用于从CO_2-DMC体系分离CO_2的PDMS复合膜制备与分离性能  

Preparation and Separation Performance of PDMS Composite Membranes for CO_2 Separation from CO_2-DMC System

作　　者：贺志敏[1] 汤志刚[1] Ataeivarjovi Ebrahim 郭栋 赵志军[1] 李红伟[1] 邢潇[1] 

机构地区：[1]清华大学化学工程联合国家重点实验室,北京100084

出　　处：《高校化学工程学报》2017年第5期1042-1051,共10页Journal of Chemical Engineering of Chinese Universities

摘　　要：溶剂吸收-膜解吸联合工艺是一种新型具有较低能耗的燃烧前CO_2捕集方法,高通量和高分离因子的解吸膜制备成为此技术的关键。以醋酸纤维素超滤膜为基膜,在聚二甲基硅氧烷(PDMS)中加入不同交联剂进行改性,制备了从CO_2-碳酸二甲酯(DMC)混合液中解吸分离CO_2的非对称渗透汽化膜。研究表明可以从溶解活性、扩散活熊、反应活性提高膜的解吸性能,并研究了不同改性交联剂、膜层厚度、交联温度、解吸液浓度和解吸温度等因素对膜解吸CO_2性能的影响。与文献相比,优化制备所得的PDMS-APTES(3-氨基丙基三乙氧基硅烷)—PTES(苯基三乙氧基硅烷)复合膜具有较大的通量(4970 g×m^(-2)×h^(-1))和分离因子(79.3),具有一定潜在工业应用价值。Solvent absorption coupled membrane desorption is a novel pre-combustion CO_2 capture process with lower energy consumption. Preparation of desorption membranes with high flux and high separation factor is the key of this technology. A polydimethylsiloxane（PDMS） modified composite pervaporation membrane with cellulose acetate ultra-filtration layer was prepared to separate CO_2 from CO_2-dimethyl carbonate（DMC） solution. The result shows that membrane performance is enhanced via adjustment of dissolution activity, diffusion activity and reaction activity by adding different cross-linking agents in PDMS. Meanwhile, the effects of modification cross-linking agents, membrane thickness, cross-linking temperature, desorption solution concentration and desorption temperature on membrane desorption performance were studied. Compared with the literature data, the 3-aminopropyltriethoxysilane（APTES）-phenyltriethoxysilane（PTES）-PDMS composite membrane obtained under optimal preparing conditions has much higher flux（4970 g×m^（-2）×h^（-1）） and separation factor（79.3）, which is promising for industrial application.

关 键 词：CO2捕集 膜解吸 PDMS膜 膜改性 渗透汽化 

分 类 号：TQ028.8[化学工程]