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EP-4739423-A1 - METHOD FOR SOLVENT REGENERATION USED IN CARBON CAPTURE AND/OR SULPHUR CAPTURE, MEMBRANE DEVICE, MEMBRANE STACK, AND SYSTEM TO PERFORM SAID METHOD

EP4739423A1EP 4739423 A1EP4739423 A1EP 4739423A1EP-4739423-A1

Abstract

The invention relates to a method for solvent regeneration used in carbon capture and/or sulphur capture, a membrane device, a membrane stack, and a system to perform said method. The method comprises the steps of: - providing a membrane device, comprising: - two or more compartments, wherein one of the two or more compartments comprises a cathode and wherein another of the two or more compartments comprises an anode; and - at least one membrane between the two or more compartments; - providing an aqueous solvent stream to the compartment comprising the cathode, wherein the aqueous solvent comprises a dissolved carbon-based gas and/or a dissolved sulphur-based gas; - feeding hydrogen gas to the compartment comprising the anode; - applying an electrical potential difference between the anode and the cathode; - degassing the aqueous solvent stream; and - releasing the carbon-based gas and/or the sulphur-based gas from the membrane device.

Inventors

  • LIN, MU
  • KUNTKE, Philipp
  • HAMELERS, HUBERTUS VICTOR MARIE
  • FERWERDA, Johannes Cornelis

Assignees

  • W & F TECHNOLOGIES B.V.

Dates

Publication Date
20260513
Application Date
20240705

Claims (20)

  1. 1. Method for solvent regeneration used in carbon capture and/or sulphur capture, comprising the steps of: providing a membrane device, comprising: two or more compartments, wherein one of the two or more compartments comprises a cathode and wherein another of the two or more compartments comprises an anode; and at least one membrane between the two or more compartments; providing an aqueous solvent stream to the compartment comprising the cathode, wherein the aqueous solvent stream comprises a dissolved carbon-based gas and/or a dissolved sulphur-based gas; feeding hydrogen gas to the compartment comprising the anode; applying an electrical potential difference between the anode and the cathode; degassing the aqueous solvent stream; and releasing the carbon-based gas and/or the sulphur-based gas from the membrane device.
  2. 2. Method according to claim 1 , further comprising the step of providing a membrane electrode assembly comprising the compartment comprising the anode and one of the at least one membrane.
  3. 3. Method according to claim 2, wherein the membrane electrode assembly comprises a catalyst, preferably wherein the catalyst comprises nickel and/or platinum.
  4. 4. Method according to claim 2 or 3, wherein the membrane electrode assembly is an anion exchange membrane electrode assembly.
  5. 5. Method according to claim 2, 3, or 4, wherein the membrane electrode assembly is a proton exchange membrane electrode assembly.
  6. 6. Method according to any one of the preceding claims, wherein the step of degassing comprises the step of regenerating the aqueous solvent stream.
  7. 7. Method according to any one of the preceding claims, further comprising the step of providing the membrane device with at least two membranes between the compartment comprising the cathode and the compartment comprising the anode, wherein a second membrane partly delineates the compartment comprising the cathode, and providing at least three or more compartments.
  8. 8. Method according to any one of the preceding claims, further comprising the step of conducting a pH-swing in the another of the two or more compartments comprising an anode, and/or when dependent on claim 7 conducting a pH-swing in the compartment delineated by the at least two membranes, wherein the pH-swing is between pH 0 and pH 14, preferably pH 2 and pH 10, more preferably pH 3 and pH 9, even more preferably pH 4 and pH 8.
  9. 9. Method according to claim 7 or 8, wherein the second membrane is an anion exchange membrane.
  10. 10. Method according to claim 7, 8, or 9, further comprising the step of providing the compartment delineated by the at least two membranes with conductive media.
  11. 11. Method according to claim 10, wherein the conductive media is a conductive resin and/or an ionic liquid, preferably the conductive resin is an anion exchange resin.
  12. 12. Method according to any one of the preceding claims, wherein the aqueous solvent stream comprising a dissolved carbon-based gas and/or a dissolved sulphur-based gas comprises 0.001 mol L 1 to 10 mol L 1 carbon-based gas and/or sulphur-based gas, preferably 0.1 mol L 1 to 5 mol L ', more preferably 0.5 mol L 1 to 4 mol L ', even more preferably 0.5 mol L 1 to 2 mol L ', most preferably 1 mol L 1 to 1.5 mol L '.
  13. 13. Method according to any one of the preceding claims, wherein the carbon-based gas is substantially carbon dioxide and/or the sulphur-based gas is substantially hydrogen sulphide.
  14. 14. Method according to any one of the preceding claims, wherein the aqueous solvent stream comprises an amine.
  15. 15. Method according to claim 14, wherein the amine comprises one or more selected from the group of monoethanolamine, diglycolamine, diethanolamine, diisopropanolamine, triethanolamine, methyldiethanolamine, methyl diethanolamine, piperazine, aminomethyl propanol, aminoethylethanolamine, 2-(diethylamino)-ethanol, /V,/V-dimcthylcthanolaminc, triethylene diamine, diisopropanolamine.
  16. 16. Method according to claim 14 or 15, wherein the amine is present in a concentration in the range of 0.25 mol L 1 to 4 mol L ', preferably in the range of 0.25 mol L 1 to 3 mol L ', more preferably in the range of 0.25 mol L 1 to 2 mol L ', even more preferably in the range of 0.5 mol L 1 to 2 mol L '.
  17. 17. Method according to any one of the preceding claims, wherein the aqueous solvent stream comprises one or more selected from the group of sodium hydroxide, potassium hydroxide, sodium carbonate, sodium bicarbonate, potassium carbonate, potassium bicarbonate, lithium hydroxide, lithium carbonate, lithium bicarbonate, ammonium.
  18. 18. Method according to any one of the preceding claims, wherein the aqueous solvent stream comprises one or more selected from the group of calcium carbonate, magnesium carbonate, tetramethylammonium, tetraethylammonium, tetrapropylammonium, tetrabutylammonium, forming an aqueous suspension.
  19. 19. Method according to any one of the preceding claims, further comprising the step of providing at least one bipolar membrane to the membrane device.
  20. 20. Method according to any one of the preceding claims, further comprising the step of capturing a carbon-based gas and/or a sulphur-based gas in the aqueous solvent stream.

Description

METHOD FOR SOLVENT REGENERATION USED IN CARBON CAPTURE AND/OR SULPHUR CAPTURE, MEMBRANE DEVICE, MEMBRANE STACK, AND SYSTEM TO PERFORM SAID METHOD The present invention relates to a method for solvent regeneration used in carbon capture and/or sulphur capture, a membrane device, a membrane stack, and a system to perform said method. Conventional methods and/or systems for solvent regeneration used in carbon capture and/or sulphur capture use alkaline solutions as absorbent. The regeneration of said alkaline absorbent includes temperature swings. Conventionally, the alkaline, for example NaOH, is regenerated by exchanging sodium and calcium ions by dosing calcium hydroxide. Subsequently, the resulting calcite (CaCOs) precipitate is thermally treated at 700 °C to produce CO2 and calcium oxide. Finally, calcium hydroxide can be regenerated by rehydration of calcium oxide. Therefore, the subsequent regeneration of the alkaline solution is highly energy-demanding. These problems prevent an efficient and effective solvent regeneration used in carbon capture and/or sulphur capture, as the conventional methods and systems require a large amount of energy. This problem is even bigger for large scale regeneration of solvents used in carbon capture and/or sulphur capture. Thus, conventional methods and systems are not suitable for high throughput. An objective of the present invention is to provide a method for solvent regeneration used in carbon capture and/or sulphur capture that obviates or at least reduces one or more of the aforementioned problems and/or is more effective as compared to conventional methods and systems. This objective is achieved with the method for solvent regeneration used in carbon capture and/or sulphur capture, comprising the steps of: providing a membrane device, comprising: two or more compartments, wherein one of the two or more compartments comprises a cathode and wherein another of the two or more compartments comprises an anode; and at least one membrane between the two or more compartments; providing an aqueous solvent stream to the compartment comprising the cathode, wherein the aqueous solvent stream comprises a dissolved carbon-based gas and/or a dissolved sulphur-based gas; feeding hydrogen gas to the compartment comprising the anode; applying an electrical potential difference between the anode and the cathode; degassing the aqueous solvent stream; and releasing the carbon-based gas and/or the sulphur-based gas from the membrane device. It is noted that carbon capture relates to capturing carbon, for example carbon in a gaseous waste stream. Furthermore, the carbon capture relates to capturing carbon moieties. Said carbon moieties may also be referred to as molecules comprising carbon, wherein said molecules are preferably in a gas state at ambient conditions. It is also noted that sulphur capture relates to capturing sulphur, for example sulphur in a gaseous waste stream. Furthermore, the sulphur capture relates to capturing sulphur moieties. Said sulphur moieties may also be referred to as molecules comprising sulphur, wherein said molecules are preferably in a gas state at ambient conditions. It is also noted that releasing in this application relates to removing the carbon-based gas and/or the sulphur based-gas from the membrane device. In other words, the carbon-based gas and/or the sulphur based-gas may be captured, for example in the aqueous solvent stream, followed by setting said gas free. It is also noted that, throughout this application unless otherwise stated, an aqueous solvent stream refers to a solvent stream comprising water. It is also noted that throughout this application an electrical potential difference may include providing an electric current. The method according to the invention may start with the step of providing a membrane device. Said membrane device comprises two or more compartments, wherein one of the two or more compartments comprises a cathode and wherein another of the two or more compartments comprises an anode. Furthermore, at least one membrane is assembled between the two or more compartments. It is noted that, throughout this application, the compartment comprising the cathode may also be referred to as cathode compartment comprising a cathode. Furthermore, the compartment comprising the anode may also be referred to as anode compartment comprising an anode. The two or more compartments extend at least partially between the anode and the cathode, wherein the two or more compartments are separated by the at least one membrane. Thus, the at least one membrane is configured to define two or more compartments. The step of providing may than be followed by the step of providing an aqueous solvent stream to the compartment comprising the cathode, wherein the aqueous solvent stream comprises a dissolved carbon-based gas and/or a dissolved sulphur-based gas, and followed by the steps of feeding hydrogen gas to the compartment and applying an el