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Method for purifying chloroacetic acid by catalytic hydrogenolysis in chloroacetic acid production and application thereof

A technology for catalytic hydrogenolysis and chloroacetic acid, applied in chlorine/hydrogen chloride purification, chlorine/hydrogen chloride, chemical instruments and methods, etc., can solve the problems such as whether the chlorinated solution is applicable, the catalyst activity declines rapidly, and the reaction time is long. , to reduce the deactivation trend and activity decline rate, improve the utilization rate of raw materials and product yield, and reduce hydrogen consumption.

Active Publication Date: 2011-04-06
CHINA TIANCHEN ENG +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The trichlorethylene hydrolysis method has been developed due to its relatively simple process and high product purity. Europe has used this process to build industrial production equipment, but it has been eliminated in recent years due to expensive raw materials.
[0014] Although the reaction effect of these patents has been improved, they still have the disadvantages of long reaction time, large hydrogen consumption, and rapid decline in catalyst activity, and they do not mention whether the chlorination solution containing hydrochloric acid, acetic acid and other substances is applicable.

Method used

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  • Method for purifying chloroacetic acid by catalytic hydrogenolysis in chloroacetic acid production and application thereof

Examples

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Effect test

Embodiment 1

[0038] Example 1. A method for purifying monochloroacetic acid by catalytic hydrogenolysis in the production of monochloroacetic acid. It includes treating the mother liquor after acetic acid chlorination under certain temperature and pressure. The following steps are also included: (1) in a catalytic reactor lined with polytetrafluoroethylene or zirconium material, one or a combination of Group VIII noble metals is installed as a hydrogenolysis catalyst bed, and the ratio of noble metals to the carrier is 3.5% (2) under the gauge pressure of 500kPa and the temperature condition of 150 DEG C, the chlorinated liquid in the monochloroacetic acid production process is made to flow through the fixed bed layer, and the hydrogen-nitrogen mixed gas and the liquid phase are co-flowed into the bed layer; (3) Under the action of the catalyst bed, make all or most of the polychloroacetic acid in the chlorinated liquid hydrogenolyze to produce monochloroacetic acid; (4) take the material...

Embodiment 2

[0039] Example 2. A method for purifying monochloroacetic acid by catalytic hydrogenolysis in the production of monochloroacetic acid. It includes treating the mother liquor after acetic acid chlorination under certain temperature and pressure. The following steps are also included: (1) in a catalytic reactor lined with polytetrafluoroethylene or zirconium material, one or a combination of Group VIII noble metals is installed as a hydrogenolysis catalyst bed, and the ratio of noble metals to the carrier is 2% (2) under the gauge pressure of 800kPa and the temperature condition of 100 DEG C, make the chlorinated liquid in the monochloroacetic acid production process flow through the fixed bed layer, and simultaneously make the hydrogen-nitrogen mixed gas and the liquid phase co-flow into the bed layer; (3) Under the action of the catalyst bed, make all or most of the polychloroacetic acid in the chlorinated liquid hydrogenolyze to produce monochloroacetic acid; (4) take the ma...

Embodiment 3

[0040] Example 3. A method for purifying monochloroacetic acid by catalytic hydrogenolysis in the production of monochloroacetic acid. It includes treating the mother liquor after acetic acid chlorination under certain temperature and pressure. It also includes the following steps: (1) in a catalytic reactor lined with polytetrafluoroethylene or zirconium material, one or a combination of Group VIII noble metals is installed as a hydrogenolysis catalyst bed, and the ratio of noble metals to the carrier is 0.1% (2) under the gauge pressure of 100kPa and the temperature condition of 200 DEG C, the chlorinated liquid in the monochloroacetic acid production process is made to flow through the fixed bed layer, and the hydrogen-nitrogen mixed gas and the liquid phase are co-flowed into the bed layer; (3) Under the action of the catalyst bed, make all or most of the polychloroacetic acid in the chlorinated liquid hydrogenolyze to produce monochloroacetic acid; (4) take the material ...

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Abstract

The invention discloses a method for purifying chloroacetic acid by catalytic hydrogenolysis in chloroacetic acid production and application thereof. The method comprises the following steps of: arranging a VIII-group metal serving as a hydrogenolysis catalyst bed layer in a catalytic reactor with a lining made from polytetrafluoroethylene or a zirconium material; making the solution of chloride flow through a fixed bed layer and making a hydrogen-nitrogen mixed gas and a liquid phase flow in parallel to enter the bed layer at the gage pressure of 100 to 800 kPa and the temperature of 100 and 200 DEG C; performing hydrogenolysis on all or most of polychlorinated acid in the solution of the chloride; taking a material out of the reactor; performing gas-liquid separation; crystallizing the liquid phase of the solution of the chloride; washing to obtain a chloroacetic acid product; and condensing, absorbing and separating a gas phase for recovering hydrogen, chlorine hydride and acetic acid. The method can improve the removal effect and the treatment efficiency of dichloroacetic acid and trichloroacetic acid and product purity, reduce the deactivation trend and the activity descent speed of a catalyst, shorten reaction time, reduce hydrogen consumption, improve raw material utilization rate and product yield, and further improve economic benefits.

Description

technical field [0001] The invention belongs to the technical field of monochloroacetic acid production technology, and more specifically relates to the improvement and innovation of the method for purifying monochloroacetic acid by catalytic hydrogenolysis in the production of monochloroacetic acid and its application. Background technique [0002] Chloroacetic acid is an important organic fine chemical raw material, widely used in pesticides, medicines, dyes, oilfield chemicals, paper chemicals, textile auxiliaries, surfactants, electroplating, spices, flavors and other fields. Its largest use is the production of carboxymethyl cellulose, followed by the production of thioglycolic acid. With the advancement and development of technology, new application fields of chloroacetic acid have been gradually developed, and the prospect is very broad. In recent years, the world's total consumption of chloroacetic acid has exceeded 800,000 t / a, and China's consumption has also exce...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C53/16C07C51/487C01B3/50C01B7/07C07C53/08C07C51/42
Inventor 丁军委王传兴袁学民武玉民任君许军王国亮
Owner CHINA TIANCHEN ENG
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