Patent ID: 6441227
Filing Date: 2002-08-27
Classification: C07C

Abstract:
A process for production of carboxylic acid using a two-stage catalytic vapor-phase oxidation of olefins comprisesintroducing into a first stage reactor, a feedstream comprising olefins, oxygen, steam and inert gas; contacting the feedstream in the first stage reactor with a catalyst composition comprising a catalyst having the formula MoaPdbBicFedX1eX2fX3gOz whereinX1=at least one or more of Co, Ni, V, Pt, Rh X2=at least one or more of Al, Ga, Ge, Mn, Nb, Zn, Ag, P, Si, W X3=at least one or more of K, Mg, Rb,Ca, Sr, Ba, Na O=oxygen a is 1, 000000z is a number which satisfies the valences of the other elements in the formula, said contacting in the first stage reactor being under reaction conditions sufficient to produce a first stage product comprising aldehyde; introducing the first stage product into a second stage reactor; contacting the first stage product in the second stage reactor with a catalyst composition comprising a catalyst having the formula Moa1Vb1Alc1Xd1Ye1Oz1 whereinX=W or Mn or both Y=at least one or more of Pd, Sb, Ca, P, Ga, Ge, Si, Mg, Nb, K O is the valence oxygen, and a is 1, b is 0.01 to 0.9, 000z is a number which satisfies the valences of the other elements in the formula; and said contacting in the second stage reactor being under conditions sufficient to produce a second stage product comprising carboxylic acid.