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US 4,306,098 AGranted
Novel manufacture of 2,4,5-trichlorophenol
AssigneeIvon Watkins-Dow Limited
InventorEdgar G. Brooker
Life of this patent
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Abstract
A method of producing 2,4,5-trichlorophenol with low levels of the impurity 2,3,7,8-tetrachlorodibenzo-.rho.-dioxin.
Claims5
A process for the production of 2,4,5-trichlorophenol containing very low concentrations of the impurity 2,3,7,8-tetrachlorodibenzo-.rho.-dioxin, which comprises demethylation of 2,4,5-trichloroanisole, by treatment of said 2,4,5-trichloroanisole with aluminium chloride at temperatures of from about 25.degree. C. to reflux temperature of the reaction mixture in an aromatic, chloroaromatic, aliphatic or chloroaliphatic hydrocarbon solvent.
Dependencies are inferred from the claim text.