กฎของการผสมที่ถูกปรับแปลงให้ใช้กับสมการสถานะเปง-โรบินสัน สำหรับสารผสมโอเลฟิน 2 องค์ประกอบ / ต่อศักดิ์ ทองสุกดี = A reformulated mixing rule applied to the Peng-Robinson equation of state for two-component olefinic mixtures / Torsak Thongsukdee
The objective of this research was to study and examine the Wong-Sandler mixing rule with the Peng-Robinson equation of state for prediction of thermodynamic properties of binary olefinic mixtures. The mixing rule considered here is a model, which takes into account the activity coefficient of mixture therefore it can well predict the thermodynamic properties of the mixture even in liquid phase. However, the mixing rule is composed of 4 parameters similar to those of the NRTL activity coefficient model, which can be obtained from the vapor-liquid equilibrium data of the mixture. Then, a computer program with a database system for searching and prediction the thermodynamic properties of binary olefinic mixtures based on the mixing rule model was developed. The examination of the properties predicted by the developed program by comparison with reference data and those obtained from a commercial simulation package shows that the mixing rule employed in this work can comparatively well predict the thermodynamic properties of binary olefinic mixture. It is found that the average relative difference of bubble point pressure is lower than 2%, 1% for mole fraction in vapor phase, 6% for compressibility factor, 5.5% for mixture volume, 3.5% for enthalpy change and 1% for entropy change.
