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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

Inactive Publication Date: 2005-03-16
KUNMING INST OF PRECIOUS METALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the noble metal consumption of the Pt / C or Pd / C catalyst used in the heterogeneous catalytic oxidation method is large, resulting in high production costs, and the oxidation selectivity of the Pt / C or Pd / C catalyst is poor and easy to be poisoned, and its failure Precious metals in catalysts are difficult to recover

Method used

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Examples

Experimental program
Comparison scheme
Effect test

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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Abstract

The invention relates to the preparation method of gluconic acid and its salt, wherein Au / C catalyst liquid phase catalytic oxidation glucose is employed to synthesize calcium gluconae through calcium hydrate neutralization, based on this, the replacing reaction of magnesium, zinc and ferrous sulfate is utilized to obtain the corresponding glucoheptonates, and glucose acid is obtained through sulfuric acid replacement reaction.

Description

technical field [0001] The invention relates to a preparation method of gluconic acid and its salts, in particular to a preparation method of gluconic acid and its calcium salt, magnesium salt, zinc salt, ferrous salt and the like. Background technique [0002] Gluconic acid and its salts are important organic chemical products with multiple uses. They can be used as food additives and nutritional supplements, complexing agents, cleaning agents for glass and steel surfaces, washing aids, etc., and are widely used in the fields of food, medicine, electroplating, construction, textiles, and daily chemicals. For example: (1) Calcium gluconate is a calcium preparation, which is mainly used clinically for calcium supplementation and treatment of various diseases caused by calcium deficiency. It can promote the calcification of bones and teeth, maintain the normal excitability of neuromuscular, reduce capillary permeability, increase the contractility of capillary wall; prevent c...

Claims

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Application Information

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IPC IPC(8): C07C51/00C07C51/41C07C59/105
Inventor 董守安李品将杨生春
Owner KUNMING INST OF PRECIOUS METALS
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