Patent ID: 9051627
Filing Date: 2015-06-09
Classification: C01D,C22B

Abstract:
1. A process for producing sodium bicarbonate from a sodium carbonate bearing stream (A), a part of which is generated by a sodium carbonate crystallizer, said sodium carbonate bearing stream (A) comprising sodium carbonate and at least 2% sodium chloride and/or sodium sulfate by weight, said process comprising the following steps: a) mixing the sodium carbonate bearing stream (A) with at least a part of a stream (B) to produce a stream (C); b) bicarbonating the stream (C) with a gas (D) comprising CO c) separating the aqueous suspension (E) in order to obtain crystals (F) comprising sodium bicarbonate crystals and an aqueous mother liquor (G); d) partly debicarbonating the aqueous mother liquor (G) and removing part of the water to obtain the stream (B) and an optional gas (H); e) recycling at least a part of the stream (B) to step a); and f) removing a remainder (I) of the stream (B) which is not recycled to step (a) or a part (J) of the aqueous mother liquor (G) which is not partly debicarbonated in step d) to be further processed.