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Continuous preparation method and system of dibenzoyl methane

A technology of dibenzoylmethane and methyl benzoate, which is applied in the field of continuous preparation method and system of dibenzoylmethane, can solve the problems of low technical yield, large consumption of raw materials, high production cost, etc., and shorten the reaction time Time, reaction process, environmental protection, and the effect of improving yield

Pending Publication Date: 2021-11-09
ANHUI JIAXIAN FUNCTIONAL AUXILIARY
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Problems solved by technology

[0004] The purpose of the present invention is to provide a continuous preparation method and system of dibenzoylmethane, to overcome the problems of low yield, large consumption of raw materials and high production cost of dibenzoylmethane industrial synthesis technology

Method used

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  • Continuous preparation method and system of dibenzoyl methane

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Embodiment 1

[0025] Using benzoic acid and methanol as raw materials, the ratio of the amount of benzoic acid to methanol is 1:4, and the esterification reaction is carried out under the catalysis of the composite catalyst p-toluenesulfonic acid and concentrated sulfuric acid at 110 °C for 5 hours. After the reaction, Rectification obtains methyl benzoate; wherein the quality of p-toluenesulfonic acid is 5% of the concentrated sulfuric acid quality, and the addition of composite catalyst is 2% of the total mass of benzoic acid and methanol.

[0026] Then, methyl benzoate is directly mixed with the xylene solution containing acetophenone and sodium methylate, wherein the ratio of the amount of methyl benzoate to acetophenone is 3:1, and the acetophenone in the xylene solution The concentration of sodium methoxide and sodium methoxide is 53wt% and 1.6wt%. After mixing, Claisen condensation reaction is carried out. The reaction goes through three gradient temperature reactions of 8°C, 130°C, a...

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Abstract

The invention discloses a continuous preparation method and system of dibenzoyl methane. The preparation method comprises the following steps of: carrying out an esterification reaction on benzoic acid and methanol as raw materials for 3-6 hours under the catalytic action of a composite catalyst at the temperature of 100-110 DEG C, and after the reaction is finished, rectifying to obtain methyl benzoate; and directly mixing the methyl benzoate with a xylene solution containing acetophenone and sodium methoxide, carrying out Claisen condensation reaction, and after the reaction is finished, crystallizing and filtering to obtain dibenzoyl methane. According to the method, the defects in the prior art are overcome, continuous production is guaranteed, the reaction speed is increased, the reaction time is shortened, and the yield of dibenzoyl methane is increased.

Description

technical field [0001] The invention relates to the technical field of dibenzoylmethane production, in particular to a continuous preparation method and system of dibenzoylmethane. Background technique [0002] my country is a large PVC production, processing and consumption country. With the improvement of environmental protection laws and regulations and attention to product quality and safety, the growth rate of the consumption market of environmentally friendly PVC heat stabilizer dibenzoylmethane will remain at 10% and above. At present, lead salt stabilizers are mainly used in the domestic market, but with the implementation of my country's new environmental protection law and the gradual enhancement of people's environmental awareness, the use of lead salt heat stabilizers will be greatly limited in the future. At the same time, with the revision of national environmental protection laws and the continuous enhancement of people's awareness of environmental protection, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C49/784C07C45/45C07C69/78C07C67/08B01J31/02B01D3/14B01D3/32B01J8/00B01J19/00B01J19/24
CPCC07C45/455C07C67/08B01J31/0225B01J8/00B01D3/14B01D3/32B01J19/245B01J19/0013B01J27/02B01J2231/49B01J35/19C07C49/784C07C69/78Y02P20/584
Inventor 李兑童庆军李平张国靓王艳
Owner ANHUI JIAXIAN FUNCTIONAL AUXILIARY
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