TCY交联ACM渗透汽化膜对水中乙酸乙酯的分离

Pervaporation Separation of Ethyl Acetate from Aqueous Solution by Acrylate Rubber Membranes Crosslinked with Trimeric Thiocyanate

以三聚硫氰酸(TCY)为交联剂对丙烯酸酯橡胶(ACM)进行交联制得ACM/聚四氟乙烯(PTFE)渗透汽化复合膜。用红外光谱(FT-IR)研究了交联反应机理,用扫描电镜(SEM)表征ACM/PTFE复合膜微观结构。考察了交联剂用量、交联温度、料液浓度和料液温度对复合膜渗透汽化法分离乙酸乙酯/水性能的影响。FT-IR表明,TCY的-HS基和ACM的-CH2Cl基之间发生了脱HCl反应。当m(TCY)∶m(ACM)为5∶100,在150℃交联2h所制的复合膜在50℃时,对7%的乙酸乙酯/水溶液渗透通量为3631 g/(m2.h),分离因子为239。升高温度至70℃时,渗透通量可达7918g/(m2.h),分离因子降低到195。

ACM/PTFE composite membranes were prepared by coating acrylate rubber （ACM） crosslinked with trimeric thiocyanate （TCY） on the polytetrafluoroethylene （PTFE） microfiltration membrane. The crosslinking mechanism was investigated by FT-IR, and the microstructures of ACM/PTFE composites membranes were characterized by SEM. The effects of crosslinking agent amount, crosslinking temperature, EtAc concentration and feed temperature on pervaporation performance of EtAc/water mixture were investigated. The FT-IR results show that dehydrochlorination reaction occurs between the - SH groups of TCY and - CH2Cl groups of ACM. For 7 % EtAc/water mixture, the ACM/PTFE composite membrane has the permeation flux of 3631 g/（m2·h） and separation factor of 239, when temperature is 50 ℃, m （TCY） ： m （ACM） is 5 ： 100, and crosslinking temperature is 150 ℃ for 2 hours. When the temperature increases to 70 ℃ , the permeation flux increases to 7918 g/（m2·h） and separation factor decreases to 195.