Separation of methyl propionate-methanol azeotrope by extractive distillation
HAN Shu-cui1, YANG Jin-bei2
1. Department of Chemical Engineering, Zhicheng College, Fuzhou University, Fuzhou 350002, China; 2. School of Ocean Science and Biochemistry Engineering, Fuqing Branch of Fujian Normal University, Fuzhou 350300, China
Abstract: Methyl propionate-methanol binary azeotrope is separated by using extractive distillation process with phenol being screened as an extractant.The separation process is simulated through steady state Aspen Plus software.The effects of theoretical plate numbers,feed locations,reflux ratios and solvent ratios of both towers on the mass content of tower-top products and the energy consumption of reboilers are analyzed in detail through single factor optimization.The optimal parameters for the extractive distillation tower are obtained as follows:number of theoretical plate is 32,azeotrope is fed at the 16th plate,phenol is fed at the 6th plate,reflux ratio is 1.4,solvent ratio is 1.3 and the mass fraction of methanol at the top of tower can reach 99.9%.The optimal parameters for the solvent recovery tower are as follows:number of theoretical plate is 24,feed is at the 6th plate,reflux ratio is 1.3 and the mass fraction of methyl propionate at the top of tower can reach 99.9%.Moreover,this continuous extractive distillation process is verified to be feasible through experiments based on the simulation and optimization.Finally,the engineering design for a company's 5 600 ton/year methyl propionate-methanol mixture separation process is carried out,which can supply basis for separation of binary azeotrope.
韩淑萃, 杨金杯. 丙酸甲酯和甲醇共沸物萃取精馏分离工艺的研究[J]. 现代化工, 2018, 38(7): 214-218.
HAN Shu-cui, YANG Jin-bei. Separation of methyl propionate-methanol azeotrope by extractive distillation. Modern Chemical Industry, 2018, 38(7): 214-218.
 Shariati A,Florusse L J,Kroon M C,et al.Bubble point pressures of binary system of methanol and methyl propionate[J].Fluid Phase Equilibria,2016,417:166-170.  Clegg W,Elsegood M R J,Eastham G R,et al.Highly active and selective catalysts for the production of methyl propanoate via the methoxycarbonylation of ethane[J].Chemical Communications,1999,(18):1877-1878.  程能林.溶剂手册[M].北京:化学工业出版社,2008.  Munoz R,Monton J B,Burguet M C,et al.Separation of isobutyl alcohol and isobutyl acetate by extractive distillation and pressure-swing distillation:Simulation and optimization[J].Separation and Purification Technology,2006,50(2):175-183.  张治山,姜爱国,李桂杰,等.含醇酯废水恒沸精馏分离工艺的模拟研究[J].现代化工,2015,35(11):168-171.  Smitha B,Suhanya D,Sridhar S,et al.Separation of organic-organic mixtures by pervaporation-a review[J].Journal of Membrane Science,2004,241(1):1-21.  关昶,丁斌,郝凤岭,等.酯交换-吸附脱甲醇工艺制备碳酸异辛酯的研究[J].化学世界,2016,57(2):113-117.  Wang Q,Yu B,Xu C.Design and control of distillation system for methylal/methanol separation.Part 1:Extractive distillation using DMF as an entrainer[J].Industrial & Engineering Chemistry Research,2012,51(3):1281-1292.  王菊,谭平华,宋吉英.甲醇-丙酸甲酯二元体系汽液平衡数据的测定与关联[J].天然气化工:C1化学与化工,2017,42(2):65-69.  戴典.苯酚丙酮装置设备腐蚀分析及解决措施[J].石油化工腐蚀与防护,2009,26(B05):101-104.