Production of unsaturated aliphatic aldehydes and the corresponding acids


Acrylic acid or methacrylic acid is obtained by reacting at an elevated temperature in the vapour phase acrolein or methacrolein respectively, or a compound which gives rise to acrolein or methacrolein under the reaction conditions, with oxygen over an oxidising catalyst comprising (i) a mixture of the oxides of molybdenum and cobalt and/or (ii) a compound of molybdenum, cobalt and oxygen. The catalyst may be deposited on a support, such as silica or alumina, and may contain minor quantities of tellurium oxides. Propylene or isobutene may be used as starting materials and these are converted to acrolein or methacrolein respectively under the reaction conditions. Preferably the reaction is carried out in the presence, as diluent, of a gas which is substantially inert under the reaction conditions, e.g. nitrogen, propane, butane, isobutane, carbon dioxide and steam. Preferably steam, nitrogen or mixtures thereof are used. The preferred temperature range for carrying out the reaction is 300-500 DEG C. Specifications 625,330, 648,386 and 878,803 are referred to.




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Cited By (4)

    Publication numberPublication dateAssigneeTitle
    US-3467700-ASeptember 16, 1969Goodrich Co B FMethod of preparing unsaturated aldehydes and acids
    US-3524823-AAugust 18, 1970Goodrich Co B FCatalyst and method of preparing unsaturated acids and aldehydes
    US-3624146-ANovember 30, 1971Grace W R & CoProcess for the production of acrylic acid from propylene
    US-B393347-I5January 28, 1975