Process for the o-substitution of phenols
AssigneeUnion Rheinische Braunkohlen Kraftstoff Aktiengesellschaft
InventorsMax Fremery, Karl-Heinz Keim, Joachim Korff
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Abstract
This invention relates to a process for reacting phenol, mono- and di-alkyl phenols having at least one free o-position with methanol and/or dimethyl ether in the gas phase to form o-substituted phenols in the presence of a catalyst of oxides of iron, chromium, silicon and at least one oxide of an alkaline-earth metal, lanthanum and manganese or in the presence of a catalyst of oxides of iron, chromium, a metal from the group comprising germanium, titanium, zirconium, tin, lead, and at least one oxide of an alkali metal, alkaline-earth metal, lanthanum and manganese.
Claims10
In a process for the production of ortho-methyl-substituted phenols by catalytically reacting phenols having at least one free o-position with methanol or dimethyl ether in the presence of a catalyst containing iron oxide and chromium oxide at an elevated temperature in the gas phase, the improvement which comprises reacting a compound selected from the group consisting of phenol, cresol, and xylenol for 0.05 to 10 seconds with methanol or dimethyl ether in a molar ratio of 1:0.1-10 at a temperature of between 270.degree.-390.degree. C. in the presence of a catalyst consisting of iron oxide, chromium oxide, silicon oxide and at least one oxide of a metal of the group consisting of alkaline earth metal, lanthanum and manganese, the molar ratio between the catalyst components being 100:0.1-10:0.1-10:0.01-10.
In a process for the production of ortho-methyl-substituted phenols by catalytically reacting phenols having at least one free o-position with methanol or dimethyl ether in the presence of a catalyst containing iron oxide and chromium oxide at an elevated temperature in the gas phase, the improvement which comprises reacting a compound selected from the group consisting of phenol, cresol, and xylenol for 0.05 to 10 seconds with methanol or dimethyl ether in a molar ratio of 1:0.1-10 at a temperature of between 270.degree.-390.degree. C. in the presence of a catalyst consisting of iron oxide, chromium oxide, at least one oxide of a metal of the group consisting of germanium, titanium, zirconium, tin and lead and at least one oxide of a metal of the group consisting of alkali, alkaline earth, lanthanum and manganese, the molar ratio between the catalyst components being 100:0.1-10:0.1-10:0.01-10.
Dependencies are inferred from the claim text.