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

A technology of dihydroxybenzophenone and aluminum trichloride, applied in the direction of condensation preparation of carbonyl compounds, organic chemistry, etc., can solve the problems of industrial waste pollution, low product yield, complex decolorization and purification process, etc., and achieve easy Separation and purification, good color effect

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

[0016] Prepare 2,4-dihydroxybenzophenone as follows:

[0017] (a) Weigh resorcinol, benzoyl chloride, aluminum trichloride and chlorobenzene in a ratio of 1:1:2:2;

[0018] (b) Put the raw materials weighed in step (a) into the reaction container at the same time, heat and stir until each component is fully dissolved, and react at 50-70°C for 5-6 hours;

[0019] (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.

[0020] The product yield of gained 2,4-dihydroxybenzophenone is 60%.

specific Embodiment 2

[0021] Prepare 2,4-dihydroxybenzophenone as follows:

[0022] (a) Weigh resorcinol, benzoyl chloride, aluminum trichloride and chlorobenzene in a substance ratio of 1:2:2:4;

[0023] (b) Put the raw materials weighed in step (a) into the reaction container at the same time, heat and stir until each component is fully dissolved, and react at 50-70°C for 5-6 hours;

[0024] (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.

[0025] The product yield of gained 2,4-dihydroxybenzophenone is 70%.

specific Embodiment 3

[0026] Prepare 2,4-dihydroxybenzophenone as follows:

[0027] (a) Weigh resorcinol, benzoyl chloride, aluminum trichloride and chlorobenzene in a substance ratio of 1:2:2:4;

[0028] (b) Put in benzoyl chloride, aluminum trichloride and chlorobenzene and heat and stir until they are fully dissolved, then slowly add resorcinol dropwise while heating and stirring to react, and react at 50-70°C for 3-4 hours;

[0029] (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.

[0030] The product yield of gained 2,4-dihydroxybenzophenone is 75%.

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PUM

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Abstract

The invention discloses a method for preparing 2, 4-dihydroxy benaophenonel by using aluminum trichloride to catalyze. The method comprises the following steps of firstly, weighing resorcin, benzoyl chloride and aluminum trichloride in a mass ratio of 1:(1-2):(1-2), and a proper amount of solvent; then, feeding the weighed raw materials into a reaction container, heating and stirring until each component is fully dissolved, and reacting for 3 to 6 hours at the temperature of 50 to 70 DEG C; and after reacting, pouring the reaction liquid into 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 aluminum trichloride to catalyze has the advantages that the aluminum 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; and the luster of a reaction product of the 2, 4-dihydroxy benaophenonel is good, the separation and the purification are easy, and the yield rate can reach more than 70%.

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 aluminum 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, thereby prolonging the service life of plastic products, coatings and other building materials, improving their performance stability, and expanding 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 defic...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C49/83C07C45/46
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