A kind of preparation method of sulfur dioxide gas in sugar industry

Abstract

The invention relates to a preparation method of a sulfur dioxide gas in a sugar industry. The preparation method concretely comprises the following steps: adding concentrated sulfuric acid and sulphur to a reaction vessel; after material addition is finished, and heating till the reaction is started to generate the sulfur dioxide gas; cooling the generated sulfur dioxide gas to 60-70 DEG C, wherein the mass ratio of the concentrated sulfuric acid to the sulphur is (5-7):1, and the mass concentration of the concentrated sulfuric acid is 93%-98.3%. The method disclosed by the invention can be used for producing the sulfur dioxide gas by oxidizing elemental sulfur by utilizing the concentrated sulfuric acid, can well solve multiple problems of the sulfur dioxide gas used for preparing sugar through the traditional sulphur combustion, and has the advantages that quantity control of the sulfur dioxide gas is easy to control, and sublimed sulfur of the sulfur dioxide gas is little; the generated sulfur dioxide gas is high in purity, low in oxygen content, low in temperature and easy to cool; raw materials are easily obtained and low in cost and the quantity of the used sulphur is remarkably reduced; a device for preparing the sulfur dioxide gas is simple and small in occupied area.

Description

technical field [0001] The invention relates to a method for preparing sulfur dioxide gas in the sugar industry. Background technique [0002] At present, sugarcane sugar factories generally adopt the sulfite sugar production process. The sulfite sugar production process mainly uses sulfur dioxide gas to react with lime milk to form calcium sulfite precipitates. The calcium sulfite precipitate particles adsorb non-sucrose components to clarify and decolorize sugarcane mixed juice. ; At the same time, sulfur dioxide realizes bleaching by reducing colored substances. Sulfur dioxide gas in sugar factories is generally produced by burning sulfur in the sulfur furnace. The main problems of this method are that the amount of sulfur dioxide gas is difficult to control, the sulfur furnace and corresponding high-temperature sulfur dioxide gas corrode the cooling pipes, and the cooling of high-temperature sulfur dioxide gas requires a large amount of energy. Cooling water, sulfur com...

AI Technical Summary

Problems solved by technology

Sulfur dioxide gas in sugar factories is generally produced by burning sulfur in the sulfur furnace. The main problems of this method are that the amount of sulfur dioxide gas is difficult to control, the sulfur furnace and corresponding high-temperature sulfur dioxide gas corrode the cooling pipes, and the cooling of high-temperature sulfur dioxide gas requires a large amount of energy. Cooling water, sulfur combustion process produces more sublimated sulfur, sulfur combustion process easily produces sulfur trioxide, sulfur furnace workshop covers a large area, and serious environmental pollution, so the preparation of sulfur dioxide gas has always been an important technical problem faced by sugar factories

Although some of the above-mentioned problems can be solved to a certain extent by transforming the traditional sulfur furnace, new problems such as expensive sulfur furnace and prone to failure have arisen.