Production of 3-methylphenol

Details Production of 3-methylphenol Production of 3-methylphenol

C - Chemistry, Metallurgy

07

C

260/621.5

C07C 39/07 (2006.01) B01J 29/40 (2006.01) B01J 29/70 (2006.01) C07C 2/66 (2006.01) C07C 4/18 (2006.01) C07C 7/148 (2006.01) C07C 15/02 (2006.01) C07C 37/08 (2006.01) C07C 39/06 (2006.01) C07C 39/08 (2006.01) C07C 45/53 (2006.01) C07C 409/08 (2006.01)

Patent

CA 1128549

ABSTRACT OF THE DISCLOSURE Described herein is a four-step process for preparing 3-methylphenol (m-cresol). This process comprises: (A) alkylating toluene with an alkylating agent which is an unsaturated hydrocarbon having 2 to 20 carbon atoms at a temperature of from 100° to 400°C and a pressure of from 105 N/m2 to about 4 X 106 N/m2 in the presence of a zeolite alkylation catalyst having a silica to alumina ratio of at least 12 and a constraint index of from about 1 to about 12; (B) contacting the product of step (A) at a temperature of from about 150°C to about 800°C and a pressure of between about104 N/m2 and 107 N/m2, with a shape selective zeolite catalyst which has a constraint index of from about 1 to about 12 and a silica to alumina rakion of at least 12, to selectively react the 3-alkyltoluene component thereof, and thereby enrich the reaction mixture with respect to the 3-alkyltoluene component thereof; (C) oxidizing the mixture produced in step (B) to produce the hydroperoxide of said 3-alkyltoluene; and (D) rearranging the hydroperoxide of said 3-alkyltoluene in the presence of an inorganic acid catalyst or cation exchanqe resin. 3-methylphenol is thereby produced in substantially higher yields than have been obtained heretofore.

341880

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