摘要
膜法是近十余年来发展起来的一种新型分离技术,是分离混合气体最为节能的方法。其关键是气体膜分离器,它的分离特性、使用条件和寿命主要取决于膜材料的选择。目前工业上使用的高分子气体分离膜材料主要有聚砜、醋酸纤维素、改性聚苯醚、改性聚硅氧烷、
Gas permeabilities and permselectivities for gas pairs H_2/N_2 and O_2/N_2 through a series of aromatic polyimide membranes, which were prepared from four different dianhydrides (e. g. BPDA, BTDA, TDPA, and DSDA) and two kinds of diamines (e. g. ODA and MDA), have been investigated. Systematic variations in chemical structure were found to lead to significant changes in permeability and permselectivity. The polyimide membranes based on BPDA with low permeability have the highest H_2/N_2 and O_2/N_2 separation factors. The polyimide membranes based on DSDA have simultaneously higher permeability and higher permselectivity.
出处
《应用化学》
CAS
CSCD
北大核心
1992年第4期87-90,共4页
Chinese Journal of Applied Chemistry
