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Method for preparing 2, 4-dihydroxy benaophenonel by using indium trichloride to catalyze

A technology of dihydroxybenzophenone and indium trichloride is applied in the field of catalyzing the preparation of 2,4-dihydroxybenzophenone by indium trichloride, which can solve industrial waste pollution, high production energy consumption and product yield. problems such as low rate, to achieve the effect of easy separation and purification, and damage reduction

Inactive Publication Date: 2013-05-01
芜湖市联合涂料有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There are many industrial synthesis methods for 2,4-dihydroxybenzophenone, but the existing processes more or less have high production energy consumption, low product yield, complex decolorization and purification process, and industrial waste pollution. Serious deficiencies in other aspects, so the development and research of new synthesis techniques for 2,4-dihydroxybenzophenone has been uninterrupted

Method used

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Examples

Experimental program
Comparison scheme
Effect test

specific Embodiment 1

[0017] Prepare 2,4-dihydroxybenzophenone as follows:

[0018] (a) Put resorcinol, benzoic acid, indium trichloride, and water into the reaction vessel in a ratio of 10:10:1:100;

[0019] (b) Heat to 105-110°C, stir until the components in step (a) are fully dissolved, and reflux for 3-5 hours;

[0020] (c) After the reaction is completed, pour the reaction solution in step (b) into cold water, crystallize, filter, and dry to obtain 2,4-dihydroxybenzophenone.

[0021] The product yield of gained 2,4-dihydroxybenzophenone is 80%.

specific Embodiment 2

[0022] Prepare 2,4-dihydroxybenzophenone as follows:

[0023] (a) Put resorcinol, benzoic acid, indium trichloride, and water into the reaction vessel in a ratio of 10:20:3:150;

[0024] (b) Heat to 105-110°C, stir until the components in step (a) are fully dissolved, and reflux for 3-5 hours;

[0025] (c) After the reaction is completed, pour the reaction solution in step (b) into cold water, crystallize, filter, and dry to obtain 2,4-dihydroxybenzophenone.

[0026] The product yield of gained 2,4-dihydroxybenzophenone is 85%.

specific Embodiment 3

[0027] Prepare 2,4-dihydroxybenzophenone as follows:

[0028] (a) Put resorcinol, benzoic acid, indium trichloride, and n-hexane into the reaction vessel at a ratio of 10:20:3:150;

[0029] (b) Heat to 70-75°C, stir until the components in step (a) are fully dissolved, and reflux for 6-8 hours;

[0030] (c) After the reaction is completed, pour the reaction solution in step (b) into cold water, crystallize, filter, and dry to obtain 2,4-dihydroxybenzophenone.

[0031] The product yield of gained 2,4-dihydroxybenzophenone is 70%. This shows that the reaction time required for normal hexane as a solvent is longer, and the product yield is not as high as water as a solvent.

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Abstract

The invention discloses a method for preparing 2, 4-dihydroxy benaophenonel by using indium trichloride to catalyze. The method comprises the following steps of adding resorcin, benzoyl chloride, indium trichloride and solvent into a reaction container, heating, stirring, and carrying out reflux reaction for 3 to 8 hours; and after reacting, pouring the reaction liquid into a large amount of cold water, crystallizing, filtering, and drying, so as to obtain the 2, 4-dihydroxy benaophenonel. The method for preparing the 2, 4-dihydroxy benaophenonel by using the indium trichloride to catalyze has the advantages that the indium trichloride is used as a catalyst, and the reaction can be carried out under the reaction condition with lower requirement, so the 2, 4-dihydroxy benaophenonel is prepared; the separation and the purification of the reaction product are easy, and the yield rate can reach more than 80%; and pollution-free water is adopted as the solvent, so the injury of the solvent to environments and experiment persons is avoided.

Description

technical field [0001] The invention relates to the technical field of chemical raw material synthesis, in particular to a method for preparing 2,4-dihydroxybenzophenone by catalyzing indium trichloride. technical background [0002] 2,4-Dihydroxybenzophenone is a light stabilizer with excellent performance. It can be added to materials such as plastics and coatings that have been exposed to sunlight for a long time and are prone to aging under long-term light conditions to play a role in absorbing ultraviolet rays. function, so as to prolong the service life of plastic products, coatings and other building materials, improve their performance stability, and expand their application fields and scope. There are many industrial synthesis methods for 2,4-dihydroxybenzophenone, but the existing processes more or less have high production energy consumption, low product yield, complex decolorization and purification process, and industrial waste pollution. Serious deficiencies i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C49/83C07C45/45
Inventor 吴为亚张凯张辉孙家文仇军
Owner 芜湖市联合涂料有限责任公司
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