低共熔溶剂萃取精馏分离乙醇-水共沸物的研究
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摘要
分别以氯化胆碱/甘油(摩尔比为1∶2)低共熔溶剂(Reline)和乙二醇为萃取剂,对乙醇脱水萃取精馏过程进行模拟研究,并以最小年度总费用TAC为目标函数,对2种工艺流程进行优化,得到了最优的操作条件。结果表明,与乙二醇萃取精馏流程相比,Reline萃取精馏中萃取剂用量降低20%,能耗费用降低21. 68%,年度总费用TAC降低19. 66%,具有明显的节能优势。对Reline常规萃取精馏进行节能研究,发现对该流程进行换热网络优化后,可使年总费用TAC下降7. 95%;而隔壁塔并不能降低整个过程的年总费用。
The separation of ethanol and water by extractive distillation is designed and simulated by Aspen Plus with low transition temperature mixtures ( LTTMs,choline chloride/urea = 1 ∶ 2) and ethylene glycol as extractant,respectively.Also,the minimal total annual cost( TAC) is used as the objective function to find the optimal design for these two extractive distillation systems.The results show that compared with ethylene glycol process,the usage amount of extractant in LTTMs process is 20% less,the operation cost is 21. 68% lower and the total annual cost is 19. 66% lower,indicating an economic advantage.In order to reduce TAC of the LTTMs extractive distillation process,various measures are taken.After the heat exchange network is optimized,TAC can be reduced by 7. 95%.However,the extractive dividing wall column distillation process cannot be helpful to reduce TAC by using such measurement.The results provide a design reference and theory basis for the industrial design of extractive distillation process to separate ethanol and water mixture.
The separation of ethanol and water by extractive distillation is designed and simulated by Aspen Plus with low transition temperature mixtures ( LTTMs,choline chloride/urea = 1 ∶ 2) and ethylene glycol as extractant,respectively.Also,the minimal total annual cost( TAC) is used as the objective function to find the optimal design for these two extractive distillation systems.The results show that compared with ethylene glycol process,the usage amount of extractant in LTTMs process is 20% less,the operation cost is 21. 68% lower and the total annual cost is 19. 66% lower,indicating an economic advantage.In order to reduce TAC of the LTTMs extractive distillation process,various measures are taken.After the heat exchange network is optimized,TAC can be reduced by 7. 95%.However,the extractive dividing wall column distillation process cannot be helpful to reduce TAC by using such measurement.The results provide a design reference and theory basis for the industrial design of extractive distillation process to separate ethanol and water mixture.
引文
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[12]Leron R B,Li M H.Molar heat capacities of choline chloride-based deep eutectic solvents and their binary mixtures with water[J].Thermochimica Acta,2012,530:52-57.
[13]Mirza N R,Nicholas N J,Wu Y,et al.Estimation of normal boiling temperatures,critical properties,and acentric factors of deep eutectic solvents[J].J Chem Eng Data,2015,60:1844-1854.
[14]Zhang H,Ye Q,Qin J W,et al.Design and control of extractive dividing-wall column for separating ethyl acetate-isopropyl alcohol mixture[J].Industrial&Engineering Chemical Research,2014,53:1189-1205.
[2]Rodriguez N R,Gonzalez A S B,Tijssen P M A,et al.Low transition temperature mixtures(LTTMs)as novel entrainers in extractive distillation[J].Fluid Phase Equilibr,2015,385:72-78.
[3]Kumar S,Singh N,Prasad R.Anhydrous ethanol:A renewable source of energy[J].Renew Sust Energ Rev,2010,14:1830-1844.
[4]Zhu Z Y,Ri Y S,Jia H,et al.Process evaluation on the separation of ethyl acetate and ethanol using extractive distillation with ionic liquid[J].Sep Purif Technol,2017,181:44-52.
[5]林子昕,安星,安维中,等.萃取精馏制取无水乙醇过程不同节能方案的对比[J].化工进展,2018,37(5):2016-2022.
[6]冯树波,赵亚男.萃取精馏沸点对萃取精馏制取无水乙醇总能耗的影响分析[J].计算机与应用化工,2015,32(7):851-854.
[7]Gjineci N,Boli E,Tzani A,et al.Seperation of the ethanol/water azetropic mixture using ionic liquids and deep eutectic solvents[J].Fluid Phase Equilibria,2016,424:1-7.
[8]李静,王克良,连明磊,等.[DMIM]MS萃取精馏制取无水乙醇的过程模拟[J].现代化工,2018,38(2):20-24.
[9]Francisco M,Gonzalez A S B,Kroon M C,et al.Comparison of a low transition temperature mixture(LTTM)formed by lactic acid and choline chloride with choline lactate ionic liquid and the choline chloride salt:Physical properties and vapour-liquid equilibria of mixtures containing water and ethanol[J].RSC Adv,2013,3:23553-23561.
[10]Rodriguez N R,Gonzalez A S B,Kroon M C,et al.Low transition temperature mixtures(LTTMs)as novel entrainers in extractive distillation[J].Fluid Phase Equilibr,2015,385:72-78.
[11]章连众,邓东顺,张卫东,等.低共熔溶剂存在下醇水共沸体系气液相平衡[C].中国化学会第十七届全国化学热力学和热分析学术会议,2014.
[12]Leron R B,Li M H.Molar heat capacities of choline chloride-based deep eutectic solvents and their binary mixtures with water[J].Thermochimica Acta,2012,530:52-57.
[13]Mirza N R,Nicholas N J,Wu Y,et al.Estimation of normal boiling temperatures,critical properties,and acentric factors of deep eutectic solvents[J].J Chem Eng Data,2015,60:1844-1854.
[14]Zhang H,Ye Q,Qin J W,et al.Design and control of extractive dividing-wall column for separating ethyl acetate-isopropyl alcohol mixture[J].Industrial&Engineering Chemical Research,2014,53:1189-1205.