Patent ID: 6207123
Filing Date: 2001-03-27
Classification: C01D

Abstract:
A process for producing sodium salts, which comprises:a) adding solid sodium carbonate to a first aqueous solution containing sodium carbonate and sodium hydrogencarbonate, to prepare a second aqueous solution;b) precipitating, separating and recovering from the second aqueous solution sodium sesquicarbonate crystals containing at least 50 mol % of the sodium hydrogencarbonate component contained in the second aqueous solution; andc) further recovering sodium carbonate monohydrate from a mother liquor remaining after separating the sodium sesquicarbonate crystals from the second aqueous solution and drying said sodium carbonate monohydrate to obtain anhydrous sodium carbonate;wherein the sodium carbonate monohydrate is recovered in step c) by forming a mixed aqueous solution comprising said mother liquor and an aqueous solution obtained by dissolving solid sodium carbonate obtained by firing trona, and precipitating, separating and recovering the sodium carbonate monohydrate from the mixed aqueous solution.