Process for the preparation of aromatic aldehydes
AssigneeNational Distillers and Chemical Corporation
InventorsJack Kwiatek, Jawad H. Murib, Charles K. Brush
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Abstract
A process is described for the preparation of aromatic aldehydes such as benzaldehyde or substituted benzaldehydes involving the vapor phase oxidation of aralkyl compounds such as toluene or substituted toluenes, respectively, at temperatures of less than about 250.degree.C. in the presence of a catalyst composition containing phosphoric acid and a catalytically effective amount of palladium metal. The aromatic aldehydes are produced in a single reaction step.
Claims15
A process for the preparation of aromatic aldehydes which consists essentially of oxidizing in the vapor phase an organic compound selected from the group consisting of toluene, xylene, p-cymene, mesitylene, durene, pentamethylbenzene, hexamethylbenzene, methylnaphthalene, p-phenyltoluene, 2,2-di(p-tolyl) propane, methoxytoluene, p-phenoxytoluene, ditolyl ether, 2,5-dimethoxytoluene, methyl p-toluate, p-methyl benzoic acid, p-methylbenzophenone, and 4-methylphthalic anhydride, with molecular oxygen at a temperature of from about 100.degree.-250.degree.C. in the presence of a supported catalyst composition, said catalyst composition being supported on an inert carrier material having about 1-50 percent by weight of phosphoric acid impregnated therein and about 0.1-5 percent by weight of palladium in the form of palladium metal or palladium metal admixed, alloyed or in solid solution with about 1-200 percent based on the palladium of a Group IB or VIII metal selected from the group consisting of gold, platinum, silver, rhodium, ruthenium and iridium deposited thereon.
A vapor phase process for the preparation of benzaldehyde which comprises reacting a gaseous mixture consisting essentially of toluene, molecular oxygen and water vapor at a temperature of from about 100.degree. to 250.degree. C. in the presence of a supported catalyst composition, said catalyst composition being supported on an inert carrier material having about 5 to 30% by weight of phosphoric acid impregnated therein and about 0.5 to 3% by weight of palladium in the form of palladium metal or palladium metal admixed, alloyed or in solid solution with about 1-200 weight percent based on the palladium of a Group IB or Group VIII metal selected from the group consisting of gold, platinum, slver, rhodium, ruthenium and iridium deposited thereon.
Dependencies are inferred from the claim text.