화학공학소재연구정보센터
홈 로그인 로그아웃 연락처 사이트맵
HWAHAK KONGHAK, Vol.41, No.1, 26-32, February, 2003
Export Citation
아임계 및 초임계수하의 p-Xylene의 무촉매 부분 산화반응에서 반응조건이 Terephthalic acid의 선택성에 미치는 영향
Effects of Reaction Conditions on Selectivity of Terephthalic acid in Uncatalyzed Partial Oxidation of p-Xylene under Subcritical and Supercritical Water
김영래, 김재덕†, 임종성, 이윤우, 이성철1
  • 한국과학기술연구원 CFC 대체연구센터 초임계유체공정연구실, 136-791 서울시 성북구 하월곡동 39-1
  • 1한양대학교 화학공학과, 133-791 서울시 성동구 행당동 17
Young-Lae Kim, Jae-Duck Kim†, Jong Sung Lim, Youn-Woo Lee, and Sung-Chul Yi1
  • Supercritical Fluid Research Lab., CFC Altenatives Research Center, Korea Institute of Science and Technology, 39-1 Hawolgok-dong, Sungbuk-gu, Seoul 136-791, Korea
  • 1Department of Chemical Engineering, Hanyang University, 17 Haengdang-dong, Seongdong-gu, Seoul 133-791, Korea
E-mail:
초록
아임계와 초임계수 매체하에서 p-xylene을 과산화수소에 의해 무촉매로 부분 산화시켜 terephthalic acid(TPA)를 제조하는 가능성을 실험적으로 검토하였다. 회분식 반응실험을 통해 p-xylene의 전화율과 TPA의 선택성에 미치는 반응온도, 압력, 과산화수소의 주입비의 영향을 검토하였고, 반응생성물로부터 p-xylene의 새로운 산화 분해 경로를 제시하였다. 반응 시작 후 20분이 경과하였을 때 p-xylene의 전화율은 아임계수 조건에서 89.0% 이상이었고, 초임계수 조건에서는 99.0% 이상으로 온도가 높아질수록 증가하였다. TPA의 선택성은 초임계수 조건보다는 아임계수 조건에서 더 높았으며, 특히 온도 300 ℃, 압력 220 bar, 과산화수소 주입비 50%일 때 TPA 수율은 29.0%로 최대값을 나타내었다. 또한 TPA 선택성에 미치는 압력의 영향은 초임계수보다는 아임계수 조건에서 더 큰 것으로 나타났다.
The possibility of manufacturing the terephthalic acid(TPA) by partial oxidation of p-xylene without a catalyst in subcritical and supercritical water medium was investigated experimentally. The effects of reaction conditions such as reaction temperature, pressure and hydrogen peroxide feed ratio on the conversion of p-xylene and the selectivity of TPA produced were investigated in batch reactor and new oxidation reaction pathway of p-xylene was proposed. Conversion of p-xylene was about 89.0% in subcritical condition and increased with the temperature increasing, over 99.0% in supercritical condition after 20 minutes from the start of reaction. The selectivity of TPA in subcritical conditions was higher than in supercritical conditions and the maximum value was 29.0% at 300 ℃, 220 bar, 50% H2O2 feed ratio. The pressure effect on TPA selectivity was higher at subcritical water condition than that at the supercritical condition.
Keywords:Xylene;TPA;Supercritical;Oxidation
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