CIESC Journal ›› 2009, Vol. 60 ›› Issue (6): 1367-1372.
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DONG Lihua;HAO Xu;CAO Liren;LI Yongwang
Online:
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董立华;郝栩;曹立仁;李永旺
Abstract:
Two alpha functions (BM, SRW) and three different mixing rules (MHV2, WS, HG) for the PR and RKSEOS were investigated in the vaporliquid equilibrium calculation of related binary systems for FischerTropsch synthesis oil systemFurthermore, 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 investigatedThe results showed that various prediction methods had similar deviations for weakly polar systemsHowever, these method had different prediction abilities for other systemsUNIF-DMD, RKS-HG and RKS-MHV2 models gave more accurate prediction for nonassociating 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 RKSHG took the second placePC-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
费托合成,
摘要: 比较了基于不同α函数(BM、SRW)和不同混合规则(MHV2、WS、HG)的PR、RKS状态方程,SR-POLAR和PC-SAFT状态方程,以及UNIF-DMD和UNIF-HOC活度系数方程在费托合成油品体系预测汽液平衡的能力。结果表明:对于弱极性体系,各种计算方法结果接近,偏差均较小;对于非缔合极性体系,UNIF-DMD、RKS-MHV2和RKS-HG方程计算结果比较准确;对于含水缔合极性体系,RKS-MHV2方程和UNIF-HOC方程计算结果比较准确;含酸缔合体系,UNIF-HOC方程和SR-POLAR方程显示了最准确的预测能力;其他缔合极性体系,UNIF-HOC方程和SR-POLAR仍然显示了最高的计算精度,RKS-MHV2和RKS-HG次之;PC-SAFT缺少交互参数时,非均匀体系计算偏差较大。
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
DONG Lihua, HAO Xu, CAO Liren, LI Yongwang. Evaluation of vapor-liquid equilibrium prediction methods for related binary systems of Fischer-Tropsch synthesis oil syst[J]. CIESC Journal, 2009, 60(6): 1367-1372.
董立华, 郝栩, 曹立仁, 李永旺. 费托合成油品体系相关二元物系汽液平衡预测方法的评价 [J]. 化工学报, 2009, 60(6): 1367-1372.
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