Preparation method of gluconic acid and its salt
A technology of gluconate and gluconic acid, which is applied in the field of preparation, can solve the problems of difficult recovery of precious metals, poor oxidation selectivity, large consumption of precious metals, etc., and achieve the effects of simple process flow, long catalytic life and cheap raw materials
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Embodiment 1
[0036] Preparation of Calcium Gluconate
[0037] In the liquid phase reaction vessel, according to the mass ratio of glucose and Au in the Au / C catalyst is 500:1, the glucose aqueous solution and the Au / C catalyst are mixed, the concentration of the glucose aqueous solution is 1% by weight, and the temperature of the reaction system is 40°C , feed 400ml / min oxygen, add milk of lime (Ca(OH) 2 ) aqueous solution, the pH value of the reaction solution is maintained at 8, until the pH value of the reaction solution remains unchanged for 20 min, and the reaction ends at this time. Then the solution is filtered by suction, concentrated under reduced pressure, crystallized, and air-dried to obtain the product calcium gluconate.
Embodiment 2
[0039] Preparation of Calcium Gluconate
[0040] In the liquid phase reaction vessel, the mass ratio of glucose and Au in the Au / C catalyst is 1500:1, the glucose aqueous solution and the Au / C catalyst are mixed, the concentration of the glucose aqueous solution is 10% by weight, and the temperature of the reaction system is 45°C , feed 600ml / min oxygen, add milk of lime (Ca(OH) 2) aqueous solution, so that the pH value of the reaction solution is maintained at 8.5 until the pH value of the reaction solution remains unchanged for 20 min, at which point the reaction ends. Then the solution is filtered by suction, concentrated under reduced pressure, crystallized, and air-dried to obtain the product calcium gluconate.
Embodiment 3
[0042] Preparation of Calcium Gluconate
[0043] In the liquid phase reaction vessel, according to the mass ratio of glucose and Au in the Au / C catalyst is 3000:1, the glucose aqueous solution and the Au / C catalyst are mixed, the concentration of the glucose aqueous solution is 20% by weight, and the temperature of the reaction system is 55°C , feed 1000ml / min air, add milk of lime (Ca(OH) 2 ) aqueous solution, the pH value of the reaction solution is maintained at 9, until the pH value of the reaction solution remains unchanged for 20 min, and the reaction ends at this time. Then the solution is filtered by suction, concentrated under reduced pressure, crystallized, and air-dried to obtain the product calcium gluconate.
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