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
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[0025] Specific embodiment 1: This embodiment is a preparation method of 2,4-dicumylphenol, which is realized by the following steps:
[0026] 1. Under the protection of nitrogen, add phenol and homogeneous composite catalyst into the reactor, then heat to 50-60°C, then remove the heating source to stop heating, and then add α-methylstyrene dropwise to the reactor. Control the dropping rate of α-methyl styrene so that the reaction temperature is between 90 and 100°C. After the α-methyl styrene is added dropwise, the reaction is continued at 90 to 100°C for 20 to 40 minutes. 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 mass of the homogeneous composite catalyst is phenol. 1% to 4% of the mass, the molar ratio of α-methylstyrene to phenol is 2 to 2.3:1;
[0027] 2. Add anhydrous sodium acetate to ...
Example Embodiment
[0033] Specific embodiment two: this embodiment is different from specific embodiment one in that the quaternary ammonium salt in step one is tetraethylammonium bromide, tetrabutylammonium bromide, tetraheptylammonium bromide, tetraoctylammonium bromide , Hexadecyl 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 in the first embodiment.
Example Embodiment
[0034] Specific embodiment three: This embodiment is different from specific embodiment one or two in that in step one, 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 the first or second embodiment.
[0035] In this embodiment, by controlling the dropping rate and using the heat released by the reaction itself, the system can be maintained at 90-95°C.
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