Process for producing cationic lignin copolymer under aqueous acid conditions
US12234165B2 · kind B2 · utility
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Key dates
| Filing date | Mar 7, 2018 |
| Grant date | Feb 25, 2025 |
| Priority date | — |
| Expiry date | Sep 10, 2038 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08K2003/324
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
A water-based process was developed for the synthesis of aminated lignin copolymers with high MW, thermal stability and solubility in water over a wide range of p H values. The cationic lignin copolymer described herein comprises: a grafting ratio of (weight of cationic amine compound)/(weight of lignin) of 70 to 200% and a charge density of +1.4-3.0 meq/g. This cationic lignin copolymer can be used as a flocculant in numerous wastewater streams including municipal and industrial systems and sludge dewatering in the pulp & paper, mining and oil industries.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.