Peroxyacid manufacture
US5220052A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 20, 1991 |
| Grant date | Jun 15, 1993 |
| Priority date | — |
| Expiry date | Nov 20, 2011 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07C409/40
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
In one class of processes for making poorly soluble organic peroxyacids the corresponding carboxylic acid is reacted with hydrogen peroxide in a reaction medium containing a high concentration of sulphuric acid. The presence of such constituents in the reaction mixture and the manner of the reactants and the way in which they are brought into contact, can result in the processes being hazardous. In the present invention, hazard problems are reduced or eliminated by first dissolving the carboxylic acid in concentrated sulphuric acid, secondly forming a Caro's acid solution containing a complementary amount of sulphuric acid and hydrogen peroxide within a predetermined range, and then introducing the carboxylic acid solution at a controlled rate in the Caro's acid solution, often over a period of from about 30 to 90 minutes, with agitation and temperature control. The compositions of the two reactant solutions are precalculated relative to each other such that the A value (weight ratio of sulphuric acid to the combined weight of it and water) either increases during addition of the carboxylic acid solution or if the latter is relatively less insoluble, stays the same or increases. Th…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.