CAJ | 학술논문

渗透汽化膜技术替代传统精馏工艺分离环戊二烯/甲基环戊二烯碳五馏分同系物。以丙酮为非极性成膜添加剂，水为凝胶介质，采用溶胶-凝胶二步法合成 BPADA-ODA 非对称聚酰亚胺膜，利用 FT-IR 表征聚酰胺酸和非对称膜组成，SEM 表征膜表面和断面结构形貌，并探讨膜厚、原料液流量等膜工艺参数对分离性能的影响。结果表明：BPADA 与 ODA 化学亚胺化完全，膜表面无孔致密，膜断面为致密皮层和指状多孔支撑层构成，膜厚增加，膜分离因子增大而渗透通量减小，最优膜厚为110μm，原料流量为30 mL·min-1。膜分离性能长期稳定,32 h 渗透通量可达236.6 mg·m-2·h-1，CPD 分离因子达1.61，原料液可分离提纯96.2%(wt)的甲基环戊二烯。
삼투기화막기술체대전통정류공예분리배무이희/갑기배무이희탄오류분동계물。이병동위비겁성성막첨가제，수위응효개질，채용용효-응효이보법합성 BPADA-ODA 비대칭취선아알막，이용 FT-IR 표정취선알산화비대칭막조성，SEM 표정막표면화단면결구형모，병탐토막후、원료액류량등막공예삼수대분리성능적영향。결과표명：BPADA 여 ODA 화학아알화완전，막표면무공치밀，막단면위치밀피층화지상다공지탱층구성，막후증가，막분리인자증대이삼투통량감소，최우막후위110μm，원료류량위30 mL·min-1。막분리성능장기은정,32 h 삼투통량가체236.6 mg·m-2·h-1，CPD 분리인자체1.61，원료액가분리제순96.2%(wt)적갑기배무이희。
Pervaporation membrane process was investigated for separating a homologues system of cyclopentadiene/methylcyclopentadiene(CPD/MCPD) from cracking C5 fractions instead of traditional distillation. BPADA-ODA asymmetric polyimide membranes were prepared by two-step sol gel method using nonpolar acetone as an additive and water as gel medium. The prepared membranes were applied to separate methylcyclopentadiene and cyclopentadiene mixtures with the preferential permeation of CPD. The characterizations of FT-IR spectrum and SEM indicate that chemical imidization of BPADA and ODA is complete, and the membranes present asymmetric construction with a dense skin layer and finger-like porous supporting layer. The results of pervaporation show that the separation factor of CPD increases and the permeation fluxes decrease with the increase of membrane thickness. The optimal membrane thickness is 110 μm, and optimal feed flux is 30 mL·min-1. The separation performance of the membranes is long-term stabilization in 32 h. The total flux and the separation factor of CPD are 236.6 mg·m-2·h-1 and 1.61, respectively. MCPD with purity of 96.2%(wt) can be obtained for the pervaporation of the industrial grade CPD/MCPD mixtures from a cracking C5 fraction.