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Method for producing ammonium sulfate by using industrial waste sulfuric acid

A waste sulfuric acid and ammonium sulfate technology, applied in chemical instruments and methods, ammonia compounds, inorganic chemistry, etc., can solve the problems of low treatment cost, high investment cost, cumbersome operation, etc., achieve low treatment cost, avoid excessive COD, Simple operation effect

Inactive Publication Date: 2019-04-19
SHANDONG WEIFANG RAINBOW CHEM
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Aiming at the disadvantages of high investment cost and cumbersome operation in the existing method for waste sulfuric acid treatment, the present invention provides a method for producing ammonium sulfate by using industrial waste sulfuric acid. The method is simple in operation, low in energy consumption and short in process. The treatment cost is low, the crystallization mother liquor can be recycled, no secondary treatment is required, and it has great economic and environmental benefits

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  • Method for producing ammonium sulfate by using industrial waste sulfuric acid

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Effect test

Embodiment 1

[0024] Process flow of the present invention such as figure 1 As shown, the specific steps are as follows:

[0025] Get 1313g of waste sulfuric acid with a mass fraction of 47.69%, add tap water, dilute to 1431g, then pass the diluted waste sulfuric acid through an activated carbon absorption tower, remove organic matter therein, after activated carbon treatment, the COD value in the waste sulfuric acid is 9mg / L;

[0026] Put the waste sulfuric acid after the above treatment into the two-stage spray tower. The steps are: the waste sulfuric acid is sprayed circularly in the first-stage spray tower, and at the same time, ammonia gas is introduced from the bottom of the first-stage spray tower to adjust the spray speed of the waste sulfuric acid. and ammonia enter the speed, keep the pH in the tower at 2.3, and the temperature at 25-30°C, stop spraying when white crystals are precipitated in the tower, and then start circulating spraying of waste sulfuric acid in the secondary sp...

Embodiment 2

[0030] Take 100g of waste sulfuric acid with a mass fraction of 47.69%, and pass it through an activated carbon absorption tower to remove organic impurities. After adsorption, the COD of waste sulfuric acid is 9.6mg / L.

[0031] Mix the treated waste sulfuric acid with 160.85g of the previous batch of mother liquor, and enter the two-stage spray tower. The steps are: first, the waste sulfuric acid is circulated and sprayed in the first-stage spray tower, and at the same time, ammonia is injected from the bottom of the first-stage spray tower. Gas, adjust the spraying speed of waste sulfuric acid and the entering speed of ammonia gas, keep the pH in the tower at 2.5, and the temperature at 25-30°C, stop spraying when white crystals are precipitated in the tower, and then put the waste sulfuric acid in the secondary spray tower Start circulating spraying in the middle, ammonia gas continues to enter the secondary spray tower to react, keep the pH in the tower at 2.5, and the temp...

Embodiment 3

[0035] Take 71.0 g of waste sulfuric acid with a mass fraction of 47.69%, and pass it through an activated carbon absorption tower to remove organic impurities. After adsorption, the COD of waste sulfuric acid is 8.9 mg / L.

[0036]Mix the treated waste sulfuric acid with 183.74g of the previous batch of mother liquor, and enter the two-stage spray tower. The steps are: first, the waste sulfuric acid is circulated and sprayed in the first-stage spray tower, and at the same time, ammonia is injected from the bottom of the first-stage spray tower. Gas, adjust the spraying speed of waste sulfuric acid and the speed of ammonia gas entry, keep the pH in the tower at 3.0, and the temperature at 25-30°C, stop spraying when white crystals are precipitated in the tower, and then put the waste sulfuric acid in the secondary spray tower Start circulating spraying in the middle, ammonia gas continues to enter the secondary spray tower to react, keep the pH in the tower at 3.0, and the tempe...

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Abstract

The invention discloses a method for producing ammonium sulfate by using industrial waste sulfuric acid. The method firstly treats the waste sulfuric acid with activated carbon, reduces the content oforganic matters therein, and makes ammonia react with the waste sulfuric acid to form the ammonium sulfate. The ammonium sulfate is obtained by cooling and devitrification, which is simple, convenient and easy to operate, and avoids the shortages of high COD and high energy consumption of a mother liquor caused by the ammonium sulfate obtained by high-temperature concentration means such as MVR and the like, it is not necessary to add an oxidant to remove organic matters in the mother liquor, and the obtained ammonium sulphate meets the specifications required for industrial grade ammonium sulphate products. The mother liquor after separation of the ammonium sulfate can be reused, do not cause secondary pollution, improve the yield of the ammonium sulfate, can dilute the concentration ofthe waste sulfuric acid, avoid a large amount of neutralization heat during spraying and reduce energy consumption.

Description

technical field [0001] The invention relates to a method for producing ammonium sulfate by utilizing industrial waste sulfuric acid, and belongs to the technical field of waste sulfuric acid reuse. Background technique [0002] With the rapid advancement of my country's industrialization, the production of industrial waste sulfuric acid is increasing, and the resource treatment of waste sulfuric acid is becoming increasingly important. At present, the main treatment methods for waste sulfuric acid in China are: concentration, pyrolysis, resin adsorption, reducing agent, etc. The above methods have many problems such as high investment cost, large environmental pollution, low production efficiency, and difficult operation. [0003] Patent CN 105668524 A discloses a method for pyrolyzing sulfuric acid by using various fuels such as natural gas and liquefied gas. This method reduces the generation and discharge of acid-containing sewage and improves the recovery efficiency of w...

Claims

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Application Information

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IPC IPC(8): C01C1/242
CPCC01C1/242
Inventor 孙国庆侯永生庞立飞宋伟李盼盼
Owner SHANDONG WEIFANG RAINBOW CHEM
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