Vapor phase catalytic oxidation of propylene to acrylic acid
US6281384A · kind A · utility
Assignees
Inventors
Key dates
| Filing date | Jun 26, 1998 |
| Grant date | Aug 28, 2001 |
| Priority date | — |
| Expiry date | Jun 26, 2018 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07C51/252
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
An improved method for manufacturing acrylic acid by vapor phase oxidation of propylene in a single step or reaction stage using as solid phase oxidant a mixture of two particulate solids comprising a bismuth molybdate multimetal oxide (e.g., Mo.sub.12 Co.sub.3.5 Bi.sub.1.1 Fe.sub.0.8 W.sub.0.5 Si.sub.1.4 K.sub.0.05 O.sub.x) and a molybdenum vanadate multimetal oxide (e.g., Mo.sub.12 V.sub.4.8 Sr.sub.0.5 W.sub.2.4 Cu.sub.2.2 O.sub.x). Such a process is advantageously carried out in a recirculating solids reactor system wherein the particulate mixture of solids in an oxidized state reacts with a feed gas containing propylene in a vertical riser reactor and after separation from the acrylic acid gaseous product the particulate mixture of solids in a reduced state is regenerated by contact with an oxygen containing gas in a separate regeneration reactor before recirculation to the riser for further reaction.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.