JP-2025517373-A5 -

Dates

Publication Date

20260508

Application Date

20230517

Description

Advantages of some embodiments include low energy consumption, low cost or low CO2 emissions, negative CO2 emissions, use in carbon dioxide removal, absence of strong acid products, abundant material availability, or global scalability. The present specification includes the following embodiments. Item 1: A material containing calcium carbonate is reacted with a solution containing aqueous carboxylic acid to form a gas containing carbon dioxide and a solution containing aqueous calcium carboxylic acid. The aforementioned solution containing aqueous calcium carboxylate is reacted with sodium sulfate to form a solution containing aqueous sodium carboxylate and a solid containing calcium sulfate. The solution containing aqueous sodium carboxylate is reacted with sulfur dioxide to form sodium sulfite and aqueous carboxylic acid, The separation of the sodium sulfite from the aqueous carboxylic acid, The process involves reacting sodium sulfite to form a solid containing calcium sulfite, A method comprising decomposing the aforementioned calcium sulfite to form calcium oxide and sulfur dioxide. Item 2: The method according to claim 1, wherein reacting sodium sulfite to form a solid containing calcium sulfite comprises reacting sodium sulfite with calcium hydroxide to form an aqueous solution containing sodium hydroxide and a solid containing calcium sulfite. Item 3: Reacting sodium sulfite to form a solid containing calcium sulfite is, First, calcium carbonate is reacted with carbon dioxide and water to form a solution containing aqueous calcium bicarbonate, and then, The method according to claim 1, comprising reacting the solution containing aqueous calcium bicarbonate with sodium sulfite to form a solution containing aqueous sodium bicarbonate and a solid containing calcium sulfite. Item 4: The decomposition of the aforementioned sodium bicarbonate to form sodium carbonate and carbon dioxide, The calcium oxide is reacted with water to form calcium hydroxide, The method according to claim 3, further comprising reacting the sodium carbonate with the calcium hydroxide to form an aqueous solution containing sodium hydroxide and a solid containing calcium carbonate. Item 5: The method according to claim 3, further comprising decomposing the sodium bicarbonate to form sodium carbonate and carbon dioxide. Item 6: The method according to claim 5, further comprising reacting the sodium carbonate with calcium hydroxide to form an aqueous solution containing sodium hydroxide and a solid containing calcium carbonate. Item 7: The method according to any one of claims 1 to 3, further comprising reacting calcium oxide with water to form calcium hydroxide. Item 8: The method according to any one of claims 1 to 3, wherein the aqueous carboxylic acid is selected from formic acid, acetic acid, propanoic acid, or any mixture thereof. Item 9: The method according to any one of claims 1 to 3, wherein the reaction of the solution containing aqueous sodium carboxylate with sulfur dioxide is carried out in an absorption tower comprising a first step and a second step. Item 10: The method according to any one of claims 1 to 3, wherein at least a portion of the calcium oxide is reacted with carbon dioxide to form calcium carbonate. Item 11: A material containing calcium carbonate is reacted with a solution containing aqueous carboxylic acid to form a gas containing carbon dioxide and a solution containing aqueous calcium carboxylic acid. The aforementioned solution containing aqueous calcium carboxylate is reacted with sodium sulfite to form a solution containing aqueous sodium carboxylate and a solid containing calcium sulfite. Decomposing the aforementioned calcium sulfite to form calcium oxide and sulfur dioxide, The aforementioned solution containing aqueous sodium carboxylate is reacted with sulfur dioxide to form sodium sulfite and carboxylic acid. A method comprising separating at least a portion of the sodium sulfite from the aqueous carboxylic acid. Item 12: The method according to claim 11, further comprising reacting calcium oxide with water to form calcium hydroxide. Item 13: The method according to claim 11 or 12, further comprising recovering at least a portion of the carbon dioxide. Item 14: The method according to any one of claims 11 to 13, wherein the carboxylic acid is selected from formic acid, acetic acid, or propanoic acid, and the carboxylate salt is selected from formate, acetate, or propanoate. Item 15: The method according to any one of claims 11 to 13, wherein the reaction of the solution containing aqueous sodium carboxylate with sulfur dioxide is carried out in an absorption tower comprising a first step and a second step.