Korean Chemical Engineering Research

The Korean Institute of Chemical Engineers (한국화학공학회)
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Preparation of Porous Polypropylene Membrane by a Thermally Induced Phase Separation Method in Supercritical CO2

CO2 초임계 유체에서 열식법을 이용한 다공성 폴리프로필렌 막의 제조

  • Lee, Sang-Joon (Department of Chemical Engineering, Sungkyunkwan University) ;
  • Chung, Jaygwan G. (Department of Chemical Engineering, Sungkyunkwan University)
  • 이상준 (성균관대학교 화학공학과) ;
  • 정재관 (성균관대학교 화학공학과)
  • Received : 2004.06.28
  • Accepted : 2004.11.01
  • Published : 2005.02.28
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Abstract

Porous polypropylene membranes were prepared by a thermally induced phase separation method in super-critical $CO_2$, where polypropylene and Camphene were used as raw materials. The porosity of polypropylene membranes with 10 wt% polypropylene concentration was 78, 80, 73% by using methanol, ethanol, and n-buthanol as an analytical solvent, respectively. The tensile strength increased with an increasing polypropylene concentration, where it was $0.17kg_f/mm^2$ at 10 wt% polypropylene concentration. The extraction rate for Camphene increased with time and Camphene was removed 94% in 5 min. It increased with an increasing temperature and was 99% at $45^{\circ}C$, however, decreased with an increasing temperature at higher than $45^{\circ}C$. The extraction rate increased with an increasing pressue up to 150 bar, however, decreased slightly with an increasing pressure over 150 bar. The extraction rate had a relation with the solubility of Camphene in supercritical $CO_2$.

$CO_2$ 초임계 유체에서 열식법을 이용하여 폴리프로필렌과 켐펜을 혼합하여 다공성 폴리프로필렌 막을 제조했다. 폴리프로필렌 농도 10 wt%의 조건에서 제조된 폴리프로필렌 막의 공극률은 메탄올, 에탄올, n-부탄올에 따라 각각 78, 80, 73%였다. 폴리프로필렌의 농도가 증가할수록 인장강도는 높아졌으며 폴리프로필렌 농도가 10 wt% 일 때 인장강도는 $0.17kg_f/mm^2$였다. $CO_2$ 초임계 유체를 사용하여 켐펜을 추출한 결과 시간에 따라 추출속도가 증가하였으며 5분 경과 후 94% 제거되었다. 온도가 증가함에 따라 추출속도가 증가했으며 $45^{\circ}C$ 조건에서 99% 제거되었다. 그러나 그 이상의 높은 온도에서는 추출속도는 저하되었다. 150 bar의 압력까지는 압력이 증가함에 따라 켐펜의 추출속도는 증가하였으나, 그 이상의 압력 조건에서는 압력이 증가함에 따라 추출속도는 미소하게 감소했다. 추출속도는 $CO_2$ 초임계 유체의 켐펜에 대한 용해도 특성과 상관성이 있었다.

Keywords

References

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