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Method for removing free chlorine in dilute sulfuric acid

A technology of dilute sulfuric acid and free chlorine, which is applied in the chemical industry and can solve the problems of high equipment material requirements, strong corrosion, and inability to meet the requirements of chlorine gas drying.

Inactive Publication Date: 2015-09-09
WUHU RONGHUI CHEM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Drying treatment usually uses 98% concentrated sulfuric acid to dry the wet chlorine gas. After the concentrated sulfuric acid absorbs the moisture in the chlorine gas, the concentration gradually decreases. When the concentration is diluted to about 75%, it cannot meet the requirements of chlorine gas drying. At this time, the sulfuric acid Become dilute sulfuric acid, can not continue to use
[0004] At present, the dilute sulfuric acid produced by most domestic chlor-alkali factories is mostly sold in the form of export. Since the dilute sulfuric acid produced by chlor-alkali enterprises contains a large amount of free chlorine, it is highly corrosive and has high requirements for equipment materials and strong stimulation. Sexual smell makes downstream customers "stay away"

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  • Method for removing free chlorine in dilute sulfuric acid

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Embodiment 1

[0022] A method for removing free chlorine in dilute sulfuric acid, comprising the following steps:

[0023] (1), 8m of dilute sulfuric acid from the chlor-alkali-chlor-hydrogen drying section 3 / h, pumped into the upper part of the dechlorination circulation tower for spraying or pumped into the dilute sulfuric acid storage tank and then injected into the upper part of the dechlorination circulation tower for spraying, 2m from the compressed air entering the lower part of the dechlorination circulation tower 3 / h Reverse contact to remove chlorine gas, the removed chlorine gas enters the absorption tower, and is absorbed by caustic soda to generate sodium hypochlorite;

[0024] (2), dilute sulfuric acid 11m after dechlorination in step (1) 3 , wherein the content of free chlorine is about 20Kg, pumped into the filter circulation tank, and the dechlorination agent Na is added in the filter circulation tank 2 SO 3 28Kg, and continuously circulate dilute sulfuric acid for 10 ...

Embodiment 2

[0026] A method for removing free chlorine in dilute sulfuric acid, comprising the following steps:

[0027] (1), 8m of dilute sulfuric acid from the chlor-alkali-chlor-hydrogen drying section 3 / h, pump into the upper part of the dechlorination circulation tower for spraying or pump into the dilute sulfuric acid storage tank and then pour into the upper part of the dechlorination circulation tower for spraying, and enter the dry nitrogen 2m from the lower part of the dechlorination circulation tower 3 / h Reverse contact to remove chlorine gas, the removed chlorine gas enters the absorption tower, and is absorbed by caustic soda to generate sodium hypochlorite;

[0028] (2), dilute sulfuric acid 11m after dechlorination in step (1) 3 , wherein the content of free chlorine is about 20Kg, pumped into the filter circulation tank, and the dechlorination agent Na is added in the filter circulation tank 2 SO 3 35Kg, and continuously circulate dilute sulfuric acid for 10 to 20 cyc...

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Abstract

The invention discloses a method for removing free chlorine in dilute sulfuric acid, which comprises the following steps: removing chlorine by circularly blowing air (or nitrogen) to lower most chlorine dissolved in dilute sulfuric acid; and completely removing the free chlorine in the dilute sulfuric acid by using sodium sulfite as a chlorine remover. The treatment technique is simple and feasible, and is convenient to operate. The method can enhance the quality of the dilute sulfuric acid, is beneficial to the use of the downstream customers, and has important meanings for environmental protection.

Description

technical field [0001] The invention relates to the field of chemical industry, in particular to a method for removing free chlorine in dilute sulfuric acid. Background technique [0002] Sulfuric acid is an important chemical raw material, which is widely used in chemical, petroleum, iron and steel, nonferrous metallurgy, atomic energy and other industrial sectors, and plays an important role in modern industrial production. With the rapid development of these industries, the consumption of sulfuric acid is increasing year by year, so the discharge of dilute sulfuric acid is also increasing. The recycling of dilute sulfuric acid is not only beneficial to environmental protection, but also has a very important significance for the rational use of resources. and function. [0003] In the process of chlor-alkali production, the chlorine gas coming out of the electrolyzer has high temperature and high water content. It must be cooled and dried before it can be sent to the subs...

Claims

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Application Information

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IPC IPC(8): C01B17/90
Inventor 章斯淇洪虹李永毛钟海沈佐汉张国府
Owner WUHU RONGHUI CHEM IND