Two stage process for the production of unsaturated carboxylic acids by oxidation of lower unsaturated hydrocarbons
US6441227B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Jun 23, 2000 |
| Grant date | Aug 27, 2002 |
| Priority date | — |
| Expiry date | Jun 23, 2020 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07C51/252
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
A process for the production of alpha-beta unsaturated carboxylic acid with high yield at low temperature and atmospheric pressure, includes two stages for catalytic vapor-phase oxidation of olefins with molecular oxygen. In a first stage, olefins are oxidized using catalyst A having a composition according to the formulaMoaPdbBicFedX1eX2fX3gOz,whereinX1=one or more of Co, Ni, V, Pt, Rh; X2=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; and O=oxygen; to produce a first stage product containing alpha-beta unsaturated aldehydesIn a second stage, alpha-beta unsaturated aldehydes in the first stage product are oxidized using catalyst B having a composition according to the formulaMoa1Vb1Alc1Xd1Ye1Oz1whereinX=W or Mn or both; Y=at least one or more of Pd, Sb, Ca, P, Ga, Ge, Si, Mg, Nb, K; and O is oxygen which satisfies the valences of the other elements; to produce mainly alpha-beta unsaturated carboxylic acid. A portion of the oxygen is introduced into the reaction stream between the first and second stages or in multistages. More particularly, the invention relates to a two stage process for catalytic oxidation of propylene …
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.