改性石墨烯材料掺杂聚酰亚胺制备混合基质膜分离CO_(2)/N_(2)

Preparation of mixed matrix membrane with modified graphene doped polyimide for CO_(2)/N_(2)separation

海洋石油生产平台日常产生大量CO_(2)温室气体,对其进行分离捕集并回注地层,可有效改善原油流动性,提高原油产收率,产生可观的经济效益及环保社会效益.聚酰亚胺(PI)是目前最具有应用价值的气体分离膜材料,因受Robeson上限的限制,很难同时满足高渗透系数和高选择性的要求.使用氧化石墨烯(GO)和还原氧化石墨烯(rGO)对聚酰亚胺进行掺杂制备混合基质膜,进行了CO_(2)/N_(2)气体分离的实验研究.结果表明,制备的氧化石墨烯掺杂的聚酰亚胺混合基质膜(PI-GO)和还原氧化石墨烯掺杂的聚酰亚胺混合基质膜(PI-rGO)相比于纯聚酰亚胺膜,分离性能明显提升;对比混合气干湿态气体渗透性能,混合气湿态时PI-rGO膜的渗透系数和分离因子分别上升了13.52%和24.34%.

A large amount of CO_(2) greenhouse gas is produced by offshore oil production platform daily.The separation and capture of CO_(2) greenhouse gas and its reinjection into the formation can effectively improve the liquidity of crude oil,increase the yield of crude oil,produce considerable economic benefits and environmental protection social benefits.Polyimide is the most valuable gas separation membrane material at present.Because of Robeson upper limitation,the commercially available polymeric membranes often have either high permeability or high selectivity,but not both together.In this paper,polyimide was doped with self-made graphene oxide and reduced graphene oxide to prepare mixed matrix membrane,and the experimental study of CO_(2)/N_(2) gas separation was carried out.The results show that the separation performance of the prepared graphene oxide doped polyimide mixed matrix membrane(PI-GO)and reduced graphene oxide doped polyimide mixed matrix membrane(PI-rGO)are significantly improved compared with the pure polyimide membrane;the permeability coefficient and separation factor of the PI-rGO are increased by 13.52%and 24.34%respectively.