碳酸丙烯酯生产工艺分离工段的模拟优化
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摘要
利用Aspen Plus模拟软件对CO_2捕集生产碳酸丙烯酯精馏工段进行模拟优化。首先根据物系性质选取合适的热力学方法和模拟模型,再对待分离组分进行分析,确定合适的分离序列,即采用双塔精馏,主要产品碳酸丙烯酯在一塔塔釜获得,副产品丙二醇在塔塔釜获得;运用Aspen Plus中的DSTWU模块,确定精馏塔的初始参数。在初始参数下,利用Aspen Plus的Rad FRac模块对二塔进行严格计算,并通过多次优化得到了合适的进料温度、操作压力;利用Sensitivity模块进行灵敏度分析,得到2个塔的进料位置、回流比、馏出比等参数的优化结果。产品PC质量分数达到99.6%,产品PG质量分数达到99.9%,达到分离要求。
This paper mainly uses the Aspen Plus simulation software to simulate and optimize the distillation section in the production of propylene carbonate by capture of CO_2. Firstly,the suitable thermodynamic method and simulation model are selected according to the physical properties of substances. And then,the components to be separated are analyzed in order to determine appropriate separation sequence. Finally,the double columns distillation process is employed,in which the main product propylene carbonate is obtained at the kettle of the first column and the by-product propylene glycol is obtained at the kettle of the second column.The DSTWU module in Aspen Plus is used to determine the initial parameters of distillation columns.Given the determined initial parameters,the Rad FRac module in Aspen Plus is used to carry out rigorous calculation on two columns,and the proper feeding temperature and operating pressure are obtained through several times of optimization.The sensitivity module is used to do sensitivity analysis,and the optimization results of feeding position,reflux ratio and distillate ratio for both two columns are obtained. The mass fraction of propylene carbonate product reaches 99. 6% and that of propylene glycol product reaches99. 9%,both meeting the separation requirements.
This paper mainly uses the Aspen Plus simulation software to simulate and optimize the distillation section in the production of propylene carbonate by capture of CO_2. Firstly,the suitable thermodynamic method and simulation model are selected according to the physical properties of substances. And then,the components to be separated are analyzed in order to determine appropriate separation sequence. Finally,the double columns distillation process is employed,in which the main product propylene carbonate is obtained at the kettle of the first column and the by-product propylene glycol is obtained at the kettle of the second column.The DSTWU module in Aspen Plus is used to determine the initial parameters of distillation columns.Given the determined initial parameters,the Rad FRac module in Aspen Plus is used to carry out rigorous calculation on two columns,and the proper feeding temperature and operating pressure are obtained through several times of optimization.The sensitivity module is used to do sensitivity analysis,and the optimization results of feeding position,reflux ratio and distillate ratio for both two columns are obtained. The mass fraction of propylene carbonate product reaches 99. 6% and that of propylene glycol product reaches99. 9%,both meeting the separation requirements.
引文
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[14]潘有江,刘志刚,崔嘉敏,等.降低丙烯酸装置轻组分分馏塔蒸汽消耗量的措施[J].石化技术与应用,2012,30(1):56-58.
[15]方晓明.丙烯酸精制单元轻组分分馏塔的流程模拟[J].石油化工应用,2008,27(5):58-61.
[16]李武东,黄前程,朱志亮.醋酐精馏工艺模拟计算与优化设计[J].现代化工,2016,36(7):181-185.
[17]刘绪江,张雷.醋酸-水萃取精馏萃取剂的选择及过程模拟和优化[J].现代化工,2015,35(8):165-168.
[18]佟昊,董守亮.影响精馏操作的主要因素及精馏节能技术浅析[J].中国石油和化工标准与质量,2012,33(12):29.
[19]徐忠,陆恩锡.蒸馏过程进料位置优化[J].化学工程,2008,(7):74-78.
[2]唐占忠.新型催化剂下碳酸丙烯酯合成条件的优化[J].化学研究与应用,1997,9(4):366-367.
[3]周学良.碳酸丙烯酯脱碳脱硫技术在天然气净化工艺中的应用[J].石油与天然气化工,2006,150(3):17-25.
[4]Wang X Y,Liu S Q,Huang K L,et al.Fixation of CO2by electrocatalytic reduction to synthesis of dimethyl carbonate in ionic liquid using effective silver-coated nanoporous copper composites[J].Chinese Chemical Letters,2010,21(8):987-990.
[5]Nicolas E,Li C J.Conversion of carbon dioxide and olefins into cyclic carbonates in water[J].Green Chemistry,2007,9:213-215.
[6]张跃,李静,严生虎,等.Ce助剂对Cu O-Zn O-Al2O3/HZSM-5在CO2加氢合成二甲醚的性能影响[J].化工进展,2011,30(3):542-546.
[7]Wang J L,Wang J Q,He L N,et al.A CO2/H2O2-tunable reaction:Direct conversion of styrene into styrene carbonate catalyzed bysodium phosphotungstate/n-Bu4NBr[J].Green Chemistry,2008,10:1218-1223.
[8]Dorner R W,Hardy D R,Williams F W,et al.K and Mn doped iron-based CO2hydrogenation catalysts:Detection of KAl H4as partof the catalyst's active phase[J].Appl Catal A,2010,373:112-121.
[9]赵艳敏,刘绍英,王公应.碳酸丙烯酯/碳酸乙烯酯的制备技术研究进展[J].现代化工,2005,25(S1):19-22.
[10]王元,曹广安,宋振久,等.尿素与丙二醇合成碳酸丙烯酯的中试研究[J].化肥工业,2014,3:64-66,71.
[11]赵元,漆新华,何良年,等.碳酸丙烯酯合成的工艺绿色化进展[J].化学世界,2008,(11):696-699.
[12]唐勇,沈本贤,张庆芳,等.热敏性物质精馏系统的模拟优化[J].现代化工,2008,28(S1):141-143.
[13]罗舜皓,刘忠德,俞燕龙,等.丙烯酸精制单元急冷塔的模拟[J].甘肃科技,2010,26(6):21-24.
[14]潘有江,刘志刚,崔嘉敏,等.降低丙烯酸装置轻组分分馏塔蒸汽消耗量的措施[J].石化技术与应用,2012,30(1):56-58.
[15]方晓明.丙烯酸精制单元轻组分分馏塔的流程模拟[J].石油化工应用,2008,27(5):58-61.
[16]李武东,黄前程,朱志亮.醋酐精馏工艺模拟计算与优化设计[J].现代化工,2016,36(7):181-185.
[17]刘绪江,张雷.醋酸-水萃取精馏萃取剂的选择及过程模拟和优化[J].现代化工,2015,35(8):165-168.
[18]佟昊,董守亮.影响精馏操作的主要因素及精馏节能技术浅析[J].中国石油和化工标准与质量,2012,33(12):29.
[19]徐忠,陆恩锡.蒸馏过程进料位置优化[J].化学工程,2008,(7):74-78.