Method of manufacturing .alpha.-oxocarboxylate and catalyst adopted in the method
US5750768A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 6, 1996 |
| Grant date | May 12, 1998 |
| Priority date | — |
| Expiry date | Aug 6, 2016 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07C67/39
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
A method of manufacturing .alpha.-oxocarboxylate includes the steps of: (i) carrying out a vapor phase oxidation of 1,2-diol of formula (1) in a primary reaction vessel, (ii) introducing a resulting gaseous .alpha.-oxoaldehyde and/or .alpha.-hydroxyaldehyde in a secondary reaction vessel together with alcohol or olefin which is converted into a gas form in a vaporizing chamber, and (iii) carrying out an oxidative esterification of the gaseous .alpha.-oxoaldehyde and/or .alpha.-hydroxyaldehyde molecular oxygen in a presence of inorganic oxide containing phosphorus as a catalyst in the secondary reaction vessel, ##STR1## (R is a hydrogen atom or an organic residue). The described method permits .alpha.-oxocarboxylate to be manufactured economically and effectively in practically one step using inexpensive 1,2-diol such as ethylene glycol or propylene glycol.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.