It is often said that "sodium gluconate".
What exactly is it?
What exactly does it do?
What about the production process...
Today we walk into its world together,
Learn it!
Sodium gluconate is a common, versatile sodium organic acid salt. Industrial-grade sodium gluconate is commonly used in construction, chemical and other industries. In the construction industry, it can be used as a water reducer and a retarder, because after adding a certain amount of sodium gluconate to the cement, it can increase the plasticity and strength of concrete, and has a blocking effect, which can delay the initial and final solidification time of concrete.
At present, the production methods of sodium gluconate in China mainly include biological fermentation method, double enzyme method and heterogeneous catalytic oxidation method. At present, the biological fermentation method and the double enzyme method are mainly used in domestic large-scale industrial production. Due to the use of heavy metal catalysts, the heterogeneous catalytic oxidation method has a certain degree of toxicity, and the yield and purity are low, and its products are usually not used as food additives for food production, so this production process is basically discontinued. Let's take a closer look at these methods.
Biological fermentation method
Biological fermentation method is a more traditional sodium gluconate production method, of which the more common use of Aspergillus niger fermentation to sodium gluconate process, the advantage is high concentration of primary sugar, high control temperature (concentration of more than 30%, temperature 40 °C, which is a rare of all fermented organic acids), its fermentation process is easy to control, stable and mild production, easy to industrial production. At the same time, the method has the advantages of low cost and easy quality control, and is the main production method for the industrial production of sodium gluconate in China. Its disadvantages are long production cycle (48-56h), production process mycelium is difficult to filter, difficult to process, the number of fermentation equipment is large, the amount of activated carbon is large, etc.
Heterogeneous catalytic oxidation
The process is simple and the reaction is smooth. The disadvantage is that after the catalyst used is recycled a certain number of times, the catalytic efficiency decreases, the reaction time is prolonged or even basically no catalytic activity, and the catalyst must be scrapped and updated, which correspondingly increases the catalyst consumption per unit product, so that the production cost of sodium gluconate products increases. And because metal catalysts have certain toxicity, their products are generally not used as food additives for food production, so the application of products is limited.
Dual enzymatic method
The production of sodium gluconate by double enzyme method is a newly developed method in recent years, which is mainly suitable for large and medium-sized production, and is suitable for liquid sodium gluconate production applications. The enzymatic production of sodium gluconate is an enzymatic reaction with glucose oxidase and catalase and glucose solution, and sodium hydroxide is added during the reaction to finally obtain sodium gluconate. There are many advantages of the enzymatic production process, such as its simple process, mild reaction conditions, high product purity, short production cycle (20-24h), and less equipment than fermentation method.
Compared with several other processes, the double enzyme method of producing sodium gluconate process flow is short, the degree of automation is high, the total investment in equipment is relatively reduced, with the reaction time is greatly shortened, the power consumption is reduced by a large margin, the enzyme reaction process is not worried about bacterial contamination, so there is no need for steam sterilization, steam is basically no consumption; the production process oxygen is reacted, absorbed thoroughly, basically no exhaust emissions, the reaction conversion rate and purity are relatively high, and it is the best process choice for the current domestic old production line to improve the standard and the new production line to improve efficiency and save costs!
A good companion for the dual enzyme method
1. Glucose oxidase (for gluconate production)
Glucose oxidase (for gluconate production) is made by deep fermentation of liquids using Aspergillus niger as a production bacterium. This enzyme is an oxidizing reductase, in the presence of molecular oxygen, specifically oxidizes glucose to produce gluconolactone, while consuming oxygen to generate hydrogen peroxide, gluconolactone further produces gluconic acid.
Tacit Understanding Index ★ ★ ★ ★ ★
1. The application of whole enzyme method to produce gluconate, the final product yield is high, the purity is high, and the service life of the filter membrane can be extended.
2, it has high catalytic efficiency, which can shorten the production cycle and improve production efficiency.
3, its process operation is simple, the reaction conditions are mild, can greatly save production energy consumption.
2. Catalase (for gluconate production)
Catalase (for gluconate production) is a liquid enzyme preparation refined by deep fermentation of Aspergillus niger as a production strain, which can catalyze the decomposition of hydrogen peroxide (hydrogen peroxide) into oxygen and water through the redox reaction of double electron transfer.
1. The whole enzyme method produces gluconate, the final product has high yield and high purity, which can extend the service life of the filter membrane.
2. The whole enzyme process is easy to operate and the reaction conditions are mild, which can greatly save energy consumption in production.
3, it has high enzyme activity, less addition, saving storage space and labor costs.
4, it has high conversion efficiency, Bipu through catalase efficiency increased by 5-10%, can shorten the production cycle, improve production efficiency.
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