Purification of stable organic compounds
US5443742A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 7, 1994 |
| Grant date | Aug 22, 1995 |
| Priority date | — |
| Expiry date | Nov 7, 2014 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S430/166
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
Metal oxidizing agents (such as silver oxide or silver nitrate) are added to a solution of organic chemicals which comprise an unwanted level of organic reducing agents (either aqueous or organic solutions in which the metal oxidizing agent does not dissolve) and the metal oxidizing agent oxidizes at least some portion of said organic reducing agents. Because the metal oxidizing agent is insoluble in the solution, it is readily removed (e.g., by filtration or sedimentary techniques) to leave a solution with reduced amounts of reducing agents therein. This process is particularly useful for purifying phthalazine, behenic acid, and other toners, the component forming the counterion with silver ion in forming the light-insensitive silver source material and any other additives and raw materials which can be dissolved in a solvent medium in which the metal oxidizing agent is not highly soluble.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.