Method and apparatus for producing alkali bicarbonate and alkali carbonate

JP7880879B2Active Publication Date: 2026-06-26AIROVATION TECHNOLOGIES LTD
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Patent Information

Authority / Receiving Office
JP · JP
Patent Type
Patents
Current Assignee / Owner
AIROVATION TECHNOLOGIES LTD
Filing Date
2021-12-14
Publication Date
2026-06-26

AI Technical Summary

Technical Problem

Existing methods for producing sodium carbonate/bicarbonate from CO2 capture with alkaline solutions face issues of clogging due to the difference in solubility of the salts, leading to inefficient CO2 conversion and premature crystallization of sodium carbonate, which compromises the method's efficiency.

Method used

A method involving the controlled addition of hydrogen peroxide near the sparging device orifice in a microbubble/liquid contact pattern, favoring bicarbonate formation over carbonate, and continuous supply of alkali hydroxide to a gas-liquid contactor to minimize carbonate formation and maximize bicarbonate production.

Benefits of technology

Achieves a high and sustained CO2 conversion rate to bicarbonate, minimizing sparger orifice blockage and maintaining efficiency over extended periods.

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Abstract

The present invention relates to a method for preparing alkali carbonate / bicarbonate salts, comprising the steps of continuously feeding an aqueous alkali hydroxide solution to a gas-liquid contactor, forcing an inlet CO2-containing gas stream through a sparging device immersed in the gas-liquid contactor below the surface level of the aqueous alkali hydroxide solution to generate bubbles and / or microbubbles, adding hydrogen peroxide near the orifice of the sparging device where the bubbles and / or microbubbles are generated, the hydrogen peroxide supply being adjusted to reduce the formation of alkali carbonates and increase the formation of alkali bicarbonates, and continuously discharging an effluent from the gas-liquid contactor from which the alkali carbonates and bicarbonates, predominantly bicarbonate components, are recovered. A gas-liquid contactor and an apparatus are also provided by the present invention.
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Citation Information

Patent Citations

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