Back to results
US 2017/0354924 A1Published application
Process for dehumidifying moist gas mixtures
AssigneeEvonik Degussa GmbH
InventorsMuhammad Irfan, Jörn Rolker, Rolf Schneider
Life of this patent
Estimating the term…
Abstract
The invention relates to a process for dehumidifying a moist gas mixture and to the absorption medium used in the process. 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.
Claims20
A process for dehumidifing a moist gas mixture G1, comprising:
- contacting the moist gas mixture G1 with a liquid absorption medium A1, wherein A1 comprises a mixture of triethylene glycol 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 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 in which the alkyl groups each independently of one another have 1 to 6 carbon atoms;
- b) A− is an anion selected from the group consisting of acetate, propionate, R′SO3−, HSO4−, and R″SO4−, wherein R′ and R″ are each independently of one another an alkyl group having 1 to 6 carbon atoms;
- c) R1, R2 and R3 are each independently of one another an alkyl group having 1 to 6 carbon atoms;
- and
- d) M+ is an alkali metal ion;
- with the proviso that the salt S is not dimethylimidazolium methylsulfonate.
7 more elements
An apparatus V2 for dehumidifying a moist gas mixture, comprising the components:
- a liquid absorption medium A1* which comprises a mixture of triethylene glycol and at least one salt S selected from the group consisting of:
- Q+A−, Q+(R1O)2PO2−, (Q+)2R2OPO32−, 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 in which the alkyl groups each independently of one another have 1 to 6 carbon atoms;
- A− is an anion selected from the group consisting of acetate, propionate, R′SO3−, HSO4−, and, R″SO4−, wherein R′ and R″ are each independently of one another an alkyl group having 1 to 6 carbon atoms;
- R1, R2 and R3 are each independently of one another an alkyl group having 1 to 6 carbon atoms;
- and
- M+ is an alkali metal ion;
- with the proviso that the salt S is not dimethylimidazolium methylsulfonate.
9 more elements
An absorption medium comprising a mixture of triethylene glycol 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 in which alkyl groups each independently of one another have 1 to 6 carbon atoms;
- b) A− is an anion selected from the group consisting of:
- acetate, propionate, R′SO3−, HSO4−, and R″SO4−, wherein R′ and R″ are each independently of one another an alkyl group having 1 to 6 carbon atoms;
- c) R1, R2, R3 are each independently of one another an alkyl group having 1 to 6 carbon atoms;
- and
- d) M+ is an alkali metal ion;
- with the proviso that the salt S is not dimethylimidazolium methylsulfonate.
5 more elements
Dependencies are inferred from the claim text.