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利用聚二甲基硅氧烷/聚醚酰亚胺(PDMS/PEI)非对称平板复合膜,以CO2/CH4混合体系作为研究对象,考察了原料气组成、原料气压力、渗余相流量、温度对分离过程的影响。结果表明:随着原料气中CH4组成的提高,CO2渗透速率下降,分离因子先升高,但在CH4体积分数大于0.5时,分离因子开始下降;随着原料气压力的提高,CO2的渗透速率和分离因子均为下降趋势;在不同压力和温度下,随着渗余相流量的增大,CO2渗透速率基本维持稳定,分离因子略有上升,其中在低压或者低温下,CO2分离因子变化不大,在高压或者高温下,CO2分离因子上升明显。
Using the asymmetric flat-plate composite membrane of polydimethylsiloxane / polyetherimide (PDMS / PEI) and CO2 / CH4 mixed system as the research object, the effects of feed gas composition, feed gas pressure, Effect of temperature on the separation process. The results showed that with the increase of CH4 content in the feed gas, the permeation rate of CO2 decreased and the separation factor increased first. However, the separation factor started to decrease when the CH4 volume fraction was greater than 0.5. With the increase of feed gas pressure, the permeation rate of CO2 And the separation factor all showed a downward trend. With the increase of retentate flow rate, the permeation rate of CO2 remained stable and the separation factor increased slightly under different pressures and temperatures. The CO2 separation factor did not change at low pressure or low temperature Large, high pressure or high temperature, CO2 separation factor increased significantly.