Modified hydrodechlorination catalyst for producing high-purity chloroacetic acid and preparation method thereof

A hydrodechlorination and catalyst technology, which is applied in the preparation of carboxylate, chemical instruments and methods, metal/metal oxide/metal hydroxide catalysts, etc., can solve the problems of strict preparation conditions and operation, and achieve good selectivity. , stable performance, and the effect of improving efficiency

Active Publication Date: 2022-02-18
QINGDAO UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the palladium element in it works through the complex, and the preparation conditions are strictly operated

Method used

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  • Modified hydrodechlorination catalyst for producing high-purity chloroacetic acid and preparation method thereof
  • Modified hydrodechlorination catalyst for producing high-purity chloroacetic acid and preparation method thereof
  • Modified hydrodechlorination catalyst for producing high-purity chloroacetic acid and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0080] This embodiment prepares a modified hydrodechlorination catalyst for high-purity chloroacetic acid, which is composed of the following components: the metal active component elemental palladium accounts for 0.5% of the overall mass percentage of the catalyst, and the metal additive elemental zirconium accounts for 2.0% of the overall mass percentage of the catalyst. , and the balance is activated carbon carrier.

[0081] The preparation method of the modified hydrodechlorination catalyst of the present embodiment is:

[0082] Step 1: Weigh the activated carbon carrier and pour it into nitric acid solution as the pickling solution for pickling. The concentration of the pickling solution is 1.0mol / L, heat in a water bath at 80°C for 4 hours, and then wash with deionized water until the solution is neutral , dried at 120°C for 5 hours;

[0083] Step 2: Add the activated carbon carrier initially treated in step 1 into the zirconium salt solution, where the concentration of...

Embodiment 6

[0089] This embodiment prepares a modified hydrodechlorination catalyst for high-purity chloroacetic acid, which is composed of the following components: the metal active component elemental palladium accounts for 1.0% of the overall mass percentage of the catalyst, and the metal additive elemental zirconium accounts for 1.5% of the overall mass percentage of the catalyst. , and the balance is activated carbon carrier.

[0090] The preparation method of the modified hydrodechlorination catalyst of the present embodiment is:

[0091] Step 1: Weigh the activated carbon carrier and pour it into nitric acid solution as the pickling solution for pickling. The concentration of the pickling solution is 1.0mol / L, heat in a water bath at 80°C for 4 hours, and then wash with deionized water until the solution is neutral , dried at 120°C for 5 hours;

[0092] Step 2: Add the activated carbon carrier initially treated in step 1 into the zirconium salt solution, where the concentration of...

Embodiment 11

[0098] This embodiment prepares a modified hydrodechlorination catalyst for high-purity chloroacetic acid, which consists of the following components: the metal active component elemental palladium accounts for 1.0% of the overall mass percentage of the catalyst, and the metal promoter zirconium accounts for 2.0% of the overall mass percentage of the catalyst. The balance is activated carbon carrier.

[0099] The preparation method of the modified hydrodechlorination catalyst of the present embodiment is:

[0100] Step 1: Weigh the activated carbon carrier and pour it into nitric acid solution as the pickling solution for pickling. The concentration of the pickling solution is 0.5mol / L, heat in a water bath at 80°C for 4 hours, and then wash with deionized water until the solution is neutral , dried at 120°C for 5 hours;

[0101] Step 2: Add the activated carbon carrier initially treated in step 1 into the zirconium salt solution, where the concentration of the zirconium salt...

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Abstract

The invention discloses a method for preparing a modified hydrodechlorination catalyst and producing high-purity chloroacetic acid. The catalyst is composed of the following components: the metal active component accounts for 0.5-2.0% by mass of the catalyst as a whole, the metal auxiliary agent accounts for 1.0-4.0% by mass of the catalyst as a whole, and the balance is a carrier. The elemental substance is selected from one or more of palladium, platinum and nickel. The metal additive element is selected from one or more of rhenium, zirconium, ruthenium, cadmium, barium, and vanadium, and the carrier is selected from one or more of activated carbon, alumina, titanium dioxide, and aluminum fluoride. This catalyst has the characteristics of high hydrogenation reduction, good selectivity, stable performance, small feed ratio when used, reusable and easy to recycle. The prepared catalyst can hydrodechlorinate dichloroacetic acid, trichloroacetic acid or the mixture thereof to obtain high-purity chloroacetic acid, and realize zero discharge of mother liquor.

Description

technical field [0001] The invention belongs to the field of catalyst preparation, and in particular relates to a modified hydrodechlorination catalyst and its preparation method and application. The application specifically includes a method for producing high-purity chloroacetic acid with the modified palladium-carbon catalyst. . Background technique [0002] Chloroacetic acid is an intermediate in dyes, pesticides, medicines, resins and other organic synthesis. Chloroacetic acid has a wide range of uses. It can be used in the dye industry to produce indigo dye; in the pharmaceutical industry, it can be used to synthesize caffeine, barbiturates, epinephrine, vitamin B6, aminoacetic acid, etc.; in the pesticide industry, it can be used to manufacture dimethoate, herbicides, 2 , 4-D-butyl ester, 2,4,5-T, thiocyanoacetic acid, naphthaleneacetic acid, etc.; used in the pharmaceutical industry to synthesize caffeine, barbiturates, epinephrine, vitamin B6, aminoacetic acid, mal...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/42B01J35/10C07C51/377C07C53/16
CPCC07C51/377B01J23/42B01J35/1023B01J35/1061
Inventor 项曙光孙晓岩夏力滕俊峰王一鑫
Owner QINGDAO UNIV OF SCI & TECH
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