Percarboxylic acid solutions
US6274542A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 2, 1999 |
| Grant date | Aug 14, 2001 |
| Priority date | — |
| Expiry date | Nov 2, 2019 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07C407/00
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
Storage stable aqueous acidic solutions, often having a pH of up to 1 containing an ester peracid and/or an acid peracid can be obtained by reacting a diester satisfying the general formula R.sup.1 --O--CO--R.sup.2 --CO--O--R.sup.3 in which R.sup.1 and R.sup.3 each represents a alkyl group containing from 1 to 4 carbon atoms which may the same of different and R.sup.2 represents an aliphatic alkylene group optionally unsaturated which may be linear or branched containing from 2 to 6 carbon atoms with aqueous hydrogen peroxide in the presence of an acid, such as sulphuric acid and permitting the compositions to progress towards equilibrium concentrations. By starting with a diester, perhydrolysis generates an ester peracid which is a particularly effective peracid. The process can be controlled to produce solutions containing a high peracid content and within a wide range of ratios of ester peracid to acid peracid.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.