Carbon Monoxide Production Process Optimized by SOEC

Patent metadata

Field	Value
Publication number	US-2021179436-A1
Application number	US-201716076194-A
Country	US
Kind code	A1
Filing date	Feb 20, 2017
Priority date	Feb 26, 2016
Publication date	Jun 17, 2021
Grant date	—

Abstract

The invention concerns a process for producing carbon mon-oxide (CO) from a feed stream comprising carbon dioxide (CO2) and natural gas and/or naphtha the process comprising a syngas generation step, a CO2 removal step and a CO purification step and the process further comprises an SOEC unit which produces CO from a CO2 stream, the process is especially suited for increasing the capacity of existing known CO production plants.

First claim

1 . A process for producing carbon monoxide (CO) from a feed stream comprising carbon dioxide (CO2) and natural gas and/or naphtha, the process comprising
a syngas generation step where a first syngas stream is generated from the feed stream, a CO2 removal step where at least a part of the CO2 is removed from the first syngas stream and the thereby generated CO2 recycle stream is recycled back to the syngas generation step, and a second syngas stream is generated in said CO2 removal step, and a CO purification step where CO is generated from the second syngas stream, wherein the process further comprises an SOEC unit which is fed by a CO2 stream, the SOEC unit generates CO which is fed back into the first syngas stream, thereby raising the CO concentration in the first syngas stream.

2 . A process according to claim 1 , wherein the CO2 stream which is fed to the SOEC unit is a recycle by-pass stream comprising at least a part of said CO2 recycle stream.

3 . A process according to claim 1 , comprising a CO2 import stream which is fed to the syngas generation step.

4 . A process according to claim 1 , comprising a CO2 import stream which is fed to the SOEC unit.

5 . A process according to claim 2 , wherein the SOEC unit comprises a compressor adapted to enable the CO2 recycle by-pass stream to overcome the pressure difference from the CO2 recycle stream, through the SOEC unit and piping and back into the first syngas stream.

6 . A process according to claim 5 , wherein the SOEC unit comprises a pressure reduction valve downstream of the CO2 recycle stream to protect the SOEC unit from exceed pressure.

7 . A process according to claim 1 , wherein the SOEC unit converts 5-99% of the CO2 fed to the SOEC unit to CO.

8 . A process according to claim 1 , wherein the SOEC unit converts 20-60% of the CO2 fed to the SOEC unit to CO.

9 . A process according to claim 1 , wherein the pressure of the first syngas stream is 2-25 Bar(g).

10 . A process according to claim 1 , wherein the pressure of the first syngas stream is 15-25 Bar(g).

11 . A process according to claim 1 , wherein the pressure of the CO2 recycle stream is 0-5 Bar(g).

12 . A process according to claim 1 , wherein the syngas generation step comprises hydrogenation, desulphurization, pre-reforming and reforming.

13 . A process according to claim 1 , wherein the CO purification step comprises cryogenic or membrane CO purification.

Assignees

• Haldor Topsoe As

Inventors

• Wene Henrik C O

Classifications

• C25B15/085

  Removing impurities · CPC title

• C25B1/23

  Carbon monoxide or syngas · CPC title

• Y02E60/36

  Hydrogen production from non-carbon containing sources, e.g. by water electrolysis · CPC title

• C01B2203/147

  Three or more purification steps in series · CPC title

• C01B3/38 Primary

  using catalysts · CPC title