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

新型气体分离促进传输膜的提案及其在保护全球环境中的应用

基本信息

批准号：
14350417
负责人：
TERAMOTO Masaaki
金额：
$ 8.06万
依托单位：
KYOTO INSUTITUTE OF TECHNOLOGY
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
2002
资助国家：
日本
起止时间：
2002 至 2003
项目状态：
已结题

项目摘要

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

开发了一种新型的中空纤维或毛细管式促进传质膜分离装置，该装置将进料气和载液同时提供到组件的内腔(进料侧、高压侧)，含有溶解气体的溶液通过膜渗透到保持减压的渗透侧(壳侧、低压侧)。在那里，溶解的气体被从溶液中剥离并作为浓缩气体回收。通过泵将载体溶液回收到模块的内腔。这种新型膜系统被应用于模拟烟气中的CO2分离，以及化工过程中能量最密集的乙烯/乙烷分离。取得了以下可喜成果：1.实验表明，在进料侧压力为…的情况下，以水为吸收溶剂进行的CO_2/N_2分离实验表明，该膜系统具有很高的分离效率(80%)在进料侧压力为200~500kPa，渗透侧压力为大气压的情况下，渗透侧压力约为10kPa。在以各种胺为载体的模拟烟道气中CO_2的分离中，一段膜分离可使N_2中的CO_2从1.5-15%浓缩到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：CO_2渗透率：1200GPU，CO_2/N_2选择性：80%，气体在模块内的平均停留时间=0.28_S，能耗远低于常规分离方法。此外，采用热诱导相分离(TIPS)技术制备的中空纤维超滤膜内径较大，能耗显著降低。结果表明，膜分离法是从烟气中回收CO_2最节能的方法。在进料侧压力为200~500kPa，渗透侧为常压的4M硝酸铵溶液中，乙烯的浓缩率由80%提高到99.8%。乙烯/乙烷选择性为300，乙烯渗透率为300GPU。膜组件在不连续的几个月的测试期间是稳定的，没有渗透率和选择性的下降。较少