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Regeneration method of zinc oxide desulfurizer

A technology of desulfurization agent and zinc oxide, applied in chemical instruments and methods, separation methods, separation of dispersed particles, etc., to achieve good economic benefits, pure by-products, and good oil removal effect

Active Publication Date: 2020-03-27
HUNAN HUANDA ENVIRONMENTAL PROTECTION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Aiming at the deficiencies in the prior art, the present invention provides a regeneration method of zinc oxide desulfurizer to realize the green recovery of the desulfurizer and overcome the problem that the existing regeneration process easily produces a large amount of harmful gas

Method used

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  • Regeneration method of zinc oxide desulfurizer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] A kind of regeneration method of zinc oxide desulfurizer, the steps are as follows:

[0052] (1) Pulverize the waste zinc oxide desulfurizer, sieve it through a 100-mesh sieve, and take the undersieve.

[0053] (2) The undersize is washed with a mixed aqueous solution of polyvinylpyrrolidone and sodium carbonate, and then rinsed with clear water.

[0054] (3) Slowly add 100 g of the washed undersize into the sulfuric acid-hydrogen peroxide-potassium permanganate mixture for dissolving to obtain filtrate and filter residue.

[0055] Wherein, the sulfuric acid-hydrogen peroxide-potassium permanganate mixed solution is the sulfuric acid of 3mol / L by 344mL concentration, 120g concentration is the hydrogen peroxide of 30wt% and 22g concentration is 5wt% potassium permanganate, 1g disodium ethylenediaminetetraacetic acid (EDTA -2Na) mixed.

[0056] (4) The filtrate is precipitated with ammonia water, the pH value needs to be controlled at about 8.0 (±0.2), and after stirrin...

Embodiment 2

[0060] A kind of regeneration method of zinc oxide desulfurizer, the steps are as follows:

[0061] (1) Pulverize the waste zinc oxide desulfurizer, sieve it through a 100-mesh sieve, and take the undersieve.

[0062] (2) The undersize is washed with a mixed aqueous solution of polyvinylpyrrolidone and sodium carbonate, and then rinsed with clear water.

[0063] (3) Slowly add 100 g of the washed undersize into the sulfuric acid-hydrogen peroxide-potassium permanganate mixed solution for dissolving to obtain filtrate and filter residue.

[0064] Wherein, the sulfuric acid-hydrogen peroxide-potassium permanganate mixed solution is 4mol / L sulfuric acid by 258mL concentration, 120g concentration is 30wt% hydrogen peroxide and 22g concentration is 5wt% potassium permanganate, 1g disodium ethylenediaminetetraacetic acid (EDTA -2Na) mixed.

[0065] (4) The filtrate is precipitated with ammonia water, the pH value needs to be controlled at about 8.5 (±0.2), and after stirring for 1...

Embodiment 3

[0069] A kind of regeneration method of zinc oxide desulfurizer, the steps are as follows:

[0070] (1) Pulverize the waste zinc oxide desulfurizer, sieve it through a 100-mesh sieve, and take the undersieve.

[0071] (2) The undersize is washed with a mixed aqueous solution of polyvinylpyrrolidone and sodium carbonate, and then rinsed with clear water.

[0072] (3) Slowly add 100 g of the washed undersize into the sulfuric acid-oxidizing agent mixture for dissolving to obtain filtrate and filter residue.

[0073] Wherein, the sulfuric acid-oxidizing agent mixed solution is the sulfuric acid that 258mL concentration is 4mol / L, 131.75g ​​concentration is the hydrogen peroxide of 30wt%, 30g concentration is 5wt% potassium permanganate, 3g disodium ethylenediamine tetraacetate (EDTA-2Na) mixing made.

[0074] (4) The filtrate is precipitated with ammonia water, the pH value needs to be controlled at about 8.0 (±0.2), and after stirring for 1 hour, filter again, and the precipit...

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Abstract

The invention relates to a regeneration method of a zinc oxide desulfurizer. The method comprises the following steps of pulverizing a zinc oxide desulfurizer to be regenerated to obtain waste desulfurizer powder; washing the waste desulfurizer powder with a mixed aqueous solution of povidone and sodium carbonate, washing with water, mixing the washed waste desulfurizer powder with a sulfuric acidsolution, hydrogen peroxide, a potassium permanganate solution and ethylene diamine tetraacetic acid (EDTA-2Na), reacting for 2-5 hours, and filtering to obtain a filtrate and filter residues; mixingthe filtrate with ammonia water, controlling the pH value to be 7.8-9, stirring for 0.5-3 hours, and filtering to obtain a precipitate; and cleaning, drying and calcining the precipitate to obtain the regenerated zinc oxide desulfurizer. The regeneration method of the zinc oxide desulfurizer is simple and easy to operate, the operation cost is low, the method is free of toxic gas emission and capable of better meeting the environmental protection requirement, the method has wide application range and is suitable for regeneration of the waste zinc oxide desulfurizer, and the regeneration sulfur capacity is high.

Description

technical field [0001] The invention relates to a regeneration method of a zinc oxide desulfurizer, which belongs to the field of preparation and application of gas purifiers. Background technique [0002] Desulfurizers are used to remove free sulfur or sulfide in fuels, raw materials or gas materials, and are widely used in petrochemical, coal chemical, fertilizer, environmental protection and other industries. There are many types of desulfurizer products in the prior art, which can be divided into activated carbon desulfurizers, molecular sieve desulfurizers, manganese oxide desulfurizers, iron oxide desulfurizers, and zinc oxide desulfurizers according to their active components. Among them, the zinc oxide desulfurizer has the characteristics of good desulfurization effect, easy to use, stable performance, and relatively loose requirements on process conditions. [0003] With the continuous progress of our country's economy and society, the protection of the ecological ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/96B01D53/81B01D53/48
CPCB01D53/48B01D53/81B01D53/96
Inventor 彭奔彭晓虎
Owner HUNAN HUANDA ENVIRONMENTAL PROTECTION
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