Purification and decolorization of off-color alkyl alkanolamines
US5208377A · kind A · utility
4Cited by
3References
14Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Sep 1, 1992 |
| Grant date | May 4, 1993 |
| Priority date | — |
| Expiry date | Sep 1, 2012 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07C213/10
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
Off-color N-(C.sub.4 -C.sub.10)alkyl di(C.sub.2 -C.sub.3) alkanolamines purified and decolorized by vacuum distillation at a pressure within the range of 1 to 50 mm.Hg (1-50 torr) in the presence of water and or water-soluble metal borohydride whereby the distilled alkanolamine has a reduced APHA color rating which is maintained on storage.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.