JP2005041743A5 - - Google Patents

Claims (13)

  In the method of reacting an aqueous solution containing alkali metal ions and carbon dioxide in a predetermined reactor to crystallize alkali metal hydrogencarbonate crystals, a part of the slurry containing the crystals of the aqueous solution is crystallized in the crystallizer A method for producing an alkali metal hydrogen carbonate, wherein a part of the crystal is dissolved and then returned to the crystallizer.   The part of the crystals contained in the slurry is dissolved by making the pressure of the slurry taken out from the crystallizer lower than the pressure of the crystallizer. The manufacturing method of alkali metal hydrogencarbonate of description.   A part of the crystals contained in the slurry is dissolved by blowing air having a volume of 0.2 to 20 times the standard state with respect to the flow rate of the slurry into the slurry taken out from the crystallizer. The method for producing an alkali metal hydrogen carbonate according to claim 1 or 2, wherein   A part of the crystals contained in the slurry is dissolved by adding an aqueous solution containing an alkali metal carbonate and / or hydroxide to the slurry taken out from the crystallizer. The manufacturing method of the alkali metal hydrogencarbonate as described in any one of Claims 1-3.   5. A part of the crystals contained in the slurry is dissolved by adding water to the slurry taken out from the crystallizer. The manufacturing method of the alkali metal hydrogencarbonate described in 2.   The part of the crystals contained in the slurry is dissolved by heating the slurry taken out from the crystallizer, The method according to any one of claims 1 to 5, A method for producing an alkali metal bicarbonate.   The amount of the slurry taken out from the crystallizer is 30 to 200% by mass per hour based on the total amount of slurry in the crystallizer. The manufacturing method of the alkali metal hydrogencarbonate of item.   The method for producing an alkali metal hydrogencarbonate according to any one of claims 1 to 7, wherein the aqueous solution contains an alkali metal carbonate and / or a hydroxide.   The method for producing an alkali metal hydrogencarbonate according to any one of claims 1 to 8, wherein the alkali metal is sodium or potassium.   The production of an alkali metal hydrogen carbonate according to any one of claims 1 to 9, wherein all or part of crystals contained in the slurry taken out from the crystallizer is pulverized. Method.   The method for producing an alkali metal hydrogen carbonate according to claim 10, wherein the composition of the mother liquor of the slurry taken out from the crystallizer has a concentration of the alkali metal hydrogen carbonate below saturation.   The method for producing an alkali metal hydrogen carbonate according to any one of claims 1 to 11, wherein the temperature in the reactor is 50 to 90 ° C. The alkali according to any one of claims 1 to 12, wherein, when taking out a part of the slurry from the crystallizer, larger crystals in the crystallizer are extracted and dissolved. A method for producing a metal carbonate.