US 12,234,165 B2
Process for producing cationic lignin copolymer under aqueous acid conditions
Pedram Fatehi, Thunder Bay (CA); Shoujuan Wang, Jinan (CN); Jacquelyn Price, Port Burwell (CA); Naceur Jemaa, Pointe-Claire (CA); Talat Mahmood, Kirkland (CA); and Michael Paleologou, Beaconsfield (CA)
Assigned to FPInnovations, Pointe-Claire (CA); and LAKEHEAD UNIVERSITY, Thunder Bay (CA)
Appl. No. 16/492,201
Filed by FPInnovations, Pointe-Claire (CA); and LAKEHEAD UNIVERSITY, Thunder Bay (CA)
PCT Filed Mar. 7, 2018, PCT No. PCT/CA2018/050269
§ 371(c)(1), (2) Date Sep. 9, 2019,
PCT Pub. No. WO2018/161164, PCT Pub. Date Sep. 13, 2018.
Claims priority of provisional application 62/468,981, filed on Mar. 9, 2017.
Prior Publication US 2021/0198434 A1, Jul. 1, 2021
Int. Cl. C02F 1/56 (2023.01); C02F 11/147 (2019.01); C08F 289/00 (2006.01); C08H 7/00 (2011.01); C08K 3/32 (2006.01)
CPC C02F 1/56 (2013.01) [C02F 11/147 (2019.01); C08F 289/00 (2013.01); C08H 6/00 (2013.01); C08K 3/32 (2013.01); C08K 2003/324 (2013.01)] 12 Claims
OG exemplary drawing
 
1. A method for preparing a cationic lignin copolymer comprising:
providing water;
providing a kraft lignin;
providing at least one monomer compound, wherein the monomer compound is a cationic amine compound; and
mixing the water, the lignin, and the at least one monomer compound under acidic free radical generating conditions, to polymerize the lignin and at least one monomer compound in aqueous suspension and to produce the cationic lignin copolymer;
wherein the cationic amine compound is selected from the group consisting of: N,N-dimethyldiallyl ammonium chloride (DADMAC); N,N′-methylenebisacrylamide; [2-(Methacryloyloxy)ethyl] trimethylammonium chloride (METAC), [3-(Methacryloylamino)propyl] trimethylammonium chloride (MAPTAC), [2-(Acryloyloxy)ethyl] trimethyl ammonium chloride (ATAC) and [2-(Methacryloyloxy)ethyl] trimethyl ammonium methyl sulfate (METAM), and
wherein the cationic lignin copolymer is a flocculant having a molecular weight of 1.3×106 to 1.5×106 g/mol,
wherein the cationic lignin copolymer is produced free of oxidizing enzymes.