Solvay (societe Anonyme)

Michel Hanse

Francis M Coustry

A method for producing sodium carbonate monohydrate, according to which an aqueous sodium chloride solution () is electrolyzed in a membrane-type cell () from which an aqueous sodium hydroxide solution () is collected, and carbonated by direct contact with carbon dioxide () to form a slurry of crystals of a sodium carbonate monohydrate (), and the slurry or its mother liquor is evaporated () to collect sodium carbonate monohydrate ().

Method for obtaining sodium carbonate monohydrate crystals

Method for producing sodium carbonate, according to which an aqueous sodium chloride solution () is electrolyzed in a membrane-type cell () from which an aqueous sodium hydroxide solution () is collected, and carbonated by direct contact with carbon dioxide () to form a slurry of crystals of a sodium carbonate (), and the slurry or its mother liquor is evaporated () to collect sodium carbonate ().

Method for obtaining sodium carbonate crystals

An aqueous solution of sodium chloride is electrolyzed in a cell () with an ion permselective membrane to produce, on the one hand, chlorine () which is converted in a chlorine production unit () and, on the other, an aqueous sodium hydroxide solution (), which is carbonated using a flue gas () from an electricity and steam cogeneration unit (), and the resulting carbonated solution () is evaporated to produce sodium carbonate crystals ().

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