Preparation of 2,4,6-trialkylphenols
AssigneeUop LLC
InventorBruce E. Firth
Life of this patent
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Abstract
Substantially improved yields of 2,4,6-trialkylphenols result from alkylating a mixture of phenol and 2,6-dialkylphenol, the latter being a by-product of the alkylation reaction. This results flows from an unexpected synergistic effect accompanying transalkylation. The continuous method of making 2,4,6-trialkylphenol based on this property affords the highly desirable trialkylated phenols in high yield.
Claims22
A method of making a 2,4,6-trialkylphenol comprising reacting a feed mixture of a 2,6-dialkylphenol and phenol with an olefin over a bed of solid catalyst selected from the group consisting of alumina, fluorided alumina, chlorided alumina, and silica-alumina under alkylating conditions, separating the unreacted 2,6-dialkylphenol from the formed 2,4,6-trialkylphenol, and recovering each of said alkylated phenols.
A method of making a 2,4,6-trialkylphenol comprising:
- (a) reacting phenol with an olefin over a bed of solid catalyst selected from the group consisting of alumina, fluorided alumina, chlorided alumina, and silica-alumina under alkylating conditions;
- (b) recovering the formed 2,4,6-trialkylphenol and separating 2,6-dialkylphenol therefrom;
- (c) mixing the separated 2,6-dialkylphenol with phenol;
- (d) reacting the mixture from step (c) with the olefin over the bed of solid catalyst under alkylating conditions;
- and repeating steps (b) through (d).
A method of making 2,4,6-triisopropylphenol which comprises reacting a feed mixture of 2,6-diisopropylphenol and phenol with propylene over a bed of solid catalyst selected from the group consisting of alumina, fluorided alumina, chlorided alumina, and silica-alumina under alkylating conditions, separating 2,6-diisopropylphenol from the formed 2,4,6-triisopropylphenol, and recovering each of said phenols.
Dependencies are inferred from the claim text.