Process for producing pyrogallol
AssigneeMitsubishi Chemical Industries Limited
InventorsTakao Maki, Kenji Murayama
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Abstract
There is disclosed a process for producing pyrogallol by dehydrogenation of cyclohexane-1,2,3-triol in the presence of a platinum group metal catalyst in an inert gas stream. The catalyst contains, as modifier, (a) at least one alkali metal salt and/or (b) at least one member selected from the group consisting of gold, tellurium, silver, arsenic, selenium, indium, antimony, bismuth, copper and zinc, with the Pd-Te catalyst being preferred. The catalyst ingredients are supported on a carrier. The process gives high selectivity of pyrogallol.
Claims20
A process for producing pyrogallol comprising subjecting cyclohexane-1,2,3-triol to dehydrogenation in the presence of a platinum group metal catalyst in an inert gas stream.
A process for producing pyrogallol comprising introducing cyclohexane-1,2,3-triol and nitrogen and/or steam at a space velocity of 0.1 to 5 hr.sup.-1 and a gas hourly space velocity of 1,000 to 40,000 hr.sup.-1 at N.T.P., respectively, into a reactor packed with an activated carbon supported catalyst consisting essentially of palladium of 1 to 50% by weight based on the activated carbon, an alkali metal sulfate of 1 to 10% by weight based on the activated carbon and gold and/or tellurium of 0.05 to 0.5 gram atom per palladium and carrying out dehydrogenation of cyclohexane-1,2,3-triol at a temperature of 150.degree. to 350.degree. C.
Dependencies are inferred from the claim text.