以均苯四甲酸酐（PMDA）和二氨基二苯醚（ODA）为原料，通过改变反应时间和反应温度制得不同分子量的聚酰胺酸（PAA），然后通过原位掺杂NaY制得炭分子筛膜（CMSMs），用于CO₂分离性能研究。考察了前驱体分子量及无机填料对CMSMs气体分离性能的影响，同时测试了混合气分离性能，并研究了CMSMs的老化过程。结果表明，PMDA和ODA在0~5℃下反应6.5 h后合成的PAA分子量最大，为13.55×10⁴，其对应的CMSMs的CO₂渗透系数和CO₂/N₂选择性分别为291 Barrer和30.5。随着NaY含量的增加，CMSMs的CO₂渗透系数逐渐增加，而CO₂/N₂选择性先增大后减小；当NaY掺杂量为6%时，所制备的CMSMs的气体分离性能达到最优（CO₂渗透系数为699 Barrer，CO₂/N₂选择性为47.6）。混合气分离性能测试表明，CMSMs的气体分离性能略低于纯气。在70 d的老化测试中，CMSMs气体分离性能表现出良好的稳定性，表明其具有一定的工业应用价值。

Polyamic acid (PAA) with different molecular weights are prepared by changing the reaction time and reaction temperature with pyromellitic anhydride (PMDA) and diaminodiphenyl ether (ODA) as raw materials.NaY inorganic fillers are doped into the prepared PAA in situ to prepare carbon molecular sieve membrane (CMSMs),which is used for studying separation performance to CO₂.The effects of PAA molecular weight and NaY on the gas separation performance of CMSMs are investigated,and their separation performance for mixed gas is also tested.The aging process of CMSMs is investigated.Results indicate that PAA with the maximum molecular weight 13.55×10⁴ g·mol^-1 can be obtained if the reaction between PMDA and ODA occurs at 0-5℃ for 6.5 h.The permeability coefficient of CO₂ over CMSMs derived from PAA with the maximum molecular weight is 291 Barrer and the selectivity of CO₂/N₂ over that is 30.5.With the increasing of NaY loading,the permeability coefficient of CO₂ over CMSMs increases gradually while the selectivity of CO₂/N₂ by CMSMs increases firstly and decreases then.As the doping amount of NaY is 6wt%,the prepared CMSMs exhibits the optimal gas separation performance,with a CO₂ permeability coefficient of 699 Barrer and a CO₂/N₂ selectivity of 47.6.The separation performance of CMSMs to mixed gas is slightly lower than that to pure gas.In a 70-day aging test,CMSMs' gas separation performance shows a good stability,indicating that it has certain industrial application value.

李鑫(1992-),男,硕士生,研究方向为膜分离与技术,577797335@qq.com