Process for the production of o-alkylated phenols
AssigneeMitsui Toatsu Chemicals, Inc.
InventorsMotoo Kawamata, Kazushi Ohshima, Mitsuo Onofusa, Akihide Kudoh, Makoto Kotani, Takeshi Tsuda
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Abstract
A process for the production of alkyl phenols having at least one o-alkyl radical comprising catalytically reacting a phenolic compound having at least one o-positioned hydrogen atom with an alcohol in the vapor phase in the presence of a manganese oxide containing catalyst modified with a compound of at least one of the alkali metals.
Claims12
In a process for producing an o-alkylated phenol wherein a phenol compound of the formula:
- ##STR2## where R.sub.1, R.sub.2, R.sub.3 and R.sub.4 stand for hydrogen, alkyl radicals of 1 to 4 carbon atoms, or unsubstituted or substituted phenyl radicals, is reacted with a saturated aliphatic alcohol having from 1 to 4 carbon atoms in the presence of a catalyst at a temperature of from 300.degree. to 500.degree. C., the molar ratio of said phenol compound to said alcohol ranging from 1:1 to 1:15, the improvement in which said catalyst is selected from manganese oxide-containing catalysts prepared by modifying:
- (a) a catalyst composition comprising manganese oxide and silicon oxide, or
- (b) a catalyst composition comprising manganese oxide, silicon oxide and at least one alkaline earth metal oxide
- with at least one alkali metal compound, the atomic ratio of Mn:Si:alkali metal in said catalyst prepared by modifying the catalyst composition (a) being 100:0.01-20:10.sup.-5 -5, and the atomic ratio of Mn:Si:alkaline earth metal:alkali metal in said catalyst prepared by modifying the catalyst composition (b) being 100:0.01-20:0.01-30:10.sup.-5 -5.
A process for producing an o-alkylated phenol comprising reacting a phenol compound of the formula:
- ##STR3## where R.sub.1, R.sub.2, R.sub.3 and R.sub.4 stand for hydrogen, alkyl radicals of 1 to 4 carbon atoms, or unsubstituted or substituted phenyl radicals, with a saturated aliphatic alcohol in the presence of a catalyst at a temperature of from 300.degree. to 500.degree. C., the molar ratio of said phenol compound to said alcohol ranging from 1:1 to 1:14, said catalyst comprising manganese oxide, silicon oxide, and at least one alkali metal compound, the atomic ratio of Mn:Si:alkali metal in said catalyst being 100:0.01-20:10.sup.-5 -5.
A process for producing an o-alkylated phenol comprising reacting a phenol compound of the formula:
- ##STR4## where R.sub.1, R.sub.2, R.sub.3 and R.sub.4 stand for hydrogen, alkyl radicals of 1 to 4 carbon atoms, or unsubstituted or substituted phenyl radicals, with a saturated aliphatic alcohol of from 300.degree. to 500.degree. C., the molar ratio of said phenol compound to said alcohol ranging from 1:1 to 1:14, said catalyst comprising manganese oxide, silicon oxide, at least one alkaline earth metal oxide, and at least one alkali metal compound, the atomic ratio of Mn:Si:alkaline earth metal:alkali metal in said catalyst being 100:0.01-20:0.01-30:10.sup.-5 -5.
Dependencies are inferred from the claim text.