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

开发了一种用于气体分离的新型中空纤维或毛细管型促进传递膜组件，其中进料气体和载体溶液都被供应到组件的内腔（进料侧，高压侧），并且含有溶解气体的溶液渗透膜到保持在减压下的渗透侧（壳侧，低压侧）。在那里，溶解的气体从溶液中汽提并作为富集气体回收。通过泵将载体溶液再循环至模块的内腔。将该膜系统应用于模拟烟气中CO_2的分离，以及乙烯/乙烷的分离，这是化工过程中最耗能的分离之一。获得了以下有希望的结果.以水为吸收剂的物理溶剂分离CO_2/N_2的实验表明，在进料侧压力为100 MPa时，该膜系统具有很高的分离效率（>80%）。 关于我们 e为大气压且渗透侧压力为约10 kPa的情况，以及进料侧压力为200至500 kPa且渗透侧压力为大气压的情况。在用各种胺作CO_2载体分离模拟烟气中的CO_2时，N_2中的CO_2经一级膜分离可从1.5-15%富集到98.5-99.8%。在原料气中CO_2含量为10%时，得到的典型结果如下。当气体在组件中的平均停留时间为0.28s时，CO_2渗透率为1200 GPU，CO_2/N_2选择性为80%。与常规分离方法相比，能耗低得多。此外，通过使用具有较大内径的中空纤维超滤膜，这是由热致相分离（TIPS）技术制造的，能量消耗显着降低。结果表明，膜分离法是目前烟气中CO_2回收最节能的方法.在使用4 M AgNO 3溶液的乙烯/乙烷分离中，其中进料侧压力为200至500 kPa且渗透侧为大气压，乙烯富集80%至99.8%。乙烯/乙烷选择性为300，乙烯渗透率为300 GPU.膜组件在连续几个月的测试期间是稳定的，没有渗透性和选择性的下降。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