SULFONATED LIGNIN AS A BY-PRODUCT OF PAPERMAKING WOOD PULP/UREA-FORMALDEHYDE FERTILIZER AND METHOD FOR PREPARING THE SAME BY A REACTIVE EXTRUSION AND GRANULATION PROCESS
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United States of America Patent
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Apr 25, 2024
app pub date -
Dec 15, 2023
filing date -
Dec 15, 2023
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A sulfonated lignin as a by-product of papermaking wood pulp/urea-formaldehyde (UF) fertilizer and a method for preparing the same by a reactive extrusion and granulation process are provided. The method includes: mixing a hydroxymethylated sulfonated lignin solution with a hydroxymethyl-urea solution followed by feeding into a reaction-extrusion integrated machine and reaction at a preset temperature for a preset time; subjecting the reaction mixture to extrusion through a twin-screw extruder to obtain a strip product; and drying the strip product followed by granulation to obtain a sulfonated lignin as a by-product of papermaking wood pulp/UF fertilizer columnar particles. Sulfonated lignin molecules are introduced to the main chain of the UF macromolecules to reduce the polymerization degree and crystallinity of the UF fertilizer, so as to regulate the nitrogen release rate.
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