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Method for preparing industrial anhydrous sodium sulfate

An anhydrous sodium sulfate, an industrial-grade technology, applied in the field of preparation of industrial-grade anhydrous sodium sulfate, can solve the problems of wasting sodium sulfate resources, pollute the environment, etc., and achieve the advantages of alleviating environmental pollution problems, high recovery efficiency, and reducing production costs. Effect

Inactive Publication Date: 2011-04-06
陈君华
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Most enterprises directly discharge the sodium sulfate-rich waste liquid generated in the production process as wastewater, which not only pollutes the environment but also wastes precious sodium sulfate resources

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] The method for preparing industrial grade anhydrous sodium sulfate includes the following process steps:

[0029] (1) Using mixed cellulose microporous membrane (Φ≤0.15μm), the waste liquid containing 5% sodium sulfate from the white carbon black prepared by sulfuric acid precipitation method is filtered to remove the white carbon black and other solid residues in the waste liquid , Get the filtrate;

[0030] (2) Take 2000 mL of the above-mentioned filtrate and distill and concentrate it to a quarter of the volume of the filtrate to obtain 500 mL of concentrated solution;

[0031] (3) Add 500 mL of methanol with a concentration of 95% to the concentrated solution obtained in step (2), and stir to make sodium sulfate supersaturate and precipitate;

[0032] (4) Separate the supersaturated precipitated sodium sulfate by suction filtration, and then dry the obtained sodium sulfate at 110°C for 3 hours to obtain 71.3 g of industrial grade anhydrous sodium sulfate;

[0033] (5) Distil...

Embodiment 2

[0035] The method for preparing industrial grade anhydrous sodium sulfate includes the following process steps:

[0036] (1) Using mixed cellulose microporous filter membrane (Φ≤0.15μm), the waste liquid containing 7% sodium sulfate from the white carbon black prepared by sulfuric acid precipitation method is filtered to remove the white carbon black and other solid residues in the waste liquid , Get the filtrate;

[0037] (2) Take 3000 mL of the above-mentioned filtrate and distill and concentrate it to one third of the volume of the filtrate to obtain 1000 mL of concentrate;

[0038] (3) Add 700 mL of methanol with a concentration of 85% to the concentrated solution obtained in step (2), and stir to make sodium sulfate supersaturate and precipitate;

[0039] (4) Separate the supersaturated precipitated sodium sulfate by suction filtration, and then dry the obtained sodium sulfate at 150°C for 1 hour to obtain 132.7 g of industrial-grade anhydrous sodium sulfate;

[0040] (5) Distill ...

Embodiment 3

[0042] The method for preparing industrial grade anhydrous sodium sulfate includes the following process steps:

[0043] (1) Using mixed cellulose microporous filter membrane (Φ≤0.15μm), the waste liquid containing 10% sodium sulfate prepared by sulfuric acid precipitation method is filtered to remove the solid residues such as white carbon black in the waste liquid , Get the filtrate;

[0044] (2) Take 2000mL of the above-mentioned filtrate and distill and concentrate it to one-half of the volume of the filtrate to obtain 1000mL of concentrated solution;

[0045] (3) Add 1500 mL of methanol with a concentration of 75% to the concentrated solution obtained in step (2), and stir to supersaturate sodium sulfate to precipitate;

[0046] (4) Separate the supersaturated precipitated sodium sulfate by suction filtration, and then dry the obtained sodium sulfate at 120°C for 2 hours to obtain 146.2g of industrial-grade anhydrous sodium sulfate;

[0047] (5) Distill the liquid after sodium sul...

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Abstract

The invention relates to a method for preparing industrial anhydrous sodium sulfate in the technical field of the chemical industry, in particular to a method for preparing industrial anhydrous sodium sulfate from sodium sulfate containing waste liquor which is from the preparation of white carbon black by utilizing a sulfate precipitation method. By adopting the process of distilling and concentrating the waste liquor in one step, the invention uses suitable organic small-molecule alcohol to prepare the industrial anhydrous sodium sulfate through the supersaturated precipitation of the sodium sulfate contained in the waste liquor which is from the preparation of the white carbon black by using the sulfate precipitation method, not only has simple process steps, but also has high sodium sulfate recovery. The invention opens up an effective path for obtaining a sodium sulfate product with less impurity content, high quality, small water content, and the like. Raw material adopted by the method of the invention is the waste liquor which is rich in the sodium sulfate and is from the preparation of the white carbon black by using the sulfate precipitation method so that the production cost is decreased, the problem of environmental pollution caused by the emission of the waste liquor is lessened, and the production process has characteristics of energy saving and environment protection.

Description

Technical field [0001] The invention relates to the preparation of industrial grade anhydrous sodium sulfate in the chemical industry, and particularly relates to a method for preparing industrial grade anhydrous sodium sulfate from waste liquid containing sodium sulfate in the preparation of white carbon black by a sulfuric acid precipitation method. Background technique [0002] Anhydrous sodium sulfate is an important inorganic chemical product, which is mainly used in the manufacture of chemical products such as sodium sulfide, sodium sulfide, caustic soda, sodium silicate, etc.; in addition, it is used in non-ferrous metallurgy, electroplating, papermaking, glass, cement, enamel, printing and dyeing , Tanning, synthetic fiber, synthetic detergent and pharmaceutical industries also have a wide range of applications, the market demand is great. At present, the production of industrial grade anhydrous sodium sulfate is mainly prepared by dissolving, filtering, evaporating, and ...

Claims

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Application Information

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IPC IPC(8): C01D5/16C01D5/18
Inventor 陈君华郭雨钱行胡少强
Owner 陈君华
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