Solvay Sa

Hugo Walravens

Alain Vandendoren

Karine Cavalier

Eric Pierre Dubois

Kurt Allen

Thoi-Dai Chau

Perrine Davoine

Jean-Paul Coquerel

Eric Vandervorst

Ines Hurtado Domingez

Salvador Asensio

Gérard Dupont

A process for producing sodium bicarbonate from a sodium carbonate bearing stream (A) comprising at least 2% sodium chloride and/or sodium sulfate by weight, a part of such stream (A) being generated by a sodium carbonate crystallizer, comprising: a) mixing the stream (A) with part of a stream (B) to produce a stream (C); b) bicarbonating the stream (C) with a gas (D) comprising COto produce an aqueous suspension (E) containing crystals (F) comprising sodium bicarbonate crystals; c) separating the aqueous suspension (E) to obtain crystals (F) comprising sodium bicarbonate crystals and an aqueous mother liquor (G); d) partly debicarbonating such liquor (G) and removing part of the water to obtain the stream (B) and an optional gas (H); e) recycling at least part of the stream (B) to step a); and f) removing the remainder of the stream (B) or part of the aqueous mother liquor (G) to be further processed.

Process for producing sodium bicarbonate

A process for producing sodium bicarbonate from a sodium carbonate bearing stream (A) comprising sodium carbonate and an alkaline metal salt impurity at a concentration C(A), comprising: a) mixing the stream (A) with part of a stream (B), b) bicarbonating the resulting mixed stream with a gas comprising COto produce an aqueous suspension comprising sodium bicarbonate crystals (F), c) separating the sodium bicarbonate crystals (F) from the aqueous liquor (G), d) partly debicarbonating at least part of (G) and removing part of the water of (G) to obtain the stream (B) with the salt impurity at a concentration C(B), e) recycling part of the stream (B) to step a) so that the ratio of the concentrations C(B)/C(A) of the impurity is at least: 1.4, and f) removing the remainder (I) of the stream (B) or the remainder (J) of the liquor (G) to be further processed.

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Meise, Belgium

Hugo Walravens