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Modified palladium-carbon catalyst for producing chloroacetic acid and preparation method for catalyst

A palladium carbon catalyst, catalyst technology, applied in the direction of carboxylate preparation, chemical instruments and methods, preparation of organic compounds, etc., can solve the problems that affect the effective promotion of catalysts, short catalyst life, high reaction temperature, etc., to improve the removal effect , high product quality and high selectivity

Active Publication Date: 2012-07-11
XIAN CATALYST NEW MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the supported palladium carbon catalyst has problems such as short catalyst life, long reaction time and high reaction temperature in the process of selective hydrodechlorination to prepare high-purity chloroacetic acid.
This greatly increases the cost and seriously affects the effective promotion of the catalyst

Method used

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  • Modified palladium-carbon catalyst for producing chloroacetic acid and preparation method for catalyst

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] The modified palladium carbon catalyst for the production of chloroacetic acid of the present embodiment is composed of the following components in mass percentage: 0.5% active component, 0.05% metal additive, and the balance is a carrier; the active component is metal palladium, and the The metal additive is metal barium, and the carrier is columnar activated carbon.

[0029] The preparation method of the modified palladium carbon catalyst of the present embodiment is:

[0030] Step 1, the columnar activated carbon is mixed with HNO with a mass concentration of 10% under the condition of a temperature of 70°C 3 Heat to reflux for 2h, then wash the columnar activated carbon after heating to reflux to neutrality;

[0031] Step 2. Add the washed columnar activated carbon in the step 1 into the aqueous solution of barium nitrate, place it in a boiling water bath after impregnating equal volumes at normal temperature to evaporate the moisture, then place it in an oven for ...

Embodiment 2

[0034] The modified palladium-carbon catalyst for the production of chloroacetic acid of the present embodiment is composed of the following components in mass percentage: 1.25% of the active component, 1% of the metal additive, and the balance is a carrier; the active component is metal palladium, and the The metal additive is metal barium, and the carrier is columnar activated carbon.

[0035] The preparation method of the modified palladium carbon catalyst of the present embodiment is:

[0036] Step 1, the columnar activated carbon is mixed with HNO with a mass concentration of 2% at a temperature of 100°C 3 Heating to reflux for 6h, then washing the columnar activated carbon after heating to reflux to neutrality;

[0037] Step 2. Add the washed columnar activated carbon in the step 1 into the aqueous solution of barium nitrate, place it in a boiling water bath after impregnating equal volumes at normal temperature to evaporate the moisture, then place it in an oven for dr...

Embodiment 3

[0040] The modified palladium-carbon catalyst for the production of chloroacetic acid of the present embodiment is composed of the following components in mass percentage: 0.7% of the active component, 0.1% of the metal additive, and the balance is a carrier; the active component is metal palladium, and the The metal additive is metal barium, and the carrier is columnar activated carbon.

[0041] The preparation method of the modified palladium carbon catalyst of the present embodiment is:

[0042] Step 1, the columnar activated carbon is mixed with HNO with a mass concentration of 5% under the condition of a temperature of 90°C 3 Heat to reflux for 4h, then wash the columnar activated carbon after heating to reflux to neutrality;

[0043] Step 2. Add the washed columnar activated carbon in the step 1 into the aqueous solution of barium nitrate, place it in a boiling water bath after impregnating equal volumes at normal temperature to evaporate the moisture, then place it in ...

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Abstract

The invention discloses a modified palladium-carbon catalyst for producing chloroacetic acid. The catalyst consists of the following components in percentage by mass: 0.5 to 1.25 percent of active ingredient, 0.05 to 1.0 percent of metal aid and the balance of carrier, wherein the active ingredient is metallic palladium, the metal aid is metallic barium, and the carrier is columnar active carbon.In addition, the invention also provides a preparation method for the catalyst. The preparation method for the catalyst is simple, raw materials are readily-available and good repeatability can be achieved; nano metal particles are high dispersed on the carrier; and the prepared catalyst has the advantages of high activity, high selectivity, long service life and the like. When the high-purity chloroacetic acid is prepared through selective hydrogenation and dechlorination by adopting the modified palladium-carbon catalyst, after the chloridized solution is subjected to hydrogenolysis and dehalogenation through the catalyst, the quality of the product is high, the consumption of raw materials is low, meanwhile, zero discharge of the mother solution is realized, discharge of organic halogen-containing wastes is effectively removed, and environmental protection is facilitated.

Description

technical field [0001] The invention belongs to the technical field of catalyst preparation, and in particular relates to a modified palladium carbon catalyst for chloroacetic acid production and a preparation method thereof. Background technique [0002] Chloroacetic acid is an important raw material for organic synthesis, widely used in pesticides, medicines, dyes, CMC (carboxymethyl cellulose), spices and other organic reaction intermediates. With the successive completion of domestic methanol carbonylation units, high-quality and abundant acetic acid raw materials will be provided for the production of chloroacetic acid. The easily available acetic acid can be used to produce high-purity chloroacetic acid after chlorination, and dozens of varieties can be developed. The downstream products have broad prospects for development. Domestic chloroacetic acid is mostly prepared by direct chlorination of acetic acid. Although this method has a simple process, after crystalliza...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/58C07C53/16C07C51/487C07C51/377
Inventor 卢新宁李钊曾永康王昭文张之翔
Owner XIAN CATALYST NEW MATERIALS CO LTD
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