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

A technology of hydrodechlorination and catalyst, which is applied in the direction of carboxylate preparation, chemical instruments and methods, metal/metal oxide/metal hydroxide catalyst, etc., and can solve the problems of strict preparation conditions and operations

Active Publication Date: 2017-12-01
QINGDAO UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the palladium element in it works through the com

Method used

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

Examples

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Example Embodiment

[0079] Example 1

[0080] The modified hydrodechlorination catalyst of high purity chloroacetic acid prepared in this embodiment is composed of the following components: the metal active component elemental palladium accounts for 0.5% of the total mass of the catalyst, and the metal promoter elemental zirconium accounts for 2.0% of the total mass of the catalyst. , The balance is activated carbon carrier.

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

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

[0083] Step 2: Add the activated carbon carrier preliminarily treated in step 1 to the zirconium salt solution, where the concentration of the zirconium salt solution is 0.0...

Example Embodiment

[0088] Example 6

[0089] In this embodiment, a modified hydrodechlorination catalyst of high-purity chloroacetic acid is prepared, which is composed of the following components: elemental palladium as a metal active component accounts for 1.0% of the total mass of the catalyst, and elemental zirconium as a metal promoter accounts for 1.5% of the total mass of the catalyst. , The balance is activated carbon carrier.

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

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

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

Example Embodiment

[0097] Example 11

[0098] The modified hydrodechlorination catalyst for preparing high-purity chloroacetic acid in this embodiment is composed of the following components: the metal active component elemental palladium accounts for 1.0% of the total mass of the catalyst, and the metal promoter zirconium accounts for 2.0% of the total mass of the catalyst. The balance is activated carbon carrier.

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

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

[0101] Step 2: Add the activated carbon carrier preliminarily treated in step 1 to the zirconium salt solution, where the concentration of the zirconium salt solution is 0.06 mol / ...

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Abstract

The invention discloses preparation of a modified hydrodechlorination catalyst and a method for producing high-purity chloroacetic acid. The modified hydrodechlorination catalyst comprises the following ingredients by mass percent: 0.5-2.0% of a metal active component elementary substance, 1.0-4.0% of a metal additive elementary substance and the balance of a carrier, wherein the metal active component elementary substance is selected from one or more of palladium, platinum and nickel; the metal additive elementary substance 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, aluminium oxide, titanium dioxide and aluminum fluoride. The catalyst has the characteristics of high hydrogenation reduction performance, good selectivity, stable performance, small charge rate during use, reusability, easy recycling and the like. According to the prepared catalyst, hydrodechlorination can be performed on dichloroacetic acid and trichloroacetic acid or a mixed liquid of the two to obtain high-purity chloroacetic acid, and zero mother liquor discharge is realized.

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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IPC IPC(8): B01J23/42B01J35/10C07C51/377C07C53/16
CPCC07C51/377B01J23/42B01J35/1023B01J35/1061C07C53/16
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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