양친매성 2-butoxyethanol과 물 혼합계에서의 과잉 엔탈피 및 활동도 계수

• 영문명: Excess Enthalpies and Activity Coefficients for the Binary Nonionic Amphiphile 2-Butoxyethanol/Water System
• 발행기관: 한국응용과학기술학회 (구.한국유화학회)
• 저자명: 임경희(Kyung Hee Lim)
• 간행물 정보: 『한국응용과학기술학회지』한국유화학회지 제17권 제2호, 132~138쪽, 전체 7쪽
• 주제분류: 공학 > 화학공학
• 파일형태: PDF
• 발행일자: 2000.06.30

영문 초록

Excess enthalpies (HE) were measured by isothermal flow calorimetry for the nonionic amphiphile 2-butoxyethanol/water mixtures at 10 different temperatures (48.5 to 70℃) around and above the lower consolute solution temperature, Tlc·HE exhibits U-shape for the binary mixtures, and is large and negative which reflects substantial interaction between two chemical species. When the commonly used, semi-empirical Redlich-Kister (RK) polynomials were fitted to the measured HE, plots of HE vs. weight fraction provided more accurate fitting with fewer parameters than conventionally drawn HE vs. mole fraction plots. This was due to the enhanced symmetry of HE vs. weight fraction plots. Using the fitted Redlich-Kister polynomials and the Gibbs-Helmholtz relation, temperature dependence of the activity coefficients were found and compared to the values determined from vapor-liquid equilibria. The activity coefficients were in the range of one to three, indicating that the binary system deviates from ideality but not substantially. They slightly depended on temperature and the temperature effect was equivalent to 10 % change in the activity coefficients.

목차

Abstract

1. 서론

2. 실험

3. HE에 대한 Fitting 식

4. 결과 및 고찰

5. 결론

감사

참고문헌

키워드

Excess enthalpy Partial molar enthalpy Redlich-Kister polynomial LLE phase composition Activity coefficient