What is the difference between the application of industrial grade sodium metabisulfite and food grade sodium metabisulfite

Industrial grade sodium metabisulfite is widely used. Let's follow Weifang Banghua Chemical Co., Ltd. to find out.

　　 1. Can be used to produce insurance powder;

　　 2. Industrial grade sodium metabisulfite can be used in the pharmaceutical industry to purify chloroform, phenylpropyl sulfone, and benzaldehyde; the rubber industry is used as a coagulant; the printing and dyeing industry is used as a dechlorination agent, scouring agent, and mordant for cotton bleaching;

　　 3. The photography industry as a developer;

　　 4. The chemical industry is used to produce hydroxyvanillin, hydroxylamine hydrochloride, etc.;

　　 5. The leather industry is used for leather treatment, making the leather soft, relatively full and tough, with properties such as waterproof, flexural resistance, and wear resistance;

　　 6. Sewage treatment industry as a reducing agent, such as the treatment of wastewater containing hexavalent chromium, and sodium metabisulfite/air method can treat cyanide-containing wastewater, used as wastewater treatment in electroplating industry, oil field, etc.

　　 7. Industrial grade sodium metabisulfite can be used as a mineral dressing agent;

Food grade sodium metabisulfite is a versatile food additive. In addition to bleaching, it also has the following functions:

　　 1) Anti-browning effect. Enzymatic browning often occurs in fruits and potatoes. Food grade sodium metabisulfite is a reducing agent and has a strong inhibitory effect on the activity of polyphenol oxidase.

       0.0001% sulfur dioxide can reduce enzyme activity by 20%, and 0.001% sulfur dioxide can better inhibit enzyme activity and reduce enzyme browning. In addition, it can consume the oxygen in the food tissue and play a role in removing oxygen, that is, sulfurous acid can react with glucose to reduce the reaction of glucose and amino acids in food, thereby preventing browning.

　　 2) Antioxidant effect. Sulfurous acid has good oxidation effect. Sulfite is a strong reducing agent, it can consume oxygen in fruits and vegetables, inhibit the activity of oxidase, and is more effective in reducing the oxidation and destruction of vitamin C in fruits and vegetables.

　　 3) The role of the ripper can be used as a part of the ripper.

　　 4) For corrosion protection, sulfurous acid can play a role in corrosion protection. Insoluble sulfurous acid is believed to inhibit yeast, mold and bacteria. According to reports, the insoluble sulfite inhibits E. coli by a factor of 1,000 times that of sodium bisulfate. The intensity of beer yeast is 100 to 500 times, which is more than that of mold, and it is better to carry microorganisms when sulfur dioxide is acidic.

　　Mechanism of food grade sodium metabisulfite:

　　 bleaching agents can be divided into two categories: oxidizing bleaching agents and reducing bleaching agents. Sodium metabisulfite is a reducing bleach.