Storage medium and method for separating, storing and transporting chlorine from chlorine-containing gases

Patent metadata

Field	Value
Publication number	US-11905177-B2
Application number	US-201917054149-A
Country	US
Kind code	B2
Filing date	May 3, 2019
Priority date	May 7, 2018
Publication date	Feb 20, 2024
Grant date	Feb 20, 2024

Abstract

The invention relates to a storage medium and to a method for using a storage medium based on ionic compounds, which can reversibly absorb and store chlorine and chlorine from process gases, and which can release the same again by changing the ambient conditions, wherein the storage medium can be reused for this task after discharge.

First claim

The invention claimed is:

1. A process for the reversible storage of chlorine from chlorine-containing gas in a storage medium, the process comprising:
contacting chlorine-containing gas with a liquid storage medium in a first step to form a loaded storage medium, the liquid storage medium comprising an ionic compound (I) having the formula
N—R1 m R2 n R3 o + Cl r −   (I);

wherein the loaded storage medium comprises chlorine from the chlorine- containing gas in an ionic compound (III) having the formula
N—R1 m R2 n R3 o + Cl (r+2) −   (III);

wherein each of R 1 , R 2 and R 3 independently comprise an alkyl radical selected from the following group: methyl, ethyl, n-propyl, isopropyl, n-butyl, isobutyl, and 2-methylpropyl;
wherein R1, R2, and R3 collectively comprise more than one type of alkyl radical:
wherein m is an integer in a range of 0 to 3, n is an integer in a range of 0 to 3, o is an integer in a range of 0 to 3, and wherein a sum consisting of m, n, and o is 4; and
wherein r is an odd number in a range of 1 to 7, and wherein s is an odd number in a range of 1 to 7;

removing chlorine from the loaded storage medium by increasing a temperature of the storage medium and/or lowering a partial pressure above the storage medium, thereby discharging chlorine.

2. The process as claimed in claim 1 , wherein removing the chlorine takes place at a temperature within a range of 40° C. to 200° C., and at a pressure within a range of 900 hPa to 1100 hPa.

3. The process as claimed in claim 1 , wherein removing the chlorine is initiated through reducing the partial pressure by at least 100 hPa.

4. The process as claimed in claim 1 , wherein at least 0.10 g of chlorine per g of ionic compound (III), is released from the storage medium during this process.

5. The process as claimed in claim 1 , wherein m is an integer in a range of 1 to 3, n is an integer in a range of 1 to 3, and o is equal to 0.

6. The process as claimed in claim 1 , wherein the ionic compound (I) comprises a compound selected from the group consisting of NEtMe 3 Cl r , NEt 2 Me 2 Cl r , NEt 3 MeCl r , NBuEt 2 MeCl r , NMePr 3 Cl r , and NBu 2 Me 2 Cl r .

7. The process as claimed in claim 1 , wherein the ionic compound (I) comprises a compound selected from the group consisting of NEtMe 3 Cl r , NEt 2 Me 2 Cl r , and NEt 3 MeCl r .

8. The process as claimed in claim 1 , wherein the loaded storage medium contains at least 0.65 g of chlorine per g of ionic compound (III).

9. The process as claimed in claim 1 , wherein the loaded storage medium is liquid at a temperature of 25° C. and a pressure of 1000±100 hPa.

10. The process as claimed in claim 1 , wherein the process comprises conditioning an initial loading of a storage medium with chlorine gas, wherein the storage medium comprises the ionic compound (I), wherein the initial loading of the storage medium becomes loaded with chlorine gas only to such an extent that the storage medium liquefies.

11. The process as claimed in claim 10 , wherein conditioning with chlorine takes place to such an extent that a storage medium of ionic compound (III) is obtained and the storage medium of ionic compound (III) is not fully loaded with chlorine.

12. The process as claimed in claim 10 , wherein in a second step after conditioning, chlorine is removed from chlorine-containing gas through contacting with the liquid storage medium from the first step, as a result of which the storage medium becomes loaded and the compounds (I) reacts to form ionic compounds (III).

13. The process as claimed in claim 1 , wherein the loading of the liquid storage medium takes place at a temperature in a range of 0° C. to 40° C. and a pressure within a range of 900 hPa to 7000 hPa.

Assignees

• Covestro Intellectual Property Gmbh & Co Kg

Inventors

• Paven Maxime
• Schiesser Yuliya
• Weber Rainer
• Langstein Gerhard
• Trieu Vinh
• Hasenstab-Riedel Sebastian
• Schwarze Nico
• Steinhauer Simon

Classifications

• C01B7/0743 Primary

  of gaseous or dissolved chlorine · CPC title

• B01D53/1493

  Selection of liquid materials for use as absorbents · CPC title

• B01D2252/2053

  Other nitrogen compounds · CPC title

• B01D2252/30

  Ionic liquids and zwitter-ions · CPC title

• B01D2257/2025

  Chlorine · CPC title