CO_2捕集生产碳酸丙烯酯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,副产品丙二醇在二塔塔釜获得。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模块对两塔进行严格计算,并通过多次优化得到合适的进料温度、操作压力;利用Sensitivity模块进行灵敏度分析,得到两塔的进料位置、回流比、馏出比等参数的优化结果。最终确定一塔的进料温度为80℃、塔顶压力为0.02 MPa回流比为4.26、塔板数为22、进料位置为第9块板;二塔的进料温度为25℃、塔顶压力为1 MPa、回流比为1.47、塔板数为21、进料位置为第12块板,提高了精馏塔的操作水平,减少能耗,降低了生产成本。
The separation process of propylene carbonate from CO_2 and propylene oxide is simulated by using Aspen Plus software. The separation process is calculated and studied by selecting the appropriate simulation model and thermodynamic method according to the operation features and physical and chemical properties of the raw materials. The main operation parameters are studied by using sensitivity analysis tools in Aspen Plus. The simulation results show that all of the parameters can reflect the operation process very well. The optimized parameters are shown as follows: for the first column,80℃ of feed temperature,0. 02 MPa of top pressure,4. 26 of reflux ratio,22 of the plate number,the 9~(th) plate of the feeding position; for the second column,25 ℃ of the feed temperature,1 MPa of top pressure,1. 47 of reflux ratio,21 of the plate number,the 12 thplate of the feeding position. The steady-state simulation of the distillation column has an influence on improving the level of operation,increasing production,reducing energy consumption and conserving resource.
The separation process of propylene carbonate from CO_2 and propylene oxide is simulated by using Aspen Plus software. The separation process is calculated and studied by selecting the appropriate simulation model and thermodynamic method according to the operation features and physical and chemical properties of the raw materials. The main operation parameters are studied by using sensitivity analysis tools in Aspen Plus. The simulation results show that all of the parameters can reflect the operation process very well. The optimized parameters are shown as follows: for the first column,80℃ of feed temperature,0. 02 MPa of top pressure,4. 26 of reflux ratio,22 of the plate number,the 9~(th) plate of the feeding position; for the second column,25 ℃ of the feed temperature,1 MPa of top pressure,1. 47 of reflux ratio,21 of the plate number,the 12 thplate of the feeding position. The steady-state simulation of the distillation column has an influence on improving the level of operation,increasing production,reducing energy consumption and conserving resource.
引文
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[3]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.
[4]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.
[5]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.
[6]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.
[7]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.
[8]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,2008,49(11):696-699.
[9]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.
[10]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.
[11]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.
[12]方晓明.丙烯酸精制单元轻组份分馏塔的流程模拟[J].石油化工应用,2008,27(5):58-61.
[13]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.
[14]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.
[15]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):29-30.
[16]徐忠,陆恩锡.蒸馏过程进料位置优化[J].化学工程,2008,36(7):74-78.
[17]陈钟秀,顾飞燕.化工热力学[M].北京:化学工业出版社,1996.