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Preparation method of 2,4-dicumyl phenol

A technology of cumylphenol and phenol, which is applied in the preparation of organic compounds, chemical instruments and methods, and the production of bulk chemicals, can solve the problems of difficult operation of organic phenols, poor selectivity, waste water, etc., to increase the reaction rate and promote Dissolving speed, energy saving effect

Inactive Publication Date: 2012-02-01
襄阳市裕昌精细化工有限公司
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Problems solved by technology

[0006] The purpose of the invention is to solve the problem that the selectivity of 2,4-dicumylphenol is poor in the existing 2,4-dicumylphenol preparation method, the catalyst removal process is difficult to operate and a large amount of organic phenol-containing wastewater is produced. The invention provides a preparation method of 2,4-dicumylphenol

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  • Preparation method of 2,4-dicumyl phenol
  • Preparation method of 2,4-dicumyl phenol

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specific Embodiment approach 1

[0025] Specific embodiment one: this embodiment is the preparation method of 2,4-dicumylphenol, which is realized through the following steps:

[0026] 1. Under nitrogen protection, add phenol and homogeneous composite catalyst into the reactor, then heat up to 50-60°C, then remove the heating source to stop heating, then add α-methylstyrene dropwise into the reactor, Control the rate of addition of α-methylstyrene so that the reaction temperature is between 90 and 100°C. After the dropwise addition of α-methylstyrene is completed, the reaction is then continued for 20 to 40 minutes at a temperature of 90 to 100°C, wherein , the homogeneous composite catalyst is a mixture of quaternary ammonium salt and p-toluenesulfonic acid, the mass ratio of quaternary ammonium salt and p-toluenesulfonic acid in the homogeneous composite catalyst is 0.2~0.4:1, and the quality of the homogeneous composite catalyst is phenol 1% to 4% of the mass, the molar ratio of α-methylstyrene to phenol i...

specific Embodiment approach 2

[0033] Specific embodiment two: the difference between this embodiment and specific embodiment one is that the quaternary ammonium salt in step one is tetraethyl ammonium bromide, tetrabutyl ammonium bromide, tetraheptyl ammonium bromide, tetraoctyl ammonium bromide , tetrahexadecyl ammonium bromide, benzyl trimethyl ammonium bromide, tetraethyl ammonium chloride, tetrabutyl ammonium chloride, tetraheptyl ammonium chloride, tetraoctyl ammonium chloride, forty six Alkyl ammonium chloride or benzyl trimethyl ammonium chloride. Other steps and parameters are the same as those in Embodiment 1.

specific Embodiment approach 3

[0034] Embodiment 3: The difference between this embodiment and Embodiment 1 or 2 is that in step 1, the dropping rate of α-methylstyrene is controlled so that the reaction temperature is between 90°C and 95°C. Other steps and parameters are the same as those in Embodiment 1 or Embodiment 2.

[0035] In this embodiment, the temperature of the system can be maintained at 90-95° C. by controlling the rate of addition and using the heat released by the reaction itself.

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Abstract

The invention provides a preparation method of 2,4-dicumyl phenol, solving the problem that in the existing 2,4-dicumyl phenol preparation method, the selectivity of 2,4-dicumyl phenol is poor, the catalyst removal process is difficult to operate and a large amount of wastewater containing phenol is generated. The preparation method comprises the following steps: firstly, mixing phenol with a homogeneous composite catalyst and heating, and then dropwise adding alpha-methyl styrene; after stirring and reacting, adding anhydrous sodium acetate to further stir and react; and finally, carrying out reduced pressure distillation. According to the invention, the homogeneous composite catalyst of quaternary ammonium salt and p-toluenesulfonic acid is used, thus the selectivity of 2,4-dicumyl phenol is improved by 85-90%, and the conversion rate of alpha-methyl styrene and phenol reaches 100%; in the reaction process, no external source is not needed for heating, heat released in the reaction process is just utilized, thereby effectively saving energy; and reduced pressure distillation is adopted, thereby avoiding composite separation processes such as filtration, alkaline water washing, organic solvent extraction and the like and obviously shortening reaction time.

Description

technical field [0001] The invention relates to a preparation method of 2,4-dicumylphenol. Background technique [0002] 2,4-dicumylphenol is an important fine chemical raw material, which can be used in the production of fine chemicals such as ultraviolet absorbers (especially suitable for polycarbonate products), surfactants, agricultural emulsifiers, and fungicides. With the continuous development of the above products, especially the continuous expansion of the output of polycarbonate products, the demand for 2,4-dicumylphenol continues to increase. At present, the demand in the world market is about 10,000 tons per year, and the domestic demand is about 1,000 tons per year. [0003] The production of 2,4-dicumylphenol is generally obtained by the alkylation reaction of phenol and α-methylstyrene in the presence of an acidic catalyst. The industrial production of this product began in the late 1980s abroad, and the domestic research work began in the late 1990s. Howeve...

Claims

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Application Information

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IPC IPC(8): C07C39/06C07C37/11
CPCY02P20/52
Inventor 由君刘波宋永彬秦伟艳
Owner 襄阳市裕昌精细化工有限公司
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