- 2,4-dimethyl-6 - (1-methyl-fifteen alkyl) phenol preparation method
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The invention discloses a preparation method of 2, 4-dimethyl-6-(1-methyl-pentadecyl) phenol. The method takes 2, 4-dimethyl phenol and hexadecane as raw materials, and comprises the steps of putting the 2, 4-dimethyl phenol and the hexadecane into a reactor according to the batch charge that molar ratio of the 2, 4-dimethyl phenol to the hexadecane is equal to (1.0-1.5): 1; feeding a sulfuric acid catalyst loaded on activated carbon into the reactor, wherein the dosage of the catalyst is 5-20% of the mass of the hexadecane; under the protection of nitrogen, mixing and heating up to 100-160 DEG C, carrying out reaction for 8-30 hours, and filtering to obtain a solid catalyst; carrying out reduced pressure distillation on filtrate to obtain unreacted raw materials; after that, carrying out reduced pressure distillation at the temperature of 180-200 DEG C under 1-2mmHg to obtain the 2, 4-dimethyl-6-(1-methyl-pentadecyl) phenol. Compared with the existing synthesis method, the preparation method has the product yield reaching up to more than 88% and the content reaching up to more than 96%. The preparation method of the 2, 4-dimethyl-6-(1-methyl-pentadecyl) phenol has the advantages of being mild in reaction conditions, fewer in side reactions, reusable in catalyst, etc.
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Paragraph 0031; 0032
(2016/12/01)
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- 2,4-dimethyl-6-s-alkylphenols
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A composition containing a) a polystyrene, substituted polystyrene, copolymer or terpolymer of styrene or of a substituted styrene, polycarbonate, polyester-carbonate, polyurethane, polyamide copolyamide, polyacetyl or polyphenylene oxide and b) at least one compound of the formula I STR1 in which R1 is methyl or ethyl and R2 is C2 -C30 alkyl. Compounds of the formula I in which R2 is C8 -C30 alkyl are novel and are suitable for stabilizing organic materials against thermal, oxidative and actinic degradation.
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