Lignin-based multipurpose fertilizers
AssigneeEmpire Technology Development LLC
InventorGeorgius Abidal Adam
Life of this patent
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Abstract
Methods for converting waste streams from the wood pulping industry to high-value fertilizers are described. For example, isolated lignin and lignosulphonate or waste streams containing lignin and lignosulphonate can be converted to methylol derivatives and treated with further reagents to produce controlled release fertilizers, hydrogel fertilizers, and soil stabilizers.
Claims21
A method of preparing a controlled release fertilizer, the method comprising contacting a crosslinking agent selected from an isocyanate terminated polyol;
- a polyhydroxy carboxylic acid;
- a polyamino acid;
- chondroitin;
- chondroitin sulphate;
- or a combination thereof, a lignin-based material and at least one reagent comprising a methylol of a nitrogen-based compound to produce a mixture comprising the controlled release fertilizer, wherein the lignin-based material has about 1 to about 4 methylol groups per lignin unit.
A method of preparing a hydrogel controlled release fertilizer, the method comprising contacting a crosslinking agent selected from an isocyanate terminated polyol;
- a polyhydroxy carboxylic acid;
- a polyamino acid;
- chondroitin;
- chondroitin sulphate;
- or a combination thereof, a lignin-based material and at least one reagent to produce a mixture comprising the hydrogel controlled release fertilizer, wherein the at least one reagent comprises a methylol of a nitrogen-based compound, a hydrogel forming material, or a combination thereof, wherein the lignin-based material has about 1 to about 4 methylol groups per lignin unit.
Dependencies are inferred from the claim text.