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7663512 
Journal Article 
Study on molecular weight cut-off performance of asymmetric aromatic polyimide membrane 
Ohya, H; Okazaki, I; Aihara, M; Tanisho, S; , 
1997 
Yes 
Journal of Membrane Science
ISSN: 0376-7388 
ELSEVIER SCIENCE BV 
AMSTERDAM 
123 
1 
143-147 
English 
WOS:A1997WD04600016 
Asymmetric aromatic polyimide membranes for a petroleum refinery were made by casting solution of 18 wt.% polyamic acid blending of the trade name Pyle-ML5057 (Du Pont Co.) and PMDA-DABP in the ratio of 1:1 and 20 wt.% phenanthrene in dimethylacetamide at 303-363 K, with 1 and 3-min evaporation times, followed by a cycle process of thermal treatment in a bath of dioctyl sebacate under N-2 in three steps: 1 h at 373 K, 1 h at 473 K and 1 h at 573 K. The asymmetric aromatic polyimide membranes fabricated with combinations of preparation conditions had a molecular weight (MW) cut-off ranging from 170 to 400 Da. The membrane which has a MW cut-off of 170 Da succeeded in separating the gasoline-kerosine mixtures. A separation factor (for gasoline/kerosene) of 19.5 was obtained. 
Asymmetric membrane; Hydrocarbon; Petroleum refinery; Polyimide; Ultrafiltration membrane