Sodium gluconate production process

Sodium gluconate production process
In the industry, substances containing glucose (such as grains) are generally used as raw materials. Fermentation is used to obtain gluconic acid from glucose and then neutralize with sodium hydroxide to obtain sodium gluconate. Using electrolysis and oxidation synthesis. Most of our country adopts chemical oxidation method-hypobromide oxidation method for production and synthesis.
According to the different types of fermentation enzymes used, the fermentation method can be divided into two phases. One is to use Aspergillus Niger enzyme and the other is acid. The latter method uses glucose dehydrogenation to form lactones and then decomposes esters.

Sodium gluconate can also be obtained directly from glucose fermentation. At this time, the composition of the fermentation base can be: glucose 250~350g/L, magnesium sulfate heptahydrate 0.2~0.3g/L, diammonium phosphate or urea 0.4~0.5g/L. This substrate must be sterilized. During the fermentation process, the temperature is controlled at 30-32 degrees, the pH is controlled at 5.5-6.5 with 30%-50% sodium hydroxide, and the fermentation process lasts for 40-100h. Then, the microorganisms are removed by filtration and washing, the activated carbon is decolorized, and then filtered, the result is concentrated or spray-dried to obtain the finished product.

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