Diamine recovery process
US4380615A · kind A · utility
4Cited by
7References
8Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Mar 5, 1981 |
| Grant date | Apr 19, 1983 |
| Priority date | — |
| Expiry date | Mar 5, 2001 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08G69/28
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
The efficiency of a rectifying zone for the recovery of diamine vapor from water vapor being separated from a reaction zone in which a polyamide-forming salt is being heated to form a prepolymer is improved by adding a dicarboxylic acid to the reflux water at the top of the rectifying zone.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.