High-pressure experimental vapour-liquid-liquid equilibrium measurements and modelling for natural gas processing: Equipment validation, and the system CH4+nC6H14+H2O

被引：1

作者：

Kruger, Francois ^{[1
]}

Varsos, Athanasios A. ^{[1
]}

Kontogeorgis, Georgios M. ^{[1
]}

von Solms, Nicolas ^{[1
]}

机构：

[1] Tech Univ Denmark DTU, Dept Chem & Biochem Engn, Ctr Energy Resources Engn, DK-2800 Lyngby, Denmark

来源：

FLUID PHASE EQUILIBRIA | 2019年 / 501卷

关键词：

Experimental phase equilibrium data; VLE; VLLE; Cubic-plus-association; sPC-SAFr; EQUATION-OF-STATE; MOLECULAR-BASED EQUATIONS; PHASE-EQUILIBRIUM; ETHYLENE-GLYCOL; PC-SAFT; BINARY-MIXTURES; DEW POINTS; PART; WATER; METHANE;

D O I：

10.1016/j.fluid.2019.112276

中图分类号：

O414.1 [热力学];

学科分类号：

摘要：

Despite its relevance for oil and gas separation processes, surprisingly few experimental three-phase data are available in the open literature for gas-condensate-water systems. In support of proposed subsea processing facilities, a three-phase equilibrium measurement apparatus has been recommissioned for the measurement of C-1+nC(6)+H2O systems between 303 and 323 K. The apparatus has been validated by comparison with literature VLE data for C-1+H2O and C-1+nC(6), with the experimental uncertainty estimated at +/- 9% (95% confidence interval). 81 new three-phase C-1+nC(6)+H2O data points have been generated for three different feed mixtures. The relative compositions in each phase are strongly correlated to the experimental feed composition, while the solubility-temperature trends indicate complex interactions in the system. The repeatability of the measurements ranges from below 1% for major components up to 10-20% for trace components in the respective phases. Experimental standard deviations are comparable with those reported for literature data. The data have been modelled using the CPA and sPC-SAFE equations of state. Satisfactory results were achieved for major components (accuracy between 1 and 6%), while order of magnitude errors were observed for certain trace components (e.g. water in the HC-rich phase). Overall, sPC-SAFT provided slightly better predictions compared to the CPA, but the differences are rather modest. (C) 2019 Elsevier B.V. All rights reserved.

引用

页数：13