Heat supply and reduction of polarization effects in pervaporation by two-phase feed

J. Fontalvo, M.A.G. Vorstman, J.G. Wijers, J.T.F. Keurentjes

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    21 Citations (Scopus)
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    Abstract

    Gas- and vapor-liq. two-phase pervaporation was exptl. studied using a lab. scale and a bench scale pervaporation setup. Pervaporation expts. with low liq. flow rates in internally coated tubes were carried out for dewatering of 1,4-dioxane and iso-Pr alc. Relatively small amts. of gas or vapor are sufficient to reduce concn. and temp. polarization and to increase the total flux and selectivity more than two-fold compared with single-phase expts. The beneficial effects of a two-phase feed are also demonstrated by calcns. Addnl., by condensation the vapor effectively supplies the heat required for the selective evapn. through the membrane. As a consequence, this eliminates the liq. temp. drop that reduces the performance of pervaporation modules. The values of the total flux achieved using vapor-liq. two-phase pervaporation at laminar flow conditions are close to those for turbulent conditions. [on SciFinder (R)]
    Original languageEnglish
    Pages (from-to)156-164
    Number of pages9
    JournalJournal of Membrane Science
    Volume279
    Issue number1-2
    DOIs
    Publication statusPublished - 2006

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