Process and absorbent for dehumidifying moist gas mixtures
AssigneeEvonik Degussa GmbH
InventorsOlivier Zehnacker, Benjamin Willy
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Abstract
The invention relates to a process for dehumidifying a moist gas mixture in which the moist gas mixtures are brought into contact with an absorbent comprising dialkylimidazolium salts and trialkyl phosphate. In addition, the invention also relates to an absorption heat pump comprising the absorbent according to the invention and to the absorbent according to the invention itself.
Claims20
A process for dehumidifying a moist gas mixture G1, wherein the moist gas mixture G1 is contacted with a liquid absorption medium A1, which comprises a mixture of at least one trialkyl phosphate of structure (I):
- and at least one salt S selected from the group consisting of Q+A−, Q+(R1O)2PO2−, (Q+)2R2OPO32−, and Q+M+R3OPO32−, to obtain a gas mixture G2 which has a lower water content compared to the moist gas mixture G1 and a liquid absorption medium A2 which has an elevated water content compared to the liquid absorption medium A1;
- wherein:
- a) Q+ is a dialkylimidazolium cation;
- b) A−is an anion selected from the group consisting of R*COO−, R′SO3−, HSO4−, and R″SO4−;
- c) R*, R′, R″, RA, RB, RC are each independently an alkyl group;
- d) R1, R2, R3 are each independently an alkyl group;
- and
- e) M+is an alkali metal ion.
An apparatus V2 for dehumidifying a moist gas mixture, comprising the components:
- (i) a liquid absorption medium A1*, which comprises a mixture of at least one trialkyl phosphate of structure (I):
- and at least one salt S selected from the group consisting of Q+A−, Q+(R1O)2PO2−, (Q+)2R2OPO32−, and Q+M+R3OPO32−;
- (ii) at least one water absorption unit Wabs2 set up for contacting the moist gas mixture with the liquid absorption medium A1*;
- (iii) 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 A1*;
- (iv) and 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 A1* may be circulated;
- wherein:
- Q+ is a dialkylimidazolium cation;
- A−is an anion selected from the group consisting of R*COO−, R′SO3−, HSO4−, and R″SO4−;
- R*, R′, R″, RA, RB, and RC are each independently an alkyl group;
- R1, R2, and R3 are each independently an alkyl group;
- and
- M+is an alkali metal ion.
An absorption medium A1*, comprising a mixture of at least one trialkyl phosphate of structure (I):
- and at least one salt S selected from the group consisting of:
- Q+A−, Q+(R1O)2PO2−, (Q+)2R2OPO32−, and Q+M+R3OPO32−;
- wherein:
- a) Q+ is a dialkylimidazolium cation;
- b) A−is an anion selected from the group consisting of R*COO−, R′SO3−, HSO4−, and R″SO4−;
- c) R*, R′, R″, RA, RB, RC, R1, R2, and R3 are each independently an alkyl group;
- and
- d) M+is an alkali metal ion.
Dependencies are inferred from the claim text.