Soda ash (Na2CO3) may be produced through an energy efficient process using the reactants aqueous sodium hydroxide (NaOH (aq)) and flue gas containing carbon dioxide (CO2) from power plant through a two-step process including electrolyzing aqueous sodium chloride solution (NaCl (aq)) and the supplying electrical power for producing sodium hydroxide and hydrogen chloride in an ion exchange membrane electrolyzer while removing produced gaseous hydrogen and chlorine, combined with a reaction carried out in a packed column between said produced sodium hydroxide and said supplied flue gas containing gaseous carbon dioxide for obtaining said soda ash.
C25B 1/34 - Production simultanée d'hydroxydes des métaux alcalins et de chlore, de ses oxyacides ou de ses sels, p. ex. électrolyse chlore-alcali
C25B 1/46 - Production simultanée d'hydroxydes des métaux alcalins et de chlore, de ses oxyacides ou de ses sels, p. ex. électrolyse chlore-alcali dans des cellules à diaphragmes
B01D 53/14 - Séparation de gaz ou de vapeursRécupération de vapeurs de solvants volatils dans les gazÉpuration chimique ou biologique des gaz résiduaires, p. ex. gaz d'échappement des moteurs à combustion, fumées, vapeurs, gaz de combustion ou aérosols par absorption
B01D 53/73 - Post-traitement des composants éliminés
2.
CO2 SCRUBBER/SEPARATOR USING A CYCLIC CARBONATOR FOR CONTROLLED CARBONATE/BICARBONATE PRODUCTION
The present invention comprises a cyclic pressurized carbonator reactor for scrubbing CO2 from industrial gas streams to produce high purity carbonates/bi-carbonates, and pure CO2 streams, characterized in that the said carbonator reactor comprise a steel tank with stirrer and cooled double walls, a heat exchanger that cools the carbonator, a coolant volume, a cooled surface area, an impeller that disperses the gas, where said impeller is mounted on a hollow shaft drawing gas from the gas volume at the top of the reactor, three baffles that extend through almost all of the working volume of the said tank, motors with variable speed drives, and the shaft seal is double mechanical type with cooling.
B01D 53/14 - Séparation de gaz ou de vapeursRécupération de vapeurs de solvants volatils dans les gazÉpuration chimique ou biologique des gaz résiduaires, p. ex. gaz d'échappement des moteurs à combustion, fumées, vapeurs, gaz de combustion ou aérosols par absorption
B01D 53/18 - Unités d'absorptionDistributeurs de liquides
C01B 31/24 - Procédés de préparation des carbonates ou des bicarbonates en général
There is disclosed a method for processing an input gas stream, characterised by the following steps of: a) reacting the carbon dioxide of the input gas stream with an alkaline solution based on ammonia, for the formation of ammonium carbonates; b) reacting said ammonium carbonates from step a) with a saline solution for forming chemical products including alkaline metal carbonate and ammonium chloride; and c) processing said ammonium chloride from step b) by decomposition to form ammonia and metal chloride and/or hydrochloride acid; and d) step c) is implemented by using calcium oxide (CaO) to generate calsium chloride as said metal chloride, and/or by using magnesium oxide (MgO) to generate magnesium chloride as said metal chloride. Preferably the method is used in a combined process for removing carbon dioxide from combustion gas and desalination of water.
There is disclosed at method for conducting a reaction, which is characterised in that carbon dioxide is combined with an alkaline solution based on ammonia, for the formation of ammonium bicarbonates, said bicarbonates being further reacted with a saline comprising solution, forming products of alkaline metal bicarbonate and ammonium chloride, and said ammonium chloride product is processed further in a decomposition to form ammonia and hydro chloric acid, and said ammonia chloride is returned to the first step forming said alkaline solution with water, while the alkaline metal bicarbonate is optionally further decomposed into carbon dioxide which is returned to the first step of the method. According to another aspect, the invention is used for handling of brine water originating from a desalination plant, for removing carbon dioxide from combustion gas, such as related to power plants or other industrial activities. Preferably the method is used in a combined process for removing carbon dioxide from combustion gas and desalination of water.
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