费托合成反应体系的气液平衡研究进展

Research Progress in Vapor-Liquid Equilibrium of Fischer-Tropsch Synthesis System

对费托合成反应体系的气液平衡研究进展进行了归纳和分析,对该体系的物质进行了分类,讨论了不同计算方法的适用性和计算准确性.可将体系划分为烃类产物和小分子气体两部分,烃类产物又可分为C18以下的轻质烃类和C18以上的重质烃类.在兼顾计算准确性和简单性的前提下,C18及以下的轻质烃类的气液平衡可采用Raoult定律计算,重质烃类由于存在扩散限制作用,其气液平衡可通过状态方程计算,PR方程计算结果准确性较高.小分子气体的溶解平衡计算较多应用Henry定律法和状态方程法,Henry定律法计算过程较简单且准确性较高.

The recent research progress in vapor-liquid equilibrium（VLE） of Fischer-Tropsch synthesis（FTS） system is reviewed and analyzed.And the accuracies of calculation methods are discussed.FTS system can be divided into two sections,hydrocarbon products and small molecule gases.The former can be further divided into light hydrocarbon products with the carbon number lower than 18 and heavy ones greater than 18.The VLE of hydrocarbon products and the dissolution equilibrium of the small molecule gases are reviewed respectively.From the points of accuracy and simplicity of the calculation methods,the VLE of light hydrocarbon products can be described by Raoult＇s law.Due to diffusion limitation,the VLE of heavy hydrocarbon products can be calculated by the EOS（equation of state） methods,among which PR EOS is widely used with good accuracy.Henry＇s law and EOS method are all applied in the dissolution equilibrium calculation of small molecule gases.And Henry＇s law is more suitable to description of the dissolution equilibrium of small molecule gases.