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    袁海宽, 许振良, 马晓华, 魏永明, 齐峻, 曾义红. PVA-PFSA/PAN渗透汽化膜强化乙酸乙酯酯化脱水及工艺过程模拟[J]. 华东理工大学学报(自然科学版), 2009, (2): 174-179.
    引用本文: 袁海宽, 许振良, 马晓华, 魏永明, 齐峻, 曾义红. PVA-PFSA/PAN渗透汽化膜强化乙酸乙酯酯化脱水及工艺过程模拟[J]. 华东理工大学学报(自然科学版), 2009, (2): 174-179.
    PVA-PFSA/PAN Composite Membrane for Pervaporation Dehydration in the Enhanced Esterification of Ethyl Acetate Production and Process Simulation[J]. Journal of East China University of Science and Technology, 2009, (2): 174-179.
    Citation: PVA-PFSA/PAN Composite Membrane for Pervaporation Dehydration in the Enhanced Esterification of Ethyl Acetate Production and Process Simulation[J]. Journal of East China University of Science and Technology, 2009, (2): 174-179.

    PVA-PFSA/PAN渗透汽化膜强化乙酸乙酯酯化脱水及工艺过程模拟

    PVA-PFSA/PAN Composite Membrane for Pervaporation Dehydration in the Enhanced Esterification of Ethyl Acetate Production and Process Simulation

    • 摘要: 以聚丙烯腈(PAN)中空纤维超滤膜为底膜,以酒石酸(Tac)为交联剂,制备了聚乙烯醇(PVA)与全氟磺酸(PFSA)共混复合膜,并用于乙酸乙酯-水、乙酸乙酯-乙醇-水溶液的脱水研究。考察了分离乙酸乙酯水二元溶液时,料液温度和含水量对复合膜分离性能的影响;40 ℃下分离含水2%(质量分数,下同)的乙酸乙酯水溶液时,其总渗透通量81.1 g/(m2·h),分离因子为1890;考察了复合膜用于分离乙酸乙酯乙醇水(质量比90∶2∶8)三元溶液时,料液温度的影响及脱水效果。结果表明:40 ℃时复合膜对三元溶液的总渗透通量可达251.0 g/(m2·h),此温度下,只需12 h就可将含8%初始水的三元溶液脱水至4.66%。PVA-PFSA/PAN渗透汽化膜对乙酸乙酯体系的脱水效果良好,可应用于强化乙酸乙酯酯化生产工艺。利用Aspen Plus 11.1软件对工艺流程进行了模拟,结果表明:在同等操作条件下,渗透汽化膜强化酯化工艺流程相对于普通的反应精馏,提高了乙酸乙酯的单程收率和原料的转化率,简化了乙酸乙酯生产流程。

       

      Abstract: Using the hollow fiber ultrafiltration membrane of polyacrylonitrile (PAN) as the support layer and the tartaric acid (Tac) as the cross-linking agent, the polyvinyl alcohol-perfluorosulfonic acid/polyacrylonitrile (PVA-PFSA/PAN) composite pervaporation membrane was prepared for dehydration of ethyl acetate (EAc)-H2O and EAc-ethanol (EtOH)-H2O solutions. Effects of feed temperature and water content on the pervaporation performance were investigated for dehydration of EAc-H2O solutions. Total permeation flux and separation factor of PVA-PFSA/PAN composite membrane for the feed water concentration of 2% (mass fraction) at 40 ℃ were 81.1 g/(m2·h) and 1890, respectively. In addition, when EAc-EtOH-H2O (mass ratio is 90∶2∶8) ternary solutions were dehydrated, effect of feed temperature and dehydration performance were studied. Total permeation flux of PVA-PFSA/PAN composite membrane was 251.0 g/(m2·h) at 40 ℃, and the mass fraction of feed water was decreased from 8% to 4.66% after 12 h. The PVA-PFSA/PAN composite membrane had good dehydration performance, and could be applied in the new enhanced esterification process of EAc production. Commercial software Aspen Plus 11.1 was used to simulate the process. The simulation results showed that the onepass yield of EAc and the conversion of raw materials in the process were enhanced at the same operating conditions compared with the conventional reactive distillation, and the process of EAc production simplified.

       

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