Method for the control of pressure in a loop for the preparation of ammonia or methanol

Patent metadata

Field	Value
Publication number	US-12545592-B2
Application number	US-202217986123-A
Country	US
Kind code	B2
Filing date	Nov 14, 2022
Priority date	May 18, 2020
Publication date	Feb 10, 2026
Grant date	Feb 10, 2026

Abstract

A method for the control of pressure in a loop for the preparation of ammonia or methanol by using an anti-surge control valve of a compressor and/or a compressor flow regulation valve for the recirculation of loop recirculation gas at variating flow supply of fresh synthesis gas.

First claim

What is claimed is:

1 . A method for the control of pressure in a loop for the preparation of ammonia or methanol comprising the steps of:
(a) providing a fresh ammonia or methanol synthesis gas; (b) providing a loop recirculation gas; (c) providing a loop recirculation compressor with an anti-surge valve and/or a compressor flow regulation valve; (d) providing an ammonia or methanol synthesis loop; (e) adding the fresh ammonia or methanol synthesis gas into the loop recirculation gas; (f) pressurizing the loop recirculation gas from step (e) in the loop recirculation compressor; and (g) monitoring pressure in the ammonia or methanol synthesis loop, wherein flow of the loop recirculation gas through the anti-surge valve and/or the recirculation compressor flow regulation valve is controlled to obtain a substantially constant pressure in the ammonia or methanol synthesis loop.

2 . The method of claim 1 , wherein the compressor flow regulation valve is arranged in parallel with the anti-surge valve.

3 . The method of claim 1 , wherein flow of the fresh ammonia or methanol synthesis gas is controlled by an anti-surge valve of a compressor for the fresh synthesis gas.

4 . The method of claim 1 , comprising the further step of controlling temperature in a high-pressure loop separator arranged in the loop for the preparation of ammonia or methanol.

5 . The method of claim 1 , wherein hydrogen in the fresh ammonia or methanol synthesis gas is provided by means of electrolysis of water.

6 . The method of claim 5 , wherein the electrolysis of water is performed in a solid oxide electrolysis cell.

7 . The method of claim 1 , wherein the fresh methanol synthesis gas is provided by co-electrolysis of water and carbon dioxide.

8 . The method of claim 1 , wherein nitrogen in the fresh ammonia synthesis gas is provided by means of air separation.

9 . The method of claim 1 , wherein the fresh ammonia synthesis gas is prepared of water and air in a solid oxide electrolysis cell.

10 . The method of claim 1 , wherein flow of the loop recirculation gas is additionally controlled by a loop pressure controller downstream or upstream the recirculation compressor.

11 . The method of claim 1 , wherein the module of the fresh ammonia synthesis gas is controlled by a ratio controller of hydrogen and nitrogen flow in ammonia synthesis gas by controlling the nitrogen flow rate relative to the hydrogen flow rate.

12 . The method of claim 11 , wherein the ratio controller is compensated by a real-time analyzer.

13 . A method for the control of pressure in a loop for the preparation of methanol comprising the steps of:
(a) providing a fresh methanol synthesis gas; (b) providing a loop recirculation gas; (c) providing a loop recirculation compressor with an anti-surge valve and/or a compressor flow regulation valve; (d) providing a methanol synthesis loop; (e) pressurizing the loop recirculation gas in the loop recirculation compressor; (f) adding the fresh methanol synthesis gas into the loop recirculation gas; and (g) monitoring pressure in the methanol synthesis loop, wherein flow of the loop recirculation gas through the anti-surge valve and/or the recirculation compressor flow regulation valve is controlled to obtain a substantially constant pressure in the methanol synthesis loop.

Assignees

• Topsoe As

Inventors

• Speth Christian Henrik
• Hultqvist Michael
• Han Pat A

Classifications

• C01C1/0417

  characterised by the synthesis reactor, e.g. arrangement of catalyst beds and heat exchangers in the reactor · CPC title

• C07C29/1512 Primary

  characterised by reaction conditions · CPC title

• C01C1/0488

  Processes integrated with preparations of other compounds, e.g. methanol, urea or with processes for power generation · CPC title

• C01C1/0482 Primary

  Process control; Start-up or cooling-down procedures · CPC title

• Y02E60/36

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