Preparation method of 4-tertoctyl-2,6-dicumylphenol
A technology of tertoctylphenol and cumylphenol, applied in the field of preparation of 4-tertoctyl-2,6-dicumylphenol, which can solve the problems of disproportionation and poor reaction selectivity
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specific Embodiment approach 1
[0024] Specific embodiment 1: The preparation method of 4-tertoctyl-2,6-dicumylphenol in this embodiment is carried out according to the following steps:
[0025] 1. Preparation of composite catalyst: Add 4-tetraoctylphenol, metal aluminum and rare earth chloride into the reactor, and under the protection of nitrogen, heat the reaction system to 110-140°C for reaction, until no more bubbles are released. Keep warm for 0.4-0.6h, then add ionic liquid, mix evenly to get the mixture of 4-tertoctylphenol and composite catalyst;
[0026] 2. Alkylation reaction: Add α-methylstyrene dropwise to the mixture of 4-tertoctylphenol and composite catalyst, control the rate of addition to keep the system temperature at 100-180°C, wait for α-methylstyrene to drop After the addition was completed, the reaction was continued for 0.8 to 1.2 hours to obtain a reaction mixture;
[0027] 3. Product refining: add dilute sulfuric acid with a mass concentration of 10% to 30% to the reaction mixture ...
specific Embodiment approach 2
[0029] Specific embodiment two: the difference between this embodiment and specific embodiment one is: the composite catalyst in the mixture of 4-tertoctylphenol and composite catalyst obtained in step one is 4-tertoctylphenol aluminum, ionic liquid and chlorinated Rare earth composite catalyst. Others are the same as in the first embodiment.
specific Embodiment approach 3
[0030] Specific embodiment three: the difference between this embodiment and specific embodiment one or two is: in step one, the ionic liquid is tetrafluoroborate or p-toluenesulfonate of alkylimidazole, and its general formula is:
[0031]
[0032] R=C 2 h 5 , n-C 4 h 9
[0033]
[0034] Others are the same as in the first or second embodiment.
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