Metal catalysis can produce sodium gluconate, calcium gluconate and other products. The production process is as follows:
After the catalytic oxidation, the catalyst is filtered out, and the filtrate is refined.
Organic solvents can be used as amides, aliphatic alcohols, ethers, esters and other compounds. Palladium metal is usually used as catalyst, and palladium alloy can also be used as catalyst.
In this process, PD and Pd alloy multi metal catalysts are used for catalytic oxidation, which are preheated to 45 ℃ in sugar solution for jet pump circulating oxidation;
When the pH of the solution drops, 40% sodium hydroxide solution can be added to control the rate of the flow alkali solution, keep the pH at 9.0-9.5, and the temperature range at 45-50 ℃. When the pH reaches 8.0 and the amount of residual glucose drops below 1.0%, the 8-10h reaction ends.
After that, the catalyst is separated, refined and filtered, exchanged with cation resin, and neutralized with calcium oxide or calcium hydroxide.
The technological characteristics of the preparation of sodium gluconate by metal catalysis are as follows:
Using the metal catalyst of glucose solution, the process is simple and can synthesize gluconate (sodium or calcium) in one step, but this process is restricted by the metal catalyst, including the price of the catalyst, the service life and cost of the catalyst, the purity of the product, etc.
In addition, the conversion rate of the product is also affected by oxygen, temperature, pH, agitation and catalyst quality, and catalytic oxidation must be carried out in a special reaction equipment.
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