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过程工程学报 ›› 2020, Vol. 20 ›› Issue (1): 52-58.DOI: 10.12034/j.issn.1009-606X.219156

• 过程与工艺 • 上一篇    下一篇

甲基氯硅烷精馏流程的模拟与优化

曾雄伟1， 彭金鑫2， 奚桢浩1,3*， 赵 玲1,3， 袁渭康1， 聂长虹2， 赵晓辉2   

  1. 1. 华东理工大学化学工程联合国家重点实验室，上海 200237 2. 合盛硅业股份有限公司，浙江 嘉兴 314201 3. 华东理工大学过程系统工程教育部工程研究中心，上海 200237
  • 收稿日期:2019-03-13 修回日期:2019-05-04 出版日期:2020-01-22 发布日期:2020-01-14
  • 通讯作者: 奚桢浩 zhhxi@ecust.edu.cn
  • 基金资助:
    中央高校基本科研业务费专项资金;浙江省重点研发计划

Simulation and optimization of methylchlorosilane distillation scheme

Xiongwei ZENG1, Jinxin PENG2, Zhenhao XI1,3*, Ling ZHAO1,3, Weikang YUAN1, Changhong NIE2, Xiaohui ZHAO2   

  1. 1. State Key Laboratory of Chemical Engineering, East China University of Science and Technology, Shanghai 200237, China 2. Hoshine Silicon Industry Co., Ltd., Jiaxing, Zhejiang 314201, China 3. Engineering Research Center of Process System Engineering, East China University of Science and Technology, Shanghai 200237, China
  • Received:2019-03-13 Revised:2019-05-04 Online:2020-01-22 Published:2020-01-14
  • Contact: XI Zhen-hao zhhxi@ecust.edu.cn

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摘要： 采用Aspen plus软件对工业七塔精馏过程进行全流程建模与模拟，优化工艺参数，研究了新的精馏节能工艺。对一甲塔等7个精馏塔采用双因素水平的灵敏度分析，考察了塔釜采出率、回流比、进料位置和塔顶压力对产品浓度和热负荷的影响，确定一甲塔最优的工艺参数：塔釜摩尔采出率为0.92，摩尔回流比为130，塔顶压力为0.18 MPa，总理论板数为400，在210块理论板位置进料。在此基础上，针对高能耗的脱高塔/脱低塔，模拟研究了双效精馏新工艺，新工艺可节省39.70%的年总成本；针对一甲塔模拟研究了热泵精馏新工艺，新工艺可降低41.42%的年总成本。

关键词: 甲基氯硅烷, Aspen plus, 双效精馏, 热泵精馏

Abstract: Methylchlorosilane crude monomer is the mixture of several components with a close boiling point, which demands high mass purity in subsequent polysiloxane polymerization process. Traditionally, seven to ten distillation columns are used to separate these methylchlorosilane components with huge energy consumption. In the field of this research, prevailing industrial seven-column scheme was simulated by using Aspen plus software. The effect of distillation column bottom extraction ratio, reflux ratio, feed stage and top pressure on product concentration and heat duty were studied systematically for the optimization of operation conditions using the method of double factors sensitivity analysis. According to sensitivity analysis, the appropriate operation conditions of Me1 column were as follows, that molar bottom extraction rate was 0.92, molar reflux ratio was 130, feed position was at 210th theoretical stage and top pressure was 0.18 MPa, respectively. According to energy calculation of seven-column scheme, heavies removal column, low removal column and Me1 column took up 96.2% of total heat duty consumption. In order to reduce energy consumption, new energy saving scheme was studied and simulated. Thermodynamic analysis showed that pressure was a non-significant influencing factor for key components separation of heavies removal column and low removal column. So, a more energy-efficient distillation process, double effect distillation, had been studied for two columns to achieve heat integration between heavies removal column condenser and low removal column reboiler. The result of rigorous simulation showed that the new double effect distillation scheme, comparing to original two-column scheme, can reduce total annual cost (TAC) by 39.70%. The thermodynamic analysis of Me1 column showed that relative volatility of key binary components was near 1. So the heat pump distillation scheme had been developed to improve heat efficiency of Me1 column. The result of rigorous simulation showed that heat pump distillation scheme, comparing to original Me1 column scheme, can reduce TAC by 41.42%.

Key words: Chloromethylsilane, Aspen plus, heat pump, double effect distillation