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Method for catalytic hydrogenation dehalogenation of halogenated phenols

A halogenated phenol and catalytic hydrogenation technology, applied in the field of halogenated phenol compound catalytic hydrodehalogenation, can solve problems such as low conversion rate, and achieve the effects of easy control of operation, mild reaction conditions and simple preparation

Inactive Publication Date: 2006-09-13
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For example, U.S. Patent (1971, US3,579,596) uses noble metal catalysts, by CCl 4 Selective hydrodechlorination to produce CH 2 Cl 2 and CHCl 3 ; U.S. Patent (1995, US5,453,557) uses Pt-Cu bimetallic catalyst to produce propylene for hydrogenation of 1,2-dichloropropane; U.S. Patent (1986, US4,618,686) uses Pd / C as catalyst, and then adds phosphate , can dechlorinate polychlorinated biphenyls; U.S. Patent (1971, US3,595,931) uses Pd / Al 2 o 3 As a catalyst, in the presence of KOH, the gas phase reaction of catalytic hydrodechlorination of 2-chloro-p-xylene and hydrogen at high temperature produces xylene, the conversion rate is close to 100%, and the conversion rate is low at low temperature

Method used

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  • Method for catalytic hydrogenation dehalogenation of halogenated phenols
  • Method for catalytic hydrogenation dehalogenation of halogenated phenols
  • Method for catalytic hydrogenation dehalogenation of halogenated phenols

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0018] Example 1, the preparation of catalyst

[0019] Dissolve a certain amount of palladium chloride in concentrated hydrochloric acid, dilute it with water, impregnate it into activated carbon, and evaporate to dryness under constant stirring. The obtained solid is ground into powder, reduced by hydrogen, and then sealed and stored to obtain palladium / carbon catalysts with different contents. Palladium / carbon catalysts with different contents are listed in Table 1

example 2

[0020] Example 2, according to the preparation process of the catalyst described in Example 1, except that the active component and the carrier are different, all the other processes are the same, and the supported catalysts of different carriers and different active components are prepared, and the prepared catalyst is listed in Table 1.

example 3

[0021] The preparation of example 3, Raney Ni

[0022] Dissolve a certain amount of NaOH in water, put it into a beaker and cool it with ice. Add a certain amount of powdered Ni-Al alloy, and add in small amounts under constant stirring until the addition is complete. Heat at 115-120°C for 4 hours, then add 440 ml of NaOH solution, keep it for a while until there is no more H 2 Generated, add water after cooling. Use the pouring method to remove the supernatant, add water and stir, and then remove the supernatant after precipitation, and then wash the catalyst repeatedly until the washing liquid is neutral to the stone reagent, then wash it with 95% ethanol for 5 times, and store it. in ethanol covered with a glass stopper.

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Abstract

A process for catalytic hydrodehalogenation of halophenol compound features that alkali is added to liquid-phases system, and the H2 and carried catalyst whose active component is the metal in VIII family are used for the hydrodehalagenating reaction at 20-120 deg.C under 0.05-1.0 MPa.

Description

technical field [0001] The invention relates to a method for catalytic hydrogenation dehalogenation of halogenated phenol compounds, specifically, in a liquid phase system, Pd, Rh, Pt, Ni, Co, Cu and other Group VIII metals are used as active components Under the action of a catalyst, hydrogen is used as a reducing agent to catalyze the hydrodehalogenation of halogenated phenol compounds. Background technique [0002] Halogenated phenolic compounds, especially chlorinated phenolic compounds, are industrially produced in large quantities as intermediates for the synthesis of organochlorine pesticides, and are also widely used as insecticides and fungicides. Such compounds are difficult to degrade in nature , easy to accumulate in organisms, and has the "three effects" of carcinogenicity, teratogenicity, and mutagenicity. The emission and diffusion of halogenated phenolic compounds in the environment can cause serious pollution to the environment and cause great harm to human...

Claims

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Application Information

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IPC IPC(8): C07C35/12C07C29/58A62D3/00
Inventor 徐杰夏传海梁鑫淼孙志强张伟
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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