Method for separating water from a gaseous working medium, and water separator for a working medium

Patent metadata

Field	Value
Publication number	US-2018290102-A1
Application number	US-201515531555-A
Country	US
Kind code	A1
Filing date	Dec 1, 2015
Priority date	Dec 4, 2014
Publication date	Oct 11, 2018
Grant date	—

Abstract

The invention relates to a method for separating water from a gaseous working medium ( 2 ), at least the following steps being carried out: providing an ionic hygroscopic liquid ( 4 ) in a reaction chamber ( 3 ); supplying the water-containing working medium ( 2 ) and conducting the working medium ( 2 ) through the ionic liquid ( 4 ), wherein water bonds with the ionic liquid ( 4 ) and is thereby separated from the working medium; and discharging the dried working medium ( 7 ). The invention further relates to a corresponding water separator ( 1 ) and to a water separator system ( 15 ).

First claim

1 . A method of separating water out of a gaseous working medium, characterized in that at least the following steps are conducted:
a) holding a hygroscopic ionic liquid in a reaction chamber; b) feeding the water-containing working medium into the reaction chamber and passing the working medium through the ionic liquid, wherein water is bound by the ionic liquid and hence separated out of the working medium; c) removing the dried working medium.

2 . The method as claimed in claim 1 , characterized in that the method is executed as a continuous method, wherein a working medium inlet for introducing the water-containing working medium into the reaction chamber and a clean medium outlet for discharging the dried working medium from the reaction chamber are provided in the reaction chamber, wherein the working medium to be dried is conducted upward through the ionic liquid counter to the field of gravity in the reaction chamber.

3 . The method as claimed in claim 1 , characterized in that the ionic liquid is reprocessed by heating the reaction chamber and removing the water separated out in vaporous form via a water outlet, wherein the ionic liquid is heated until the water content has been reduced to a predefined value, wherein the ionic liquid is heated for this purpose over an empirically determined heating time or the water content is determined by means of at least one of the following measures:
determining the fill level of the ionic liquid; determining the mass of the ionic liquid; determining the mass of water separated out; and determining the electrical conductivity value of the ionic liquid.

4 . The method as claimed in claim 1 , characterized in that the ionic liquid is exchanged for reprocessing, wherein water-laden ionic liquid is especially drawn off from the reaction chamber and reprocessed ionic liquid is fed into the reaction chamber, and wherein the ionic liquid is exchanged continuously, wherein particles collected in the separation method are more filtered out at the same time.

5 . The method as claimed in claim 3 , characterized in that the distilled water obtained in the reprocessing is collected, wherein the ionic liquid is freed of particles beforehand by means of at least one filter.

6 . The method as claimed in claim 1 , characterized in that any dead space in the reaction chamber is reduced down to a desired level by means of raising the liquid level of the ionic liquid, down to a predefined safety margin from the clean medium outlet and/or the water outlet.

7 . The method as claimed in claim 1 , characterized in that the dried working medium to be removed is conducted through at least one coalescence filter in order to execute fine separation of water fractions before it is removed as clean medium and provided to a downstream process.

8 . The method as claimed in claim 1 , characterized in that, in step b), the separation of water out of the working medium in the reaction chamber is conducted at pressures in the reaction chamber in the range from 1 bar to 551 bar and/or at temperatures in the reaction chamber in the range from +60° C. to +250° C.

9 . A water separator for a gaseous working medium to be dried, characterized in that the water separator comprises at least the following components:
a liquid-tight reaction chamber to accommodate a hygroscopic ionic liquid, wherein the reaction chamber is filled with the hygroscopic ionic liquid, and wherein the reaction chamber is designed to bear an elevated pressure relative to the ambient atmosphere of the reaction chamber; a closable working medium inlet for introducing the gaseous and water-containing working medium to be dried into the reaction chamber, wherein the working medium inlet is arranged beneath the reaction chamber; and a closable clean medium outlet for removing the dried working medium from the reaction chamber, wherein the clean medium outlet is arranged above the reaction chamber.

10 . The water separator as claimed in claim 9 , characterized in that at least one preferably closable water outlet is additionally arranged above the reaction chamber, wherein evaporating water can be removed from the reaction chamber via the water outlet, in the course of reprocessing of the ionic liquid in the reaction chamber, and wherein the reaction chamber has at least one heating element for boiling off the water.

11 . The water separator as claimed in claim 9 , characterized in that at least one exchange outlet is additionally provided, beneath the reaction chamber, for supply of ionic liquid into the reaction chamber and for removal of ionic liquid from the reaction chamber.

12 . The water separator as claimed in claim 9 , characterized in that at least one inlet and at least one separate outlet are provided in the reaction chamber for the ionic liquid, such that the ionic liquid in the reaction chamber is continuously exchangeable.

13 . The water separator as claimed in claim 9 , characterized in that the clean medium outlet is put into flow connection with a coalescence filter set up for fine separation of water fractions from the dried working medium.

14 . A water separator system for drying a working medium, characterized in that the water separator system has at least one water separator comprising a liquid-tight reaction chamber to accommodate a hygroscopic ionic liquid, wherein the reaction chamber is filled with the hygroscopic ionic liquid, and wherein the reaction chamber is designed to bear an elevated pressure relative to the ambient atmosphere of the reaction chamber; a closable working medium inlet for introducing the gaseous and water-containing working medium to be dried into the reaction chamber, wherein the working medium inlet is arranged beneath the reaction chamber; and a closable clean medium outlet for removing the dried working medium from the reaction chamber, wherein the clean medium outlet is arranged above the reaction chamber and at least one reprocessing apparatus for reprocessing the ionic liquid for the reaction chamber, wherein the reprocessing apparatus has at least one particulate filter for filtering out particulate impurities, and has at least one heating element for evaporating water that has separated out and at least one water outlet for removing evaporated water.

Assignees

• Linde Ag

Inventors

• Adler Robert
• Klein Ekkehardt
• Rasch Markus
• Nagl Christoph
• Pollak Andreas

Classifications

• C01B2203/0495

  the impurity being water · CPC title

• C10L2290/541

  Absorption of impurities during preparation or upgrading of a fuel · CPC title

• C01B3/50

  Separation of hydrogen or hydrogen-containing gases from gaseous mixtures, e.g. purification · CPC title

• B01D46/0036

  by adsorption or absorption · CPC title

• C10L3/106

  of water · CPC title