公开(公告)号：US20180230018A1

公开(公告)日：2018-08-16

申请号：US15761896

申请日：2016-09-22

Applicant: Solvay SA

Inventor： James C. KISIELEWSKI ,  David M. HANSEN ,  Keith O. HAYES ,  Mayra MUCI-CASTANEDA ,  Alain VANDENDOREN

IPC: C01D7/40 ,  C01D7/24 ,  C01D7/10

CPC classification number: C01D7/40 ,  C01D7/10 ,  C01D7/24

Abstract: A process for producing crystalline sodium bicarbonate, comprising: providing an aqueous sodium-bicarbonate containing liquor originating from a reactive crystallization step in which first sodium bicarbonate crystals are produced and recovered; feeding at least a portion of said aqueous sodium-bicarbonate containing liquor to a cooling crystallization unit to form second sodium bicarbonate crystals and produce a crystals slurry comprising the second sodium bicarbonate crystals; and withdrawing a portion of the crystals slurry from the cooling crystallization unit for the withdrawn second sodium bicarbonate crystals to be further processed. A portion of the second sodium bicarbonate crystals withdrawn from the cooling crystallization unit may be fed to a sodium bicarbonate reactive crystallization unit, to a caustic unit, or may be separated and dried. The reactive crystallization, separation and/or drying units where the second sodium bicarbonate crystals are further processed may be the same units where the first sodium bicarbonate crystals are processed.