| 摘要 |
<p>A process is provided for preparing sodium bicarbonate, in which an aqueous sodium chloride solution and an organic solution of an amine which is insoluble in water are mixed, the resulting mixture is treated with a gas containing carbon dioxide to form an aqueous sodium bicarbonate suspension and an organic solution of amine hydrochloride and the aqueous sodium bicarbonate solution is treated to separate the solid sodium bicarbonate present in it and a mother liquor. The process of the invention is characterized in that the mother liquor is treated with at least part of the organic solution of the amine hydrochloride, the carbon dioxide formed is taken off and an aqueous, dilute sodium chloride solution and an organic amine solution are obtained separately, rock salt is added to the dilute sodium chloride solution and the resulting concentrated aqueous sodium chloride solution and the organic amine solution are returned to the abovementioned mixture.</p> |
