Method of removing chlorine gas out of industrial tail gas by using lime milk and catalyst thereof

A technology of industrial tail gas and milk of lime, which is applied in the direction of physical/chemical process catalysts, separation methods, chemical instruments and methods, etc., can solve the problems that calcium hypochlorite cannot reach the end of absorption, corrode equipment, etc., and achieve obvious economic benefits and social benefits Benefits, promote decomposition, and prolong the service life of equipment

Active Publication Date: 2017-05-31
PANZHIHUA STEEL ENTERPRISES XINYU CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The technical problem to be solved by the present invention is: when the existing milk of lime method absorbs chlorine, the absorption end point cannot be reached due to the generation of calcium hypochlorite, and the problem of corrosion of equipment

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Example 1 The method of the present invention is used to remove chlorine in the tail gas from the production of titanium tetrachloride

[0036] Fill the absorption tank with lime milk 8m 3 , Weigh 1.04 kg of mixed catalyst (catalyst weight ratio 2.8: 0.8) into a 10 kg plastic bucket, then add 4-6 kg of tap water into the bucket and stir continuously with a wooden stick until the solid catalyst particles are invisible to the naked eye , Put the catalyst liquid bucket next to the absorption tank for standby, and then pass the titanium tetrachloride production tail gas (the chlorine content in the tail gas is 10.3%) into the absorption tank while heating the absorption reaction tank. When the absorption reaction proceeds to 1.0h, the absorption Add a mixed contact catalyst into the tank, control the reaction temperature at 60±2℃, and continue the reaction for 2h; the whole reaction can proceed smoothly. The content of calcium hypochlorite in the absorption tank is determined t...

Embodiment 2

[0037] Example 2 Using the method of the present invention to remove by-product chlorine in the production of ion-exchange membrane caustic soda

[0038] Fill the absorption tank with lime milk 8m 3 , Weigh 1.2 kg of mixed catalyst (catalyst weight ratio 3.0: 0.9) into a 10 kg plastic bucket, then add 6 to 8 kg of tap water into the bucket and stir continuously with wooden sticks until the solid catalyst particles are invisible to the naked eye , Put the catalyst liquid bucket next to the absorption tank for standby, and then pass the ion-exchange membrane caustic soda by-product chlorine into the absorption tank (the content of chlorine in the tail gas is 98.6%) and heat the absorption reaction tank at the same time. Add all the mixed contact catalysts into the tank, control the reaction temperature at 68±2℃, and continue the reaction for 3h; the whole reaction can proceed smoothly. The content of calcium hypochlorite in the absorption tank is determined to be 0.78%, which meets ...

Embodiment 3

[0039] Example 3 The method of the present invention is used to remove chlorine in the tail gas from the production of titanium tetrachloride

[0040] Fill the absorption tank with lime milk 8m 3 , Weigh 1.04 kg of mixed catalyst (catalyst weight ratio 3.2: 1.0) into a 10 kg plastic bucket, then add 4-6 kg of tap water into the bucket and stir continuously with wooden sticks until the solid catalyst particles are invisible to the naked eye , Put the catalyst liquid bucket next to the absorption tank for standby, and then pass the industrial tail gas (chlorine content in the tail gas 15.1%) for the production of titanium tetrachloride into the absorption tank while heating the absorption reaction tank. When the absorption reaction proceeds to 1.5h, Add all the mixed contact catalysts into the absorption tank, control the reaction temperature at 60~70℃, and continue the reaction for 3 hours; the whole reaction can proceed smoothly, and the content of calcium hypochlorite in the abso...

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PUM

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Abstract

The invention belongs to the technical field of chlorine gas adsorption and in particular relates to a method of removing chlorine gas out of industrial tail gas by using lime milk and a catalyst thereof. In order to solve the problems that an absorption end point by an existing lime milk method which absorb chlorine gas cannot be achieved as a result of generation of calcium hypochlorite, and equipment is corroded and the like, the invention provides the method of removing chlorine gas in industrial tail gas by lime milk, wherein a mixed contact catalyst is added when the lime milk absorbs chlorine gas, and the mixed contact catalyst is a mixture of nickel chloride and ferric trichloride. According to the method provided by the invention, by adding the catalyst to reduce generation of calcium hypochlorite and accelerate newly generated calcium hypochlorite to decompose, the concentration of calcium hypochlorite in the lime milk is 1.0% or below, so that smooth production of absorbing chlorine gas by the lime milk is guaranteed, the absorptive amount is great, the service life of the equipment is also prolonged, and the production cost is lowered; meanwhile, the influence of chlorine gas generated by decomposing calcium hypochlorite on physical health of staff can be also reduced; therefore, the method has obvious economical and social benefits.

Description

Technical field [0001] The invention belongs to the technical field of chlorine recovery, and in particular relates to a method for removing chlorine in industrial tail gas by lime milk and a catalyst thereof. Background technique [0002] In the production of titanium tetrachloride, PVC, etc., a proper excess of chlorine is generally required to make the reaction more complete. Therefore, it will lead to Cl in the tail gas such as titanium tetrachloride 2 Exceeded. In order to make the exhaust gas meet the emission standard, the Cl in the exhaust gas should be removed before discharge 2 , The method used by most companies to remove chlorine in tail gas is to prepare CaCl by absorption of lime milk 2 Series products. According to 2Ca(OH) 2 +2Cl 2 =CaCl 2 +Ca(ClO) 2 +2H 2 O. In the production process, calcium hypochlorite is easy to decompose to produce oxygen, so that the absorption system foams and the absorption cannot reach the end point, and the operation is difficult to con...

Claims

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Application Information

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IPC IPC(8): B01D53/75B01D53/80B01D53/86B01D53/68B01J27/128
Inventor 石玉英张建安陈映志
Owner PANZHIHUA STEEL ENTERPRISES XINYU CHEM
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