Catalyst for purification of CO2 from chlorinated hydrocarbons

Patent metadata

Field	Value
Publication number	US-9850136-B2
Application number	US-201415028992-A
Country	US
Kind code	B2
Filing date	Oct 15, 2014
Priority date	Oct 16, 2013
Publication date	Dec 26, 2017
Grant date	Dec 26, 2017

Abstract

A process for the purification of CO 2 from chlorinated hydrocarbons and non-chlorinated hydrocarbons, comprising: contacting a CO 2 stream with a chromium oxide catalyst, wherein the stream comprises the CO 2 , and impurities, wherein the impurities comprise the non-chlorinated hydrocarbons and the chlorinated hydrocarbons; forming a purified CO 2 stream by interacting the impurities with the chromium oxide catalyst to form additional CO 2 and chromium chloride; and regenerating the chromium oxide catalyst by contacting the chromium chloride with an oxygen containing gas stream.

First claim

We claim:

1. A process for the purification of CO 2 from chlorinated hydrocarbons and non-chlorinated hydrocarbons, comprising:
contacting a CO 2 stream with a chromium oxide catalyst, wherein the stream comprises the CO 2 , and impurities, wherein the impurities comprise the non-chlorinated hydrocarbons and the chlorinated hydrocarbons;
forming a purified CO 2 stream by interacting the impurities with the chromium oxide catalyst to form additional CO 2 and chromium chloride; and
regenerating the chromium oxide catalyst by contacting the chromium chloride with an oxygen containing gas stream.

2. A process for the purification of CO 2 from chlorinated hydrocarbons and non-chlorinated hydrocarbons, comprising:
contacting a CO 2 stream with a chromium oxide catalyst, wherein the CO 2 stream comprises the CO 2 and impurities, wherein the impurities comprise the non-chlorinated hydrocarbons and the chlorinated hydrocarbons; and
forming a purified CO 2 stream by oxidizing the impurities in the CO 2 stream with catalyst oxygen to form additional CO 2 and converting the chlorine to chromium chloride; and
regenerating the chromium oxide catalyst by contacting the chromium chloride with an oxygen containing gas stream;
wherein no oxygen is added to the CO 2 stream before or during the contacting and the oxidizing.

3. A process for the purification of CO 2 from chlorinated hydrocarbons and non-chlorinated hydrocarbons, comprising:
contacting a CO 2 stream with a chromium oxide catalyst, wherein the CO 2 stream comprises the CO 2 and impurities, wherein the impurities comprise the non-chlorinated hydrocarbons and the chlorinated hydrocarbons;
forming a purified CO 2 stream by oxidizing the impurities with catalyst oxygen to form additional CO 2 and converting the chlorine to chromium chloride; and
regenerating the chromium oxide catalyst by contacting the chromium chloride with an oxygen containing gas stream;
wherein the CO 2 stream comprises less than or equal to 0.3 ppmv of oxygen based on the total volume of the CO 2 stream.

4. The process of claim 1 , further comprising:
prior to the contacting, reacting ethylene and oxygen with a chlorine containing catalyst to produce ethylene glycol, CO 2 , and the chlorinated hydrocarbons; and
separating the ethylene glycol to form the CO 2 stream;
wherein the forming comprising forming the purified CO 2 stream by oxidizing the impurities with catalyst oxygen to form the additional CO 2 and converting the chlorine to chromium chloride.

5. The process of claim 4 , wherein the CO 2 stream comprises less than or equal to 0.3 ppmv of oxygen.

6. The process of claim 4 , wherein no oxygen is added to the CO 2 stream before or during the contacting and the forming.

7. The process of claim 1 , wherein the regenerating produces molecular chlorine and wherein the process further comprises absorbing the molecular chlorine with water.

8. The process of claim 1 , wherein the regenerating is performed for a time of less than or equal to 60 hours.

9. The process of claim 1 , wherein the contacting is performed at a temperature of 400 to 500° C.

10. The process of claim 1 , wherein the contact time of the CO 2 stream with the catalyst is 2.4 to 3 sec.

11. The process of claim 1 , wherein the purified CO 2 stream comprises less than or equal to 0.01 ppmv of chlorinated hydrocarbons.

12. The process of claim 1 , wherein the contacting is performed for a time of greater than or equal to 170 hours.

13. The process of claim 1 , wherein the contacting is performed under conditions that oxygen is not added to the CO 2 stream and the CO 2 stream was not an oxygen diluted CO 2 stream.

14. The process of claim 1 , wherein the catalyst further comprises a second metal oxide comprising a metal, wherein the metal comprises Mn, Sn, W, V, Mo, La, Ce, Pb, Mg, or a combination comprising one or more of the foregoing.

15. The process of claim 1 , wherein the purified CO 2 stream is converted into methanol.

16. The process of claim 1 , wherein the purified CO 2 stream is combined with syngas from a methane stream reforming source and converted into methanol.

17. The process of claim 1 , wherein the chromium oxide catalyst comprises Cr/γ-Al 2 O 3 and/or Cr/α-Al 2 O 3 .

18. The process of claim 17 , wherein the chromium oxide catalyst comprises Cr/α-Al 2 O 3 from an isobutylation reaction.

19. The process of claim 1 , wherein the CO 2 stream comprises greater than or equal to 90 vol % CO 2 based on the total volume of the CO 2 stream.

20. The process of claim 1 , wherein the CO 2 stream comprises less than or equal to 200 ppmv of impurities based on the total volume of the CO 2 stream.

Assignees

• Saudi Basic Ind Corp

Inventors

• Mammadov Aghaddin Kh
• Rea Clark David

Classifications

• B01D2257/702

  Hydrocarbons · CPC title

• B01J38/12

  Treating with free oxygen-containing gas · CPC title

• B01D53/8668

  Removing organic compounds not provided for in B01D53/8603 - B01D53/8665 · CPC title

• B01D2258/02

  Other waste gases · CPC title

• C01B31/20 Primary

  Chemistry & Metallurgy · mapped topic