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Method of removing free chlorine from waste sulfuric acid in chlorine-alkali industrial production

A waste sulfuric acid and free chlorine technology, which is applied in the direction of sulfur trioxide/sulfuric acid, sulfate/bisulfate preparation, alkali metal chloride, etc., can solve the problems that free chlorine cannot be removed, and achieve environmental protection benefits and eliminate Toxic and oxidative effects

Inactive Publication Date: 2018-12-07
莘县华祥盐化有限公司
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  • Abstract
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AI Technical Summary

Problems solved by technology

This system is mainly composed of concentration kettle, reboiler, vacuum pump, tail gas tower, etc. Secondly, simple air stripping equipment is used to add waste sulfuric acid into the dechlorination kettle, and then blow compressed air into the waste sulfuric acid to take away the dissolved Chlorine gas, the traditional method is to remove free chlorine by physical method, although it also has a certain removal effect on free chlorine, but it cannot completely remove free chlorine in waste sulfuric acid

Method used

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Embodiment Construction

[0016] Concrete steps of the present invention are further described below by embodiment:

[0017] A method for removing free chlorine with waste sulfuric acid in the industrial production of chlor-alkali is carried out according to the following steps:

[0018] Step 1: the concentration of waste sulfuric acid in the chlorine gas treatment post was tested and analyzed to be 76% (mass fraction), the free chlorine content was 0.089% (mass fraction in terms of chlorine), and the density was 1652kg / m3;

[0019] Step 2: Pour 1,000 liters of waste sulfuric acid into a 1,500 liter dechlorination kettle and stir, and control the negative pressure at -70KPa at room temperature. After 1 hour, take a sample and analyze the free chlorine content to be 0.06% (calculated as chlorine mass fraction) ;

[0020] Step 3: Slowly add sodium sulfite (10% by mass) dropwise from the sodium sulfite header tank to the dechlorination kettle, the total amount of addition is 0.05 cubic meters. Due to the...

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Abstract

The invention discloses a method of removing free chlorine from waste sulfuric acid in chlorine-alkali industrial production. The method comprises the following steps: testing and analyzing the wastesulfuric acid from a chlorine gas treatment station; pumping the waste sulfuric acid into a dechlorination kettle, stirring, carrying out vacuum dechlorination, dropwise adding a sodium sulfite solution treated by a sodium sulfite header tank so as to convert the free chlorine into sodium chloride, and dropwise adding hydrogen peroxide through a hydrogen peroxide header tank so as to oxidize the excess sodium sulfite in the solution into the sodium sulfate. The method has the beneficial effects that the method can completely remove the free chlorine from the waste sulfuric acid, eliminates thetoxicity and oxidizability of the waste sulfuric acid, can realize the dechlorination and resource cyclic utilization of chloride-containing waste sulfuric acid and can obviously improve the environmental protection benefits and resource benefits of enterprises.

Description

technical field [0001] The invention belongs to the field of chemical industry, and in particular relates to a method for removing free chlorine with waste sulfuric acid in chlor-alkali industrial production. Background technique [0002] In the production process of chlor-alkali products, the chlorine gas produced by electrolysis is washed and purified, cooled to remove water, and then further absorbed and dried with 98% concentrated sulfuric acid (GBT534-2014), so that the moisture in the chlorine gas is reduced to below 50ppm, and then enters the chlorine gas liquefaction station , while the chlorine gas is drying, the water absorption concentration of concentrated sulfuric acid is reduced to 75-80%, and the water content is about 20-25%. Due to the certain solubility of chlorine gas in water, there is a small amount of free chlorine in the dilute sulfuric acid, which is about 1000-2000PPm, with toxicity and strong oxidizing properties, its application in chemical product...

Claims

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Application Information

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IPC IPC(8): C01B17/90C01D3/04C01D5/04
CPCC01B17/90C01D3/04C01D5/04
Inventor 李耀军萧军梁云敬黄石显肖红杰
Owner 莘县华祥盐化有限公司
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