Method of removing amines
US5043075A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 24, 1990 |
| Grant date | Aug 27, 1991 |
| Priority date | — |
| Expiry date | May 24, 2010 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB01J39/07
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
There is disclosed a method of removing amines from aqueous solutions thereof, in particular from waste waters obtained in cellulose processing. The aqueous amine solutions are contacted with a cation exchanger whose anchor groups consist of carboxyl groups, in order to charge the cation exchanger with the amines. The charged cation exchanger is treated with an aqueous solution of a weak acid having a pK.sub.a larger than 3.0 in order to elute the amines. The eluate is processed by way of distillation, wherein a portion of the weak acid is separated from the amines and reclaimed, if desired. The method according to the invention offers a simple and cheap way of disposing amine-containing waste waters.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.