HWAHAK KONGHAK, Vol.12, No.2, 65-74, April, 1974
무한희석에 있어서 활성도 계수의 추정
Prediction of Activity Coefficient at Infinite Dilution
초록
포화탄화수소, 불포화탄화수소내 방향족탄화수소의 무한희석에서 활성도 계수를 순수액체의 물성으로부터 추정할 수 있는 새로운 식을 제안하였다. 원래 Scatchard-Hildebrand와 Flory-Huggins의 식으로부터 Weimer-Prausnitz가 유도하고 Helpinstill-Winkle가 수정한 관계식을 Wilson의 국소용적분율의 개념을 도입하여 더욱 발전시켰다. 이 상관관계를 도출하는데 180여 탄화수소 2성분계 데이타를 사용하였으며 140여 성분계에 대한 무한희석에서 활성도계수를 추정하여 문헌치와 비교한 결과 Helpinstill-Winkle의 방법보다 오차가 적다는 것이 입증되었다.
A correlation that is suitable for predicting infinite dilution binary activity coefficients of saturated, unsaturated and aromatic hydrocarbons from the pure physical constants of their components is presented.
The original equation was obtained by Weimer and Prausnitz by using the Scatchard-Hildebrand and Flory-Huggins activity equation. The equation was then revised by Helpinstill-Winkle and the present study improved it further by introducing the concept of Wilson's local volume fraction.
Data from over 180 binary hydrocarbon solvent systems were used to improve the correlation. The calculated infinite dilution activity coefficients were compared with those predicted by Helpinstill-Winkle. It has been proved that the new expression was more satisfactory in prodicting the infinite dilution activity coefficients.
The original equation was obtained by Weimer and Prausnitz by using the Scatchard-Hildebrand and Flory-Huggins activity equation. The equation was then revised by Helpinstill-Winkle and the present study improved it further by introducing the concept of Wilson's local volume fraction.
Data from over 180 binary hydrocarbon solvent systems were used to improve the correlation. The calculated infinite dilution activity coefficients were compared with those predicted by Helpinstill-Winkle. It has been proved that the new expression was more satisfactory in prodicting the infinite dilution activity coefficients.