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Method for dehumidifying humid gas mixtures using ionic liquids

  • US 10,500,540 B2
  • Filed: 06/28/2016
  • Issued: 12/10/2019
  • Est. Priority Date: 07/08/2015
  • Status: Active Grant
First Claim
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1. A process for dehumidifying a moist gas mixture G in an apparatus V1, comprising the steps of:

  • (a) contacting the moist gas mixture G with a liquid absorption medium AVE comprising at least one salt selected from the group consisting of;

    Q+(RO)2PO2

    ;

    (Q+)2ROPO32−

    ; and

    Q+M+ROPO32−

    ;

    wherein the liquid absorption medium AVE at least partially absorbs water from the moist gas mixture G, to obtain a liquid absorption medium AVE1 having an elevated water content compared to the liquid absorption medium AVE and a gas mixture G1 having a relatively low water content compared to the moist gas mixture G;

    (b) at least partially removing water from the liquid absorption medium AVE1 to obtain a liquid absorption medium AVE2 having a relatively low water content compared to the liquid absorption medium AVE1;

    wherein the apparatus V1 at least partially comprises a surface made of an aluminium material of construction OAl and in the apparatus V1, at least one of the liquid absorption media selected from the group consisting of AVE, AVE1, AVE2 contacts the surface made of OAl via at least one contact surface;

    and wherein;

    Q+ is a 1,3-dialkylimidazolium in which the alkyl groups are, independently of one another, unbranched or branched C1-C6 alkyl groups;

    R is an unbranched or branched C2-C6 alkyl group;

    and M+ is an alkali metal ion.

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