Hydroxycarboxylic acids and salts
US8961813B2 · kind B2 · utility
1Cited by
61References
25Claims
0Family size
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Key dates
| Filing date | Aug 16, 2012 |
| Grant date | Feb 24, 2015 |
| Priority date | — |
| Expiry date | Aug 16, 2032 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC04B2103/61
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
Compositions which inhibit corrosion and alter the physical properties of concrete (admixtures) are prepared from salt mixtures of hydroxycarboxylic acids, carboxylic acids, and nitric acid. The salt mixtures are prepared by neutralizing acid product mixtures from the oxidation of polyols using nitric acid and oxygen as the oxidizing agents. Nitric acid is removed from the hydroxycarboxylic acids by evaporation and diffusion dialysis.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.