화학공학소재연구정보센터
홈 로그인 로그아웃 연락처 사이트맵
Journal of the Korean Industrial and Engineering Chemistry, Vol.12, No.2, 212-217, April, 2001
Export Citation
고압에서 Poly(octadecyl methacrylate)-CO2 혼합물에 대한 상거동과 공용매의 효과
Cosolvent Effect and Phase Behavior of Poly(octadecyl methacrylate)-CO2 Mixtures at High Pressure
변헌수, 김근빈, 김낙현1, 곽철1, †
  • 여수대학교 화학공학과, 전남 550-749
  • 1경남대학교 정밀화학공학부, 마산 631-701
Hun Soo Byun, Kunbin Kim, Nak Hyun Kim1, and Chul Kwak1, †
  • Department of Chemical Engineering, Yosu National University, Chonnam 550-749, Korea
  • 1School of Fine Chemistry and Chemical Engineering, Kyungnam University, Masan 631-701, Korea
E-mail:
초록
고압에서 이성분계 CO2-octadecyl methacrylate (ODMA) 혼합물에 대해 압력-조성의 상거동 실험을 온도 50, 80, 110 및 130 ℃와 압력 22∼337 bar 의 범위에서 행하였다. 일정 압력에서 CO2에 대한 ODMA의 용해도는 온도가 증가함에 따라 증가함을 보였다. CO2-ODMA계의 실험결과를 Peng-Robinson 상태방정식에서 적용하였고, 온도에 독립적인 피라미터를 이용하여 구한 계산값을 실험값과 비교하였다. 순수 CO2와 ODMA의 임계온도와 실험 온도 사이에서 압력변화에 따라 CO2-ODMA 계의 임계궤적(critical locus)을 얻었고, 임계온도 구간에서 곡선은 최대값을 나타내었다. 또한 초임계 이산화탄소-poly(octadecyl methacrylate) (PODMA) ODMA의 3성분 혼합물에 대해 온도 35∼254 ℃, 압력 1946 bar까지, 그리고 공용매 ODMA 농도 10.2, 23.2, 29.7, 39.3 및 49.7 wt%에서 상거동 자료들을 얻었다. 공용매의 농도 증가에 따라 위아래임계용해온도(U-LCST) 영역으로부터 아래임계용해온도(LCST) 영역까지의 상거동 곡선에서 압력-온도 기울기의 변화를 관찰하였다. PODMA-CO2 혼합물에 ODMA이 농도가 51.7 wt%일 때 삼상(LLV)이 나타났다. PODMA는 온도 255 ℃, 압력 2700 bar에서도 순수 CO2에 용해되지 않았다.
Pressure-composition isotherms were measured for the CO2-octadecyl methacrylate (ODMA) at 50, 80, 110 and 130 ℃ and at pressures from 22 to 337 bar. The solubility of ODMA in the CO2-ODMA mixture increased as the temperature increased at constant pressure. The experimental results for the CO2-ODMA mixture were correlated using Peng-Robinson equation of state with temperature-independent parameters. The experimental data were compared with the calculated data by the Peng-Robinson equation of state for the CO2-ODMA mixture. The CO2-ODMA mixture had continuous critical mixture curves that shows maximum pressures at temperatures between the critical temperatures of CO2 and ODMA. Phase behavior data for ternary poly(octadecyl methacrylate) (PODMA)-CO2-ODMA were measured in the temperature range from 35 to 254 ℃ and pressures up to 1946 bar. The cosolvent(ODMA) concentrations were 10.2, 23.2, 29.7, 39.3 and 49.7 wt%. The mixture changed the pressure-temperature slope of the phase behavior from U-LCST region to LCST region as the cosolvent concentration increased. The addition of 51.7 wt% ODMA to PODMA-CO2 mixture showed LLV phase behavior. The PODMA did not dissolve in pure CO2 even at 255 ℃and 2700 bar.
Keywords:Poly(octadecyl methacrylate)-CO2-octadecyl methacrylate system;Cosolvent effect;CO2-octadecyl methacrylate system;Phase behavior
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