METHOD FOR PRODUCING 2,2-METHYLENE-BIS-(4-METHYL-6-TERTBUTYLPHENOL)

摘要

1. A process for preparing 2,2-methylene-bis- (4-methyl-6-tert-butylphenol), transalkylation of mixtures comprising 2,6-di-tert-butyl-4-methylphenol and para-cresol in the presence of an acid catalyst at an elevated temperature, neutralization alkylate , separation by rectification monoalkyl-para-cresol and its condensation with formaldehyde, followed by washing the resulting product, characterized in that the condensation is carried out in the presence of a hydrocarbon solvent, and a surfactant - a catalyst, then a second portion of the hydrocarbon solvent, crystallization is carried out at low temperature, filtering, followed by washing the resulting product, a high-temperature processing of supernatant, separating the organic phase of supernatant, the regeneration therefrom of a hydrocarbon solvent, its return to the process and recycling the bottom product of the organic phase of supernatant. ! 2. A method according to claim 1, characterized in that as catalyst a transalkylation reaction using macroporous sulphocationite. ! 3. A method according to claim 1, characterized in that as surfactant-catalyst in the condensation step monoalkyl-para-cresol with formaldehyde using an alkyl benzenesulfonic acid. ! 4. A method according to claim 1, characterized in that the bottom product of the organic phase dispose of supernatant using as a raw material for antioxidant additives to automobile gasolines or stabilizer to obtain the same field of application as 2,2-methylene-bis- ( 4-methyl-6-tert-butylphenol).