Production process of sodium pyrosulfite

Abstract

The invention discloses a production process of sodium pyrosulfite. The production process comprises the following steps: combusting fluidized sulfur powder in the air to generate mixed SO2 gas; washing out sulfur steam and SO3 in the mixed gas by using clear water; reacting the purified SO2 gas with a pure alkali solution to obtain a sodium pyrosulfite oversaturated solution; centrifugally separating the oversaturated solution by using a centrifuging machine; recycling the centrifuged mother solution; drying the centrifuged solid by using hot air to obtain a sodium pyrosulfite product; and packing and warehousing the product to obtain commodity sodium pyrosulfite. The product produced by using the production process is high in yield, the product purity is high, and the raw material utilization ratio is high; and moreover, the process flow is simple, the mother solution and energy are recycled repeatedly, the energy consumption in a production process is lowered greatly, the aims of saving energy and reducing emission are fulfilled, the production cost is lowered, and the economical benefit is remarkably increased.

Description

technical field [0001] The invention relates to the field of chemical product production, in particular to a production process of sodium metabisulfite. Background technique [0002] Sodium metabisulfite plays a very important role in food, printing, pharmaceutical and other industries, and with the development of economy, the demand for sodium metabisulfite is also increasing. At present, the production process of sodium metabisulfite is mainly two kinds of wet method and dry method, and the dry method is to convert SO 2 It is made by passing through the block of soda ash solid, and the wet method is to mix SO 2 Into sodium bisulfite obtained by centrifugal drying. Wet production of sodium metabisulfite products has higher quality and less raw material consumption than dry products, but this method has low yield, less recycling of raw materials and energy in the production process, high total energy consumption, and low economic benefits. Contents of the invention [0...

AI Technical Summary

Problems solved by technology

Wet production of sodium metabisulfite products is now of higher quality and less raw material consumption than dry products, but this method has low yield, less recycling of raw materials and energy in the production process, large total energy consumption, and low economic benefits

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