Development of facilitated transport membrane-gas absorption hybrid system using new hollow fiber membrane

提出了一种用于分离CO_2的膜吸收混合体系。在该系统中，原料气（CO_2/CH_4混合物）和载体溶液（二乙醇胺水溶液）均供给中空纤维膜组件的管腔侧（进料侧、高压侧）并向上流动。含有溶解的CO_2的载体或吸收溶液渗透到膜并渗透到渗透侧（低压侧，壳侧），在那里溶液释放溶解气体成为稀薄溶液，稀薄溶液被循环到中空纤维的管腔中。新型中空纤维膜的研制中空纤维膜的性能是决定膜吸复合体系性能的关键因素之一。因此，在这项工作中，制备了几种新的中空纤维膜。采用热诱导相分离（TIPS）法制备了聚乙烯基丁醛(PVB)/EVOH共混膜和PVB- tio_2复合膜。中空纤维膜的亲水性对于载体溶液沿膜壁获得足够的润湿性是非常重要的。因此，采用TIPS和非溶剂诱导相分离（NIPS）法制备了含有聚合物表面活性剂Pluronic F127和Tetronic 1307的新型中空纤维膜。该方法对CO_2/CH_4的选择性为359 ~ 800，原料气中CO_2浓度为99.4 ~ 99.9mol%。估计了CO_2分离所需的能量。与传统的CO_2分离工艺相比，该系统具有经济优势。

A membrane-absorption hybrid system for separation of CO_2 was proposed. In this system, the feed gas (CO_2/CH_4 mixture) and carrier solution (aqueous diethanolamine solution) are both supplied to the lumen side (feed side, high pressure side) of the hollow fiber membrane module and flow upward. The carrier or absorbent solution, which contains dissolved CO_2, permeates the membrane and to the permeate side (low pressure side, shell side), where the solution liberates dissolved gas to become a lean solution and the lean solution is recycled to the lumen of the hollow fiber.1.Development of new hollow fiber membranesThe performance of the hollow fiber membrane is one of the key factors to determine the performance of this membrane-absorption hybrid system. Thus, in this work, several new hollow fiber membranes were prepared. The poly(vinyl butyral) (PVB)/EVOH blend membrane and PVB-TiO_2, composite membrane were successfully prepared by the thermally induced phase separation (TIPS). The hydrophilicity of the hollow fiber membrane is quite important to obtain the sufficient wettability of the carrier solution along the membrane wall. Therefore, the new hollow fiber membranes containing polymeric surfactant Pluronic F127 and Tetronic 1307 were also prepared by TIPS and nonsolvent induced phase separation (NIPS).2.CO_2/CH_4 separation by this hybrid methodThe selectivity of CO_2 over CH_4 was about 359-800 and CO_2 in the feed gas was concentrated to 99.4-99.9mol%. The energy required for CO_2 separation was estimated. The present CO_2 recovery system had an economic advantage over the conventional CO_2 separation processes.