热缩聚煤沥青压型制备分子筛炭膜──炭膜基板的制备（Ⅰ）

MANUFACTURING CARBON MOLECULAR SIEVE MEMBRANE FROM HEAT-TREATMENT COAL PITCH BY PRESSING(Ⅰ)──PREPARATING CARBON MEMBRANE SUBSTRATE

以一种热缩聚煤沥青为原料制务炭膜基板，考察了预氧化、炭化条件对炭膜基板的气体透过性和选择性的影响。结果表明：炭膜基板对ＣＯ_２／Ｈ_２及Ｎ_２／Ｈ_２有一定的分离能力，分离系数在３．０左右，气体的透过速率在１０^（－３）ｃｍ~３（ＳＴＰ）／（ｃｍ~２·ｓ·ｃｍＨｇ）数量级，同时，还考察了炭化温度对炭膜基板的机械强度、失重和收缩程度的影响。

Abstract Carbon membrane substrate was prepared from heat-poly coal pitch. The effects of pre-oxidition and carbonizing condition on gas permeability and selectivity through the substrate was tested. The results showed that the carbon membrane subslrate had a certain ability to separate CO_2/H_2 and N_2/H_2 whose separating factors were about 3.0. And the gas permeating rate was in magnitude of 10￣(-3) cm￣3(STP)/(cm￣2scmHg) Meanwhile, the effect of carbonizing temperature on weight loss and shrinkage of the substrate was also investigated.