Process for preparing carboxylic acid esters from toluene and xylene
AssigneeMitsubishi Chemical Industries Limited
InventorsTakeru Onoda, Keisuke Wada, Masayuki Otake
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Abstract
A carboxylic ester is prepared by reacting a hydrocarbon selected from monoolefins having 2 to 6 carbon atoms, benzene, toluene and xylene with an aliphatic saturated carboxylic acid having 2 to 4 carbon atoms and molecular oxygen in the vapor phase in the presence of a supported solid catalyst of palladium metal, an antimony component and a carboxylic acid salt of alkali metal, alkaline earth metal, zinc, cadmium, lead or tin, with the improvement comprising: adding said antimony compound to the support of said catalyst by dipping a carrier into an aqueous solution of water-soluble antimony compound selected from the group consisting of antimonic acid, antimonates and antimony complexes of organic acids.
Claims10
In a process for preparing a carboxylic ester by reacting a hydrocarbon selected from the group consisting of toluene and xylene with an alkanoic carboxylic acid having 2 to 4 carbon atoms and molecular oxygen in the vapor phase in the presence of a supported solid catalyst of palladium metal, antimony oxide and a carboxylic acid salt of an alkali metal, an alkaline earth metal, zinc, cadmium, lead or tin, the improvement comprising:
- adding said antimony oxide to the support of said catalyst by dipping a carrier into an aqueous solution of a water soluble antimony compound selected from the group consisting of antimonic acid, antimonates and antimony complexes of oxalic, glycolic or tartaric acids;
- and calcining said dipped carrier at a temperature of from 500.degree. - 900.degree. C.
Dependencies are inferred from the claim text.