New Insights into Pervaporation Mass Transport under Increasing Downstream Pressure Conditions: Critical Role of Inert Gas Entrance
New Insights into Pervaporation Mass Transport under Increasing Downstream Pressure Conditions: Critical Role of Inert Gas Entrance
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DOI：
10.1021/ie000921i
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发表时间：
2001-02
影响因子：
4.2
通讯作者：
C. Vallières;É. Favre;D. Roizard;J. Bindelle;D. Sacco
中科院分区：
文献类型：
--
作者：
C. Vallières;É. Favre;D. Roizard;J. Bindelle;D. Sacco
下游总压力对纯化合物通过致密聚合物膜的渗透汽化通量的影响最近一直是有争议的话题。支持溶液−扩散模型或新提出的孔隙流模型的实验论点在不同的系统上交替地被报道。为了严格地重新审视这一争论，在受控下游条件下对纯甲醇和纯异丙醇通过聚二甲基硅氧烷膜渗透汽化进行了实验研究，后者先前已被报道遵循孔流模型预测。结果表明，只要适当考虑装置内空气泄漏的影响，用经典的Solution−扩散模型可以合理地分析下游压力对计算结果的影响。在此基础上，讨论了惰性气体的贡献对渗透汽化操作的影响。
The influence of the total downstream pressure on the pervaporation flux of a pure compound through a dense polymer membrane has been the subject to controversial debates recently. Experimental arguments in favor of either the solution−diffusion model or the newly proposed pore-flow model are alternatively reported on different systems. To critically reexamine this debate, an experimental study under controlled downstream conditions has been performed for pure methanol and pure 2-propanol pervaporation through a poly(dimethylsiloxane) film, the latter having been previously reported to follow pore-flow model predictions. It is shown that a rational analysis of the effects of the downstream pressure on the results can be achieved according to the classical solution−diffusion model, provided that the influence of air leaks in the installation is properly taken into account. Based on this observation, the implications of an inert gas contribution, generally speaking, on pervaporation operation are discussed.