Preparation of 2,6-di-tert-butyl-4-alkylphenols
AssigneeUop LLC
InventorPaul R. Kurek
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Abstract
Alkylation of 4-alkylphenols with 2-methylpropene in the presence of a macroreticular cation exchange resin bearing sulfonic acid groups with an internal surface area greater than about 200 m.sup.2 /g and an average pore diameter less than about 120 Angstroms leads to the 2,6-dialkylated product in high yields. Using a resin with an internal surface area of from about 525 to about 575 m.sup.2 /g and an average pore diameter from about 40 to about 60 Angstroms, there can be prepared from 4-methylphenol the antioxidant 2,6-di-tert-butyl-4-methylphenol in a yield in excess of 90%.
Claims7
A method of preparing a 2,6-di-tert-butyl-4-alkylphenol comprising reacting a 4-alkylphenol with from about 3 to about 10 molar proportions of 2-methylpropene at a temperature from about 50.degree. to about 125.degree. C. in the presence of a macroreticular cation exchange resin bearing sulfonic acid groups, said resin having an internal surface area from about 200 to about 600 m.sup.2 /g with an average pore diameter from about 30 to about 120 Angstroms, and recovering the 2,6-di-tert-butyl-4-alkylphenol produced thereby.
Dependencies are inferred from the claim text.