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用国产醋酸纤维素(CA)作膜材料,用石大-1号溶液及石大-2号溶液作添加剂。利用相转化法制成不对称的CA反渗透膜。然后用多级溶剂交换技术进行膜的干燥。再分别用纯CO_2、纯CH_4、CO_2-CH-4混合气及胜利油田滨南采油厂的天然气,在室温下对所制得的CA干膜进行渗透试验。研究了添加剂、多级溶剂交换技术中所用的第二溶剂、操作压力及进料浓度对膜分离特性的影响。结果表明,制膜过程中所用的添加剂及溶剂交换技术中所用的第二溶剂对膜的分离特性有重大影响。

Experimental Study of Using CA Membrane to Removal Acid Gas in Natural Gas

Taking the cellulose acetate(CA)made in China as membrane material, Shida-1 and Shida-2 so- lutions as additives, unsymmetrical CA anti impregnation membrane is made by facies conversion method, and then the membrane is dried by multistage solvent exchange technique. The permeability experiment on the CA dried membrane is made in the condition of indoor temperature respectively us- ing pure CO_2, pure CH_4, CO_2-CH_4 mixed gas and the natural gas from Bingnan oil producing plant in Shengli oil field. The experimental result shows that the additives used in the course of making mem- brane, the second solvent while using multi-stage solvent exchange technique, the operating pressure and feeding consistency are great influence on membrane seperating character.