Treatment of waste stream from pentaerythritol manufacture
US4612389A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 10, 1982 |
| Grant date | Sep 16, 1986 |
| Priority date | — |
| Expiry date | May 10, 2002 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07C31/245
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
This invention provides a process for improving the separation and recovery of metal formate and pentaerythritol as crystalline products, from an aqueous waste stream of a pentaerythritol manufacturing operation which involves the reaction of formaldehyde with acetaldehyde in the presence of a metal hydroxide catalyst. The pentaerythritol process waste stream is passed through a macroreticular resin bed to remove organic byproducts, and the purified waste stream is then evaporatively concentrated to produce crystalline sodium formate product. The resultant mother liquor is diluted with water-miscible alkanol to precipitate a pentaerythritol-metal formate mixture. The precipitate is washed with a portion of waste stream feed to dissolve the metal formate and yield undissolved crystalline pentaerythritol as a product. At least about 85 percent of the metal formate and at least about 90 percent of the pentaerythritol contained in the original waste stream are recovered as products of the process.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.