Study of vapor-hydrate two-phase equilibria
Study of vapor-hydrate two-phase equilibria
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DOI：
10.1016/j.fluid.2008.01.001
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发表时间：
2008-03-25
影响因子：
2.6
通讯作者：
Zhang, L. -W.
中科院分区：
文献类型：
--
作者：
Ma, Q. -L.;Chen, G. -J.;Zhang, L. -W.
近年来，水合物分离技术越来越受到人们的重视，特别是轻质混合气的分离。我们进行了实验和模拟研究的系统包含氢，甲烷，乙烷和乙烯，有和没有热力学促进剂四氢呋喃（THF）在水中。测量了（H-2 + CH 4）、（H-2 + N-2 + CH 4）和（CH 4 + C2 H4）气体混合物在不存在和存在四氢呋喃的情况下的蒸气-水合物平衡数据（P-T-x-y数据）。采用一种相对简单的算法计算了气-水合物两相平衡。采用Patel-Teja状态方程，结合货车van der Waals-Platteeuw型水合物模型，计算了气相水合物的平衡闪蒸。通过关联水合物形成条件的实验数据，确定了水合物模型中的参数。此外，我们预测的组成的气体混合物中的水合物相时，结构I和结构II水合物共存的（CH 4 + C2 H6）气体混合物。实验结果表明，该算法能够较好地预测气-水合物平衡。准确预测气相和水合物相之间的单级平衡对于开发通过水合物形成的分离技术是重要的。(c)2008 Elsevier B. V.保留所有权利。
In recent years, the technology of separating gas mixtures by forming hydrate has received increasing recognition, particularly the separation of light-gas mixtures. We performed an experimental and modeling study of systems containing hydrogen, methane, ethane and ethylene, both with and without the thermodynamic promoter tetrahydrofuran (THF) in water. Vapor-hydrate equilibrium data (P-T-x-y data) were measured for (H-2 + CH4), (H-2 + N-2 + CH4) and (CH4 + C2H4) gas mixtures in the absence and presence of THF. A relatively simple algorithm was used to calculate vapor-hydrate two-phase equilibria. The Patel-Teja equation of state, coupled with a van der Waals-Platteeuw-type hydrate model, was applied to calculate the equilibrium flash of vapor-hydrate phases. The parameters in the hydrate model were determined by correlating the experimental data of hydrate formation conditions. In addition, we predicted the composition of gas mixture in the hydrate phase when structure I and structure II hydrates coexisted in a (CH4 + C2H6) gas mixture. The test results indicated that proposed algorithm is adequate for predicting vapor-hydrate equilibria. Accurate predictions of single-stage equilibrium between the vapor and the hydrate phases are important for developing separation technology via hydrate formation. (c) 2008 Elsevier B.V. All rights reserved.