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Method for preparing anhydrous sodium sulfite using industrial by-product anhydrous sodium sulfate

A technology of anhydrous sodium sulfite and anhydrous sodium sulfate, which is applied in the field of preparation of anhydrous sodium sulfite, can solve problems such as social hazards, waste of resources, and environmental pollution, and achieve the effects of increasing economic benefits, strengthening environmental protection, and reducing production costs

Inactive Publication Date: 2006-04-26
吕国锋
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Problems solved by technology

[0002] At present, in the process of chemical production of salicylic acid, formic acid, and washing of tar fractions, industrial wastewater containing sodium sulfate will be produced, which pollutes the environment, wastes resources, increases costs and capital expenditures, and affects the survival of enterprises. detrimental to society

Method used

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  • Method for preparing anhydrous sodium sulfite using industrial by-product anhydrous sodium sulfate

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Embodiment Construction

[0028] Refer to attached picture Firstly, industrial sulfur is put into the molten sulfur tank 1 to be melted to a liquid state, and kept warm to 135-140°C, and then the sulfur pump is used to pass through the filter device 2 to the sulfur furnace 3 in the form of mist, and after being dried by the air blower 10 and the dryer 11, it is passed through the furnace. Enter the air of sulfur incinerator 3 to carry out mixed combustion together, the weight of its sulfur is 1 kilogram, and air is 380 cubic meters, and control temperature is at 800~1000 ℃, makes the volume content of sulfur dioxide in furnace gas at 19~21%, then will The furnace gas is cooled and purified by the cooler 4, and the temperature of the furnace gas is controlled at 40-50°C; then 390 kg of sodium sulfite mother liquor, 3,300 kg of evaporated condensed water and quicklime are mixed and digested into the ash reduction device 12 to form a suspension of ash. The ash suspension contains calcium hydroxide Ca(OH) ...

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Abstract

The process of preparing anhydrous sodium sulfite with industrially co-produced anhydrous sodium sulfate includes: introducing SO2 gas produced through burning sulfur in air into the acidifying unit for reaction with suspension inside the acidifying unit, adding industrially co-produced anhydrous sodium sulfate in certain amount, filtering out calcium sulfate precipitate to obtain sodium sulfite, adding certain amount of sodium carbonate via stirring to obtain sodium sulfite solution, centrifugally separating to eliminate impurity to obtain refined sodium sulfite solution, vacuum evaporation to concentrate, crystallization, separating mother liquid and vacuum drying to obtain anhydrous sodium sulfite product, and reusing the condensated water and mother liquid. The process utilizes the industrially co-produced anhydrous sodium sulfate effectively, and is environment friendly.

Description

technical field [0001] The invention relates to a method for preparing anhydrous sodium sulfite with industrial by-product anhydrous sodium sulfate. Background technique [0002] At present, in the process of chemical production of salicylic acid, formic acid, and washing of tar fractions, industrial wastewater containing sodium sulfate will be produced, which pollutes the environment, wastes resources, increases costs and capital expenditures, and affects the survival of enterprises. Unfavorable and harmful to society. Contents of the invention [0003] The technical problem to be solved by the present invention is to overcome the disadvantages of not treating the existing industrial wastewater containing sodium sulfate, polluting the environment, and wasting resources, and provide a kind of industrial by-product anhydrous sulfuric acid that has no environmental pollution and saves resources. Sodium prepares the method for ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01D5/14
Inventor 吕国锋
Owner 吕国锋
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