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Cleaner production technology for producing sodium metabisulfite and sodium chloride through saline-alkaline mixed liquor

A sodium pyrosulfite, clean production technology, applied in the preparation of alkali metal sulfite, alkali metal sulfite/sulfite, alkali metal chloride, etc., can solve the problem of high cost of evaporation and separation of salt, and poor product quality control , high cost and other issues, to achieve obvious economic and environmental benefits, realize resource utilization, and reduce production costs

Inactive Publication Date: 2018-10-30
河南元亨精细化工有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This part of wastewater contains sodium carbonate with high value, but due to the large amount of sodium chloride, the cost of evaporation and separation of salt is too high, and the product quality is not easy to control
Some units adopt the method of re-injection, resulting in a decline in the exploitability of alkali ore resources, often outweighing the gains.
At present, there is no resource utilization process application, and most of them are neutralization discharge treatment: the cost of neutralization is very high, and the discharge of high salt water also causes a huge burden on the environment

Method used

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  • Cleaner production technology for producing sodium metabisulfite and sodium chloride through saline-alkaline mixed liquor

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Effect test

Embodiment 1

[0018] See attached figure 1 , the clean production technique that saline-alkali mixed liquor of the present invention produces sodium metabisulfite and sodium chloride, its steps are as follows:

[0019] 1) Heat 1000kg of saline-alkali mixed solution (containing 100kg of sodium carbonate, 30kg of sodium bicarbonate, and 5kg of sodium chloride) to 105°C, and dissolve the NaHCO in the solution 3 converted to Na 2 CO 3 , remove part of CO 2 , to NaHCO in solution 3 The balance is less than 5kg;

[0020] 2) CO removal 2 The final saline-alkali mixture is evaporated and concentrated by MVR (Mechanical Vapor Recompression);

[0021] 3) When the sodium chloride in which the mixed solution is concentrated is close to saturation (sodium chloride saturation solubility 35.9g), the wet product Na is separated by crystallization of the cooling solution. 2 CO 3 Solid; the remaining mother liquor is evaporated twice by MVR. When the sodium carbonate in the evaporation liquid is clos...

Embodiment 2

[0025] See attached figure 1 , the clean production technique that saline-alkali mixed liquor of the present invention produces sodium metabisulfite and sodium chloride, its steps are as follows:

[0026] 1) Heat 1000kg of saline-alkali mixed solution (which contains 80kg of sodium carbonate, 70kg of sodium bicarbonate, and 6kg of sodium chloride) to 115°C, and dissolve the NaHCO in the solution 3 converted to Na 2 CO 3 , remove part of CO 2 , to NaHCO in solution 3 The balance is less than 3kg;

[0027] 2) CO removal 2 The final saline-alkali mixture is evaporated and concentrated by MVR (Mechanical Vapor Recompression);

[0028] 3) When the sodium chloride in which the mixed solution is concentrated is close to saturation (sodium chloride saturation solubility 35.9g), the wet product Na is separated by crystallization of the cooling solution. 2 CO 3 Solid; the remaining mother liquor is evaporated twice by MVR. When the sodium carbonate in the evaporating liquid is c...

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Abstract

The invention discloses a cleaner production technology for producing sodium metabisulfite and sodium chloride through saline-alkaline mixed liquor and belongs to the field of environmental resource protection in chemical production. According to the technology, the method for multistage salt separation and staged utilization is adopted in the production process, sodium carbonate and sodium chloride in the mixed waste liquor are converted into products such as sodium metabisulfite and sodium chloride, and resource-based value-added utilization of the waste liquor is realized. The method is high in product quality, low in equipment input, low in cost and zero in wastewater and waste residue emission, and belongs to the cleaner production technology.

Description

technical field [0001] The invention relates to a clean production process for producing sodium pyrosulfite and sodium chloride from a saline-alkali mixed solution, belonging to the field of resource and environmental protection in chemical production. Background technique [0002] Na 2 CO 3 , NaHCO 3 As well as inorganic salts such as NaCl, the annual by-product of saline-alkali mixed wastewater in the domestic trona industry alone reaches 3 million tons. This part of wastewater contains sodium carbonate with high value, but due to the large amount of sodium chloride, the cost of evaporation and separation of salt is too high, and the product quality is not easy to control. Some units adopt the method of reinjection, resulting in a decline in the exploitability of alkali ore resources, which is often not worth the candle. At present, there is no resource utilization process application, and most of them are neutralization discharge treatment: the cost of neutralization ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01D5/14C01D3/06
CPCC01D3/06C01D5/145C01P2006/80
Inventor 张又天李梅彤张柯殷守彪
Owner 河南元亨精细化工有限公司
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