Method for dehumidifying humid gas mixtures using ionic liquids
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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Abstract
The invention relates to a process for dehumidifying a moist gas mixture. The invention further relates to an apparatus for dehumidifying a moist gas mixture and to the use of said apparatus in the process according to the invention.
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Citations
20 Claims
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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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. An apparatus V2 for dehumidifying a moist gas mixture, comprising the components:
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a) a liquid absorption medium AVO comprising at least one salt selected from the group consisting of;
Q+(RO)2PO2−
;
(Q+)2ROPO32−
; and
Q+M+ROPO32−
;b) at least one water absorption unit Wabs2 for contacting the moist gas mixture with the liquid absorption medium AVO; c) at least one water desorption unit Wdes2 which comprises a heat exchanger Wx2 and is set up for at least partially removing water from a liquid absorption medium AVO; and d) a circuit U2 which connects the water absorption unit Wabs2 with the water desorption unit Wdes2 and by means of which the liquid absorption medium AVO may be circulated; wherein at least one of the components Wabs2, Wdes2, and U2 at least partially comprises a surface made of an aluminium material of construction OAl; and wherein disposed in the apparatus V2 is at least one contact surface at which the liquid absorption medium AVO contacts the surface made of OAl; and wherein; Q+ is a 1,3-dialkylimidazolium where 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. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification