Method for extracting amine compounds from a liquid medium
US6312578A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 7, 1999 |
| Grant date | Nov 6, 2001 |
| Priority date | — |
| Expiry date | Sep 7, 2019 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07C227/40
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
The invention concerns a method for extracting by electrodialysis a compound comprising at least amine functions capable of protonation from a liquid medium. More particularly it concerns a method for extracting, and separating at least the monomers comprising amine functions capable of protonation from a liquid medium derived from the hydrolysis of polyamides. The method of extraction from a liquid medium consists in subjecting to protonation the amine function(s) of the compounds to be extracted by adjusting the pH of the medium and in separating the compounds by passing them through a cationic membrane under the effect of an electric current. The invention is particularly applicable in processes for the chemical stabilisation of polyamides such as the PA 66 PA 6.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.