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APPLICATION AND USE OF SODIUM SULFITE IN PAPER INDUSTRY

With the continuous development of paper industry, secondary fiber recycling is highly valued by paper industry, which can not only save paper cost, but also save forest resources, reduce energy consumption and help environmental protection. Sodium sulfite is a good performance deinking auxiliary, the role in deinking is to prevent the pulp from returning to yellow, and weak alkaline conditions for sodium sulfite deinking is more favorable for the removal of ink. In the absence of surfactants, in the case of 10% pulp concentration under the broken solution, the addition of 2% sodium sulfite has a significant effect. For old newspapers, the use of neutral sodium sulfite for deinking, sodium sulfite dosage of 3% to 4%, can obtain good deinking effect, can reduce the pollution load of wastewater, is conducive to the post-treatment of wastewater.

APPLICATION AND USE OF SODIUM SULFITE IN WATER TREATMENT INDUSTRY

In order to prevent the corrosion of boilers by dissolved oxygen in water, most boiler feed water needs deoxidation treatment. Sodium sulfite is one of the earliest chemical deaerators used to remove dissolved oxygen in water, and is widely used because of its advantages of being an inexpensive, convenient source, non-toxic and fast reaction with oxygen. Sodium sulfite is compounded with a stabilizer and catalyst, which can improve the stability of sodium sulfite and reduce the operating cost. Sodium sulfites reduction treatment method is one of the most environmentally friendly and energy-saving methods in the current chromium-containing wastewater treatment process, which can ensure that the effluent quality can meet the discharge standard and recycle chromium hydroxide, and the equipment and operation are also relatively simple, saving money and floor space.

APPLICATION AND USE OF SODIUM SULFITE IN CHEMICAL INDUSTRY

Sodium sulfite such as sodium bisulfite Cas 7631-90-5 is widely used in the chemical industry as raw material or auxiliary. The boiling reaction of sodium sulfite with sulfur is one of the main methods to produce sodium thiosulfate. In the process of sodium hydroxide removal from light brine production, the addition of Na2SO3 under alkaline conditions can remove the residual free chlorine. Sodium sulfite method is one of the internationally recognized mature and reliable refining methods for TNT industrialization. Sodium sulfite is widely used as a sulfonating agent in the synthesis of fine chemicals. sodium 4-methylbenzenesulfinate is an important intermediate in the synthesis of the new herbicide metsulfuron, which is obtained by the reduction of 4-methylbenzenesulfonyl chloride as raw material by sodium sulfite. Fluorocarbon surfactant is the most surface active surfactant so far. Fluorocarbon alkyl succinate sulfonate surfactant can be produced by esterification and sulfonation steps with octafluoropentanol, maleic anhydride and sodium sulfite as raw materials. Sodium sulfite is compounded with other corrosion inhibitors, which can greatly improve the corrosion inhibition effect.

APPLICATION AND USE OF SODIUM SULFITE IN FOOD INDUSTRY

It can be used as bleaching agent, preservative, relaxing agent, antioxidant, color preservative and freshness preservative in food processing. Sodium sulfite is an inhibitor of polyphenol oxidase (PPO) activity, which can effectively protect fruits and vegetables from browning and improve their added value.

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