Local Composition Model for the Phase Equilibrium, Phase Densities and Surface Tensions of Hydrocarbon-Hydrocarbon and Hydrocarbon-CO2 Mixtures
首发时间:2013-10-28
Abstract:Phase equilibrium, phase densities and surface tensions of hydrcaorbon-hydrocarbon (HC-HC) and hydrocarbon-CO2 (HC-CO2) vapor-liquid system have great importance in separation, purification and dissolution processes. In this work, a local composition model was introduced into the volume translated Peng-Robinson(VTPR) equation of state(EOS) to calculate the phase equilibrium and phase densities. And then the local composition combined with VTPR EOS was used to predict the surface tensions based on the gradient theory. The results show that the introduction of the local composition model can achieve accurate calculation of phase equilibrium, phase densities and surface tensions for binary HC-HC and HC-CO2 mixtures.
keywords: phase equilibrium phase densities surface tension local composition hydrocarbon carbon dioxide
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当地组分模型计算碳氢-碳氢和碳氢-二氧化碳混合物的相平衡、相密度和表面张力
摘要:碳氢-碳氢和碳氢-二氧化碳气液相体系的相平衡、相密度和表面张力在分离、纯化和溶解等领域有非常重要的应用。本文将当地组份模型引入VTPR状态方程计算相平衡和预测相密度。之后,将当地组份模型与VTPR状态方程和密度梯度理论结合对表面张力进行了预测。结果表明,当地组份模型的引入可以实现对碳氢-碳氢,碳氢-二氧化碳体系相平衡的精确计算、同时对相密度和表面张力有很好的预测效果。
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当地组分模型计算碳氢-碳氢和碳氢-二氧化碳混合物的相平衡、相密度和表面张力
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