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J Hazard Mater

Title:		Microporous polyimide VOC-rejective membrane for the separation of nitrogen/VOC mixture
Author(s):		Zhang C; Gao X; Qin J; Guo Q; Zhou H; Jin W;
Address:		"State Key Laboratory of Materials-Oriented Chemical Engineering, College of Chemical Engineering, Nanjing Tech University, 30 Puzhu Road(S), Nanjing 211816, PR China. State Key Laboratory of Materials-Oriented Chemical Engineering, College of Chemical Engineering, Nanjing Tech University, 30 Puzhu Road(S), Nanjing 211816, PR China. Electronic address: zhouhl@njtech.edu.cn"
Journal Title:		J Hazard Mater
Year:		2021
Volume:		20200902
Issue:
Page Number:		123817 -
DOI:		10.1016/j.jhazmat.2020.123817
ISSN/ISBN:		1873-3336 (Electronic) 0304-3894 (Linking)
Abstract:		"The treatment of VOCs (volatile organic compounds) in waste streams is very important. Herein, we propose to use a network microporous polyimide (PI) membrane for the molecular sieving of nitrogen over VOC molecules to control their emission. 2,6,14-triaminotriptycene (Trip) was reacted with aromatic dianhydride monomers, such as 3,3',4,4'-benzophenone tetracarboxylic dianhydride (BTDA), to synthesize ultramicroporous polyimides, which readily form composite membranes via solution coating. The properties of the PIs were characterized by X-ray photoelectron spectroscopy (XPS), Brunner-Emmet-Teller (BET) analysis, etc., which validated the formation of a network structure and ultramicroporosity in these polyimides. Therefore, the outstanding separation performance for the separation of nitrogen over VOCs, such as cyclohexane, by molecular sieving was obtained by using these membranes; a rejection higher than 99 % was realized with a permeability of approximately 2000 approximately 2600 Barrer under a temperature of 25 degrees C and feed concentration of 30,000 +/- 2000 ppm. Finally, the stability of the Trip-BTDA-PI membrane over time was studied"
Keywords:		Microporous polyimide Molecular sieving Network structure VOC-rejective membrane Volatile organic compounds;
Notes:		"PubMed-not-MEDLINEZhang, Chi Gao, Xue Qin, Jinchao Guo, Qingkai Zhou, Haoli Jin, Wanqin eng Research Support, Non-U.S. Gov't Netherlands 2020/12/02 J Hazard Mater. 2021 Jan 15; 402:123817. doi: 10.1016/j.jhazmat.2020.123817. Epub 2020 Sep 2"