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Process for preparing magnesium sulphate heptahydrate in treatment of industrial waste sulphuric acid liquid

A technology of magnesium sulfate heptahydrate and waste sulfuric acid, applied in magnesium sulfate and other directions, to achieve the effects of high recovery rate, significant social benefits and less investment

Inactive Publication Date: 2009-02-18
苏州麒麟医药化学研发有限公司
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

The wastewater is neutral, and the COD value meets the requirements of environmental protection and can be discharged directly, so that the waste sulfuric acid can be recycled, which solves the discharge problem of a large amount of waste sulfuric acid and reduces the pollution to the environment

Method used

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  • Process for preparing magnesium sulphate heptahydrate in treatment of industrial waste sulphuric acid liquid

Examples

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Effect test

Embodiment 1

[0016] The following examples describe the inventive content of the invention. This example utilizes the waste acid produced in the process of producing m-hydroxybenzoic acid and 4-hydroxybiphenyl sulfonated alkali fusion as a raw material to produce magnesium sulfate heptahydrate. 1388g was put into a 2000ml round bottom flask with stirring, slowly added 200g of magnesia containing 85% magnesia, stirred for 30min, adjusted the pH of the reaction solution to make it 7, and continued to stir to make it fully react. After the reaction is completed, add 0.1 g of polysilicon aluminum ferric chloride to the reactor for sedimentation, impurity removal and decolorization, stir for 15 minutes, and filter to obtain the filter residue cationic polyacrylamide, and the mud and mechanical impurities removed by sedimentation. The obtained mother liquor was cooled naturally, crystals were precipitated, and 1045.5 g of white crystals of magnesium sulfate heptahydrate were obtained by filtrati...

Embodiment 2

[0018] Add 120L of sulfonated alkali-melted waste sulfuric acid with a concentration of 30% and 59.8kg of magnesia containing 85% magnesia in a 200L reactor, start stirring, let it react for 1 hour, adjust the pH of the reaction solution to make it 7, continue Stir to fully react. After fully functioning, add 12g of cationic polyacrylamide to the reaction solution for sedimentation, impurity removal and decolorization. After stirring for 30 minutes, put the solution mixed with cationic polyacrylamide into the plate and frame filter press with a high-pressure pump to remove the cationic polyacrylamide. Acrylamide and mud and mechanical impurities removed by sedimentation. 10.47 kg of filter residue and 312.6 kg of magnesium sulfate filtrate were separated by plate and frame pressure filtration, and the obtained filtrate was naturally cooled to precipitate crystals. The above mixed solution is placed in a centrifuge and filtered to obtain wet magnesium sulfate heptahydrate crys...

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Abstract

The invention provides a method for producing the magnesium sulfate heptahydrate, which is characterized in that the waste sulfuric acid that is generated in the sulfonation alkaline fusion process is adopted as the raw material; the waste sulfuric acid solution is mixed with magnesia, so that the ion exchanging reaction can be adequately performed; after the adequate reaction, flocculating agent is adopted for precipitation, foreign matters removal and the color removal, and then the solution is compressed and filtered by a framework to get the magnesium sulfate clear solution; the magnesium sulfate clear solution is cooled down, crystallized and centrifugally filtered to get the solid magnesium sulfate heptahydrate. The method not only resolves the problems of the vast discharging of the waste sulfuric acid, but also can produce the product of the magnesium sulfate from the waste sulfuric acid solution; moreover, the method has less investment, simple craftwork and high recycling rate, thereby having remarkable social benefit and economic benefit.

Description

technical field [0001] The invention provides a production method of novel magnesium sulfate heptahydrate. It is characterized in that the waste sulfuric acid produced in the process of sulfonation alkali fusion is used as raw material to produce magnesium sulfate heptahydrate. Background technique [0002] The invention of the method is to produce a large amount of waste sulfuric acid during the industrial production of m-hydroxybenzoic acid and 4-hydroxybiphenyl sulfonation alkali fusion process. If the large amount of waste sulfuric acid is not treated, it will bring great environmental protection problems. Contents of the invention [0003] In order to deal with these waste sulfuric acid, the technical scheme adopted in the invention of the method is to utilize magnesia and sulfuric acid to fully carry out the method of ion exchange reaction, so that it generates magnesium sulfate and magnesium sulfate has 7 crystal waters when crystallized, so that it can absorb Most...

Claims

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Application Information

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IPC IPC(8): C01F5/40
Inventor 欧阳念平李伟刘洋沈建明
Owner 苏州麒麟医药化学研发有限公司
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