WASTE-FREE PROCESSING FOR LIGNIN MODIFICATION OF FIBROUS PLANT MATERIALS, AND LIGNIN-MODIFIED FIBROUS PLANT MATERIALS
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United States of America Patent
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Issued Date -
Mar 14, 2024
app pub date -
Aug 27, 2022
filing date -
Aug 27, 2021
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Abstract
A piece of natural fibrous plant material, such as wood or bamboo, can be infiltrated with a chemical solution and subsequently subjected to a temperature of at least 80° C. to produce a softened piece of fibrous plant material having modified lignin therein. The content of modified lignin in the softened piece can be at least 90% of the content of native lignin in the natural fibrous plant material. The modified lignin retained in the softened piece can have shorter macromolecular chains than that of the native lignin. The softened piece can be subjected to densification, for example, to yield a high-strength structural material, or to subsequent drying, for example, to yield a flexible or anisotropically-clastic material. The processing of the natural fibrous plant material can avoid, or at least reduce, the production of black liquor or other waste liquids.
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