Sodium D Gluconate

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Sodium d gluconate

Specification

Sodium gluconate is the sodium salt of gluconic acid, renowned for its chelating properties and diverse applications across various industries. It has the chemical formula NaC6H11O7 and a molecular weight of approximately 218-220 g/mol, depending on the source. This compound appears as a white to brown crystalline powder, highly soluble in water, slightly soluble in alcohol, and practically insoluble in ether.

Application

Used as a surface cleaning agent for steel:
When plating bowl, chrome plating, tin plating, nickel plating are needed on the surface of steel to adapt to special purposes, such as manufacturing tinplate, galvanized sheet, surface chrome plating (electricity), etc., the surface of the steel billet needs to be strictly cleaned to ensure that the coating is firmly bonded to the steel surface. At this time, adding sodium gluconate to the cleaning agent will achieve very ideal results. This has been confirmed by major international companies that manufacture tinplate.

Used as a cement admixture

Adding a certain amount of sodium gluconate to cement can increase the plasticity and strength of concrete, and has a blocking effect

Delaying the initial and final setting period of concrete, such as adding 0.15% sodium gluconate, can extend the initial setting time of concrete by more than 10 times, that is, extending the plasticity time of concrete from a few hours to a few days without affecting its fastness. Plasticity and delaying the initial setting time are very important issues in concrete operations, such as construction in high temperature seasons and large-scale engineering operations, where delaying the initial setting time is a difficult problem. Sodium gluconate can effectively solve this problem. In addition, it is quite difficult to bond oil wells at high temperatures. The concrete added with sodium gluconate can be molded within a few hours at a high temperature of 170 ℃, thus successfully solving the above problems. Therefore, sodium gluconate has been widely used as a cement admixture in important construction projects abroad, such as a large number of bridge projects in the Middle East.

In industry, substances containing glucose (such as grains) are generally used as raw materials. Glucose acid is first produced by fermentation from glucose, and then neutralized with sodium hydroxide to obtain sodium gluconate. It can also be synthesized by electrolysis and oxidation. Most of our country adopts the chemical oxidation method - sub bromination oxidation method for production and synthesis.

According to the different types of fermentation enzymes used, fermentation methods can be divided into two stages: one is to use enzymes from Aspergillus Niger, the other is to use acids, and the latter is to use glucose dehydrogenation to form lactones, which are then decomposed.

Sodium gluconate can also be directly fermented from glucose. At this time, the composition of the fermentation base can be: glucose 250-350g/L, magnesium sulfate heptahydrate 0.2-0.3g/L, diammonium hydrogen phosphate or urea 0.4-0.5g/L. This substrate needs to be sterilized. During the fermentation process, the temperature is controlled at 30-32 ℃, the pH is controlled at 5.5-6.5 by 30%~50% sodium hydroxide, and the fermentation process lasts for 40~100h. Then, the finished product is obtained by filtering and washing to remove microorganisms, decoloring with activated carbon, filtering, concentrating the results or drying with spray.

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