Process for producing diamine and polyamide
US8334411B2 · kind B2 · utility
3Cited by
1References
20Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Mar 11, 2009 |
| Grant date | Dec 18, 2012 |
| Priority date | — |
| Expiry date | Nov 28, 2029 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB01D2317/022
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
A method for producing a diamine includes purifying a diamine from an aqueous solution containing a diamine salt by adding an alkaline substance to the aqueous solution and then filtering the resulting solution by allowing the solution to pass through a nanofiltration membrane to remove the salt, thereby obtaining an aqueous diamine solution.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.