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Preparation method of sulfuric acid catalyst by sulfur dioxide oxidation

A technology of sulfur dioxide and oxidation production, which is applied in metal/metal oxide/metal hydroxide catalysts, physical/chemical process catalysts, chemical instruments and methods, etc. It can solve the problems of poor performance stability and low catalytic activity, reaching five The effect of low concentration of vanadium oxide, strong catalytic activity and high concentration of vanadium pentoxide

Active Publication Date: 2019-05-17
XIANGYANG JINGXIN CATALYST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the prior art, the catalyst for sulfur dioxide oxidation to sulfuric acid is usually prepared by mixing the active components with the carrier at one time, which has low catalytic activity and poor performance stability.

Method used

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  • Preparation method of sulfuric acid catalyst by sulfur dioxide oxidation

Examples

Experimental program
Comparison scheme
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Embodiment 1

[0026] Embodiment 1: a kind of preparation method of sulfur dioxide oxidation sulfuric acid catalyst, comprises the following steps, step 1, vanadium, get vanadium pentoxide and water, the mass ratio of vanadium pentoxide and water is 1:4, while stirring water While adding vanadium pentoxide, stir for 0.5h, and let stand for 3-4h to obtain a mixture of vanadium pentoxide and water.

[0027] Step 2: Potassium is added, and potassium hydroxide is put into a mixture of vanadium pentoxide and water, wherein the molar ratio of potassium to vanadium is 2.8:1, and a reaction mixture is obtained after the reaction.

[0028] Step 3, clarifying and filtering, filtering the reaction mixed solution to obtain a clarified mixed solution and a filter residue, the filter residue is press-filtered to obtain a filter cake and a filtrate, and the filtrate is refluxed into the clarified mixed solution.

[0029] Step 4, neutralization, adding sulfuric acid to the clarified mixed solution to adjust...

Embodiment 2

[0040]Example 2: A preparation method of a catalyst for sulfur dioxide oxidation to sulfuric acid, the difference from Example 1 is that step 5, mixing and grinding, taking active colloid and carrier for later use, the carrier is selected from diatomaceous earth. Take 80% of the carrier and active colloid and add them into a planetary wheel mill mixer for mixing and grinding. The amount of active colloid is 5% of the total mass of the carrier. Step 9, secondary mixing and milling; take the calcined material, add 20% carrier and active colloid, and place it in the planetary wheel mill mixer again for mixing and milling. The amount of active colloid is 8% of the total mass of the carrier.

Embodiment 3

[0041] Example 3: A preparation method of a catalyst for sulfur dioxide oxidation to sulfuric acid. The difference from Example 1 is that in step 5, mixing and milling, the active colloid and carrier are taken for later use, and the carrier is selected from diatomaceous earth. Take 80% of the carrier and active colloid and add them into a planetary wheel mill mixer for mixing and grinding. The amount of active colloid is 6% of the total mass of the carrier. Step 9, secondary mixing and milling; take the calcined material, add 20% carrier and active colloid, and put it in the planetary wheel mill mixer again for mixing and milling, the amount of active colloid is 10% of the total mass of the carrier.

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Abstract

The invention belongs to the technical field of catalysts, and discloses a preparation method of a sulfuric acid catalyst by sulfur dioxide oxidation. The preparation method comprises the steps that acarrier and active colloid containing VO3- are taken for stand-by application, 80% of the carrier and active colloid accounting for 3-6% of the total mass of the carrier are weighed, mixed and ground, the product is dried, calcined and screened, 20% of the carrier and active colloid accounting for 6-10% of the total mass of the carrier are added and subjected to secondary mixing grinding, forming, secondary drying, secondary burning, cooling and screening, and the sulfur dioxide oxidation to sulfuric acid catalyst is obtained. The preparation method has the following advantages and effects that the active colloid and the carrier are mixed, ground, dried and burned, then the active colloid is added again to be mixed, ground, dried, burned, cooled and screened, the vanadium pentoxide concentration is low on the inner layer of thesulfuric acid catalyst obtained by sulfur dioxide oxidation and high on the surface, and the catalytic activity is high.

Description

technical field [0001] The invention belongs to the technical field of catalysts, in particular to a preparation method of a catalyst for sulfur dioxide oxidation to sulfuric acid. Background technique [0002] Sulfuric acid is an important chemical raw material and occupies a very important position in national emergencies. The sulfur dioxide oxidation catalyst used in the production of sulfuric acid is mostly made of vanadium pentoxide as the active component and diatomaceous earth as the carrier. After rolling, drying, calcination and molding, the sulfur dioxide catalyst for sulfuric acid production is obtained. In the prior art, the catalyst for sulfur dioxide oxidation to sulfuric acid is usually prepared by mixing the active components with the carrier at one time, which has low catalytic activity and poor performance stability. Contents of the invention [0003] The purpose of the present invention is to provide a preparation method of sulfur dioxide oxidation sulf...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/22B01J27/055C01B17/79
Inventor 余少发
Owner XIANGYANG JINGXIN CATALYST