关键词:

费托合成, 汽液平衡, 状态方程, α函数, 混合规则, 活度系数方程

Abstract:

Two alpha functions (BM, SRW) and three different mixing rules (MHV2, WS, HG) for the PR and RKSEOS were investigated in the vaporliquid equilibrium calculation of related binary systems for FischerTropsch synthesis oil systemFurthermore, two different equations of states (EOS) of SR-POLAR and PC-SAFT, together with two activity coefficient equations of UNIF-DMD and UNIF-HOC were investigatedThe results showed that various prediction methods had similar deviations for weakly polar systemsHowever, these method had different prediction abilities for other systemsUNIF-DMD, RKS-HG and RKS-MHV2 models gave more accurate prediction for nonassociating strongly polar system, RKS-MHV2 and UNIF-HOC models showed the smallest deviation for associating strongly polar system containing water, UNIF-HOC and SR-POLAR models showed the smallest deviation for associating strongly polar system containing acids, and UNIF-HOC, SR-POLAR models showed the smallest deviation for other associating strongly polar systems, while RKS-MHV2 and RKSHG took the second placePC-SAFT model would bring big deviation for unsymmetrical system when binary parameters were lacking, but would give small deviation for all systems when binary parameters were available.

Key words:

费托合成, 汽液平衡, 状态方程, α函数, 混合规则, 活度系数方程