Pervaporation of Water/ethanol Mixtures Using PVA Membranes Crosslinked with Poly (styrene-maleic anhydride): Study on the Separation Behavior

Poly (styrene-maleic anhydride)로 가교된 Poly (vinyl alcohol)막을 이용한 물/에탄올 수용액의 투과증발: 분리거동에 관한 연구

  • 김상균 (전남대학교 고분자공학과) ;
  • 임균택 (전남대학교 고분자공학과) ;
  • 박상욱 (부산대학교 화학공학과)
  • Received : 1997.07.14
  • Accepted : 1998.04.22
  • Published : 1998.08.10

Abstract

Poly (vinyl alcohol) (PVA) membranes crosslinked with poly (styrene-co-maleic anhydride) (PSMAn) have been prepared by the solution method. To investigate the separation behavior of the crosslinked PVA/PSMAn membranes in the pervaporation process, the selective sorption experiment and swelling measurements of the membranes in ethanol-water mixtures of 30~90 wt % ethanol contents were conducted with equipment that was able to measure the concentration and amount of the liquid absorbed in the membranes. The membranes prepared in this study exhibited good selectivity toward water component in sorption and permeation. Also, in the feed containing ethanol more than 50 wt %, the permeation selectivity of the membrane showed better correlation with the sorption selectivity than that with the swelling ratio changing toward the crosslinking content. This behavior was consistence with a solution-diffusion model correlating permeation and sorption selectivity, and led to the conclusion that the permeation selectivity was determined by sorption step rather than by diffusion step in the membrane.

Keywords

Pervaporation;Ethanol-water Mixture;Poly(vinyl alcohol);Solution-diffusion Model