Cellulose acetate bound photosensitizer for producing singlet oxygen
US4986921A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 29, 1990 |
| Grant date | Jan 22, 1991 |
| Priority date | — |
| Expiry date | Aug 29, 2010 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB01J2531/26
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
This invention relates to a photosensitizer which is bound to a cellulose acetate polymer, a method of preparing the bound photosensitizer and a process for using the bound photosensitizer. The photosensitizers which may be used in the invention include rose bengal, rhodamine B, acridine orange, methylene blue and zinc phthalocyanine. The photosensitizer is attached to the cellulose acetate by reacting an acid group on the photosensitizer with a hydroxyl group. Finally, the bound photosensitizer may be used to oxidize undesirable oxidizable compounds present in a hydrocarbon or aqueous fraction. One specific example is the sweetening of kerosene which involves oxidizing the mercaptans contained in the kerosene.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.