRY AND ENGINEERING PROGRESS ·2583· 化 工 进 展 变压精馏分离甲醇-丙酮的工艺模拟及优化 孔 鹏，高瑞昶 （天津大学化工学院，天津 300072） 摘 要：采用 Aspen Plus 软件，以塔釜能耗为目标，以甲醇、丙酮纯度为约束函数，对双效变压精馏分离甲 醇-丙酮工艺过程进行模拟。分析了操作压力、理论板数、回流比、进料位置和进料温度等参数对精馏过程的 影响。确定了最优工艺参数：减压塔操作压力 40 kPa，理论板数 37，回流比 2.4，进料塔板数 26，进料温度 25 ℃；常压塔理论板数 30，回流比 4.2，进料塔板数 23。减压塔所得甲醇质量分数为 99.0%，常压塔所得丙 酮质量分数为 99.7%。对比变压精馏和萃取精馏过程，变压精馏更容易得到高纯度丙酮产品，节能约 13.4%。 模拟结果对工业设计和设备改造具有一定指导意义。 关键词：甲醇；丙酮；变压精馏；优化模拟 中图分类号：TQ 028 文献标志码：A 文章编号：1000–6613（2013）11–2583–05 DOI：10.3969/j.issn.1000-6613.2013.11.009 Press-swing distillation process simulation for separation of methanol and acetone KONG Peng，GAO Ruichang （School of Chemical Engineering and Technology，Tianjin University，Tianjin 300072，China） Abstract：Methanol and acetone can form a minimum azeotrope，so it can not be separated by conventional distillation. Press-swing distillation was adopted to separate methanol and acetone and was simulated in this study. The influences of operation factors，such as stage number，reflux ratio， operating pressure，material feed location and feed temperature were analyzed. The vacuum tower operation parameters were as follows：operating pressure 40 kPa，stage number 37，reflux ratio 2.4， feed location 26 and material feed temperature 25 ℃. The atmospheric tower operation parameters were as follows：stage number 30，reflux ratio 4.2，feed location 23. High-purity separation could be realized. The purity of methanol could reach 99.0% and acetone could reach 99.7%. Comparison of extractive distillation and press-swing distillation was made. Press-swing distillation could get high purity products. Press-swing distillation could save energy by 13.4% as compared with extractive distillation. Key words：methanol；acetone；press-swing distillation；optimization simulation 甲醇和丙酮是工业上极为重要的有机化工原 料。甲醇主要用于生产甲醛，甲醛可以生产胶黏剂， 用作木材加工和模塑料、纺织物、涂料等处理剂。 常温下两者均为液体，甲醇沸点为 64.51 ℃，丙酮 沸点为 56.12 ℃。甲醇和丙酮可形成最低共沸物， 共沸点为 55.5 ℃[1] ，因此常规的精