PROPOSAL OF NOVEL FACILITATED TRANSPORT MEMBRANE FOR GAS SEPARATION AND ITS APPLICATION FOR PROTECTION OF GLOBAL ENVIROMENT

开发了一种新型的中空纤维或毛细管型易输膜模块用于气体分离，其中原料气和载体溶液都被供应到模块的管腔（进料侧，高压侧），含有溶解气体的溶液在减压状态下从膜渗透到渗透侧（壳侧，低压侧）。在那里，溶解的气体从溶液中剥离出来，并作为富集气体回收。载体溶液通过泵循环到模块的管腔中。该膜系统应用于模拟烟气中CO_2的分离，以及化工过程中最耗能的乙烯/乙烷分离。得到了以下有希望的结果：在进料侧压力为常压、渗透侧压力为10kPa、进料侧压力为200 ~ 500kPa、渗透侧压力为常压的情况下，采用物理溶剂、水作为吸附剂对CO_2/N_2进行分离的实验表明，所提出的膜系统具有非常高的分离效率（bbb80 %）。采用不同胺作为CO_2载体对模型烟气进行CO_2分离，通过一级膜分离可将N_2中的CO_2从1.5 ~ 15%富集到98.5 ~ 99.8%。在原料气中CO_2浓度为10%时得到的典型结果如下：CO_2渗透率：1200GPU， CO_2/N_2选择性：80%，气体在模块中的平均停留时间=0.28_s。与传统的分离方法相比，能耗低得多。此外，采用热诱导相分离（TIPS）技术制备的内径较大的中空纤维超滤膜可显著降低能耗。结果表明，膜分离法是回收烟气中CO_2最节能的方法。在进料侧压力为200 ~ 500 kPa，渗透侧压力为常压的4M A_gNO3溶液中，乙烯/乙烷富集率从80%提高到99.8%。乙烯/乙烷选择性为300，乙烯透过率为300gpu。在不连续的几个月的测试期间，膜组件是稳定的，没有降低透性和选择性。少

A novel hollow fiber or capillary-type facilitated transport membrane module was developed for gas separation, in which both the feed gas and the carrier solution are supplied to the lumen of the module (feed side, high-pressure side) and the solution containing dissolved gas permeates the membrane to the permeate side (shell side, low-pressure side) maintained at a reduced pressure. There, the dissolved gas is stripped from the solution and recovered as an enriched gas. The carrier solution is recycled to the lumen of the module by a pump. This novel membrane system was applied to CO_2 separation from model flue gases, and also ethylene/ethane separation, which is one of the most energy intensive separations in chemical processes. The following promising results were obtained.1. The proposed membrane system was found to have very high efficiency (>80%) by the experiments on the CO_2/N_2 separation using a physical solvent, water as an absorbent for the case where the feed side pressur … More e was atmospheric and the permeate side pressure was about 10kPa and also for the case where the feed side pressure was 200 to 500kPa and the permeate side pressure was atmospheric.2. In the separation of CO_2 from model flue gases using various amines as carriers of CO_2, CO_2 in N_2 could be enriched from 1.5-15% to 98.5-99.8% by a one stage membrane separation. The typical results obtained at 10% CO_2 in the feed gas were as follows. CO_2 permeance: 1200GPU, CO_2/N_2 selectivity: 80% at the mean residence time of gas in module=0.28_s. The energy consumption was much lower than those of conventional separation methods. Furthermore, by using hollow fiber ultrafiltration membranes with a larger inside diameter, which was fabricated by the thermally induced phase separation (TIPS) technique, the energy consumption was remarkably reduced. It was found that the present membrane separation method was the most energy saving method for the CO_2 recovery from flue gases.3. In the ethylene/ethane separation using a 4M A_gNO3 solution, where the feed side pressure was from 200 to 500 kPa and the permeate side was atmospheric pressure, ethylene was enriched from 80% to 99.8%. The ethylene/ethane selectivity was 300, and the ethylene permeance was 300GPU.4. The membrane modules were stable during a discontinuous several-month testing period without the decreases in permeance and selectivity. Less