Method for producing alkali carbonate
AssigneeKali-Chemie Aktiengesellschaft
InventorsUlrich Hauschild, Reimar Musall, Hans-Jurgen Schroder
Life of this patent
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Abstract
A method for producing alkali carbonate crystals, including adding to an alkali carbonate and alkali hydroxide solution stream a 10 to 75 weight-% alkali hydroxide solution, charging the resulting mixture into a CO.sub.2 -containing gas whose temperature is from 150.degree. to 700.degree.C, collecting mixture remaining as liquid from the gas at the end of a residence time of mixture in gas of 0.1 to 10 seconds, separating alkali carbonate crystals from the collected mixture, and feeding the collected mixture, following the separating, back in the alkali carbonate and alkali hydroxide solution stream for another adding of alkali hydroxide solution.
Claims14
A method for producing alkali carbonate crystals, comprising the steps of:
- a. adding to an alkali carbonate and alkali hydroxide recycle stream that contains at least 8% by weight of alkali hydroxide, a 10 to 75 weight-% alkali hydroxide solution to form a resulting solution which has an alkali hydroxide content of at least 8% by weight;
- b. spraying the resulting solution into a CO.sub.2 -containing gas whose temperature is from 150 to 700.degree.C to react a portion of the alkali hyroxide in said resulting solution with the CO.sub.2 -containing gas and form a liquid mixture containing alkali carbonate formed from reaction of alkali hydroxide with the CO.sub.2 -containing gas, the amount of alkali hydroxide being reacted to form alkali carbonate being equal to the amount of alkali hydroxide added to the recycle stream during the step of adding;
- c. collecting said liquid mixture containing said formed alkali carbonate from the gas at the end of a residence time of said mixture in said gas of from 0.1 to 10 seconds;
- d. separating alkali carbonate crystals from the collected liquid mixture, and;
- e. recycling the collected liquid mixture, following the step of separating, as the said alkali carbonate and alkali hydroxide recycle stream to the step of adding.
Dependencies are inferred from the claim text.