Oxidant for humic acid modification and method for preparing humic acid rich in carboxyl groups
US12378366B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Jan 18, 2025 |
| Grant date | Aug 5, 2025 |
| Priority date | — |
| Expiry date | Jan 18, 2045 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB01J37/0209
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
An oxidant for humic acid modification and a method for preparing humic acid rich in carboxyl groups are provided. The oxidant used for humic acid modification includes cobalt-nickel catalyst loaded on biochars and hydrogen peroxide solutions. When preparing humic acid rich in carboxyl groups, first dissolving the humic acid in a 2 wt % sodium hydroxide solution to prepare a sodium humate solution; then, under stirring conditions, adding the oxidant used for humic acid modification to the sodium humate solution and react at 45-55° C. for 90-150 minutes; then freeze-drying to obtain the final product. The present disclosure selectively breaks and destroys the aromatic carbon structure of humic acid by using cobalt-nickel catalyst loaded on biochar in combination with hydrogen peroxide solution, and avoids the release of carbon dioxide generated by excessive oxidation of humic acid carbon structure, thereby directionally increasing the carboxyl content of humic acid.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.