Halohydrocarbon treatment of a glycol and waste dye liquor followed by water extraction of the glycol
US4165217A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 26, 1974 |
| Grant date | Aug 21, 1979 |
| Priority date | — |
| Expiry date | Nov 26, 1994 |
Classification
- Technology area (CPC D)Textiles; Paper
- CPC primaryD06P1/928
- WIPO fieldEnvironmental technology
- WIPO sectorChemistry
Abstract
A method for treating a wash waste liquor, which comprises treating fibers which have been dyed by applying a dye liquor containing a solution or dispersion of a non-ionic dye in a high boiling water-soluble organic medium or a mixture of it with a low boiling medium and then heating the fibers, with a low boiling organic solvent capable of dissolving the high boiling water-soluble organic medium, thereby to wash out the unfixed dye and the high boiling water-soluble organic medium remaining on the surface of the fibers; concentrating the wash waste liquor by evaporating at least a part of the low boiling organic solvent contained in the waste liquor; and extracting the high boiling organic medium from the concentrate using water.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.