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Title: Method for recovering and using lignin in adhesive resins by extracting demethylated lignin

Abstract

Lignin, or a lignin derived material, which has been significantly demethylated (e.g., the demethylated lignin found in the raffinate produced as a by-product of dimethyl sulfide production which can be carried out using the spent liquor from wood pulping operations) can be isolated by a process wherein an organic solvent is added to a lignin-containing aqueous solution. The organic solvent is typically a polar, and at least a partially water-immiscible substance such as, for example, ethyl acetate. The resulting lignin-containing aqueous solution/organic solvent mixture is acidified to produce a water layer which is discarded and an organic solvent layer which contains the demethylated lignin. Upon its recovery, the demethylated lignin is dissolved in an alkaline solution to which an aldehyde source is added to produce a resol-type resin. The aldehyde source may be formaldehyde in solution, paraformaldehyde, hexamethylenetetramine, or other aldehydes including acetaldehyde, furfural, and their derivatives.

Inventors:
 [1]
  1. (Ft. Collins, CO)
Issue Date:
OSTI Identifier:
867886
Patent Number(s):
5026808
Assignee:
Colorado State University Research Foundation (Ft. Collins, CO) OSTI
Resource Type:
Patent
Country of Publication:
United States
Language:
English
Subject:
method; recovering; lignin; adhesive; resins; extracting; demethylated; derived; material; significantly; found; raffinate; produced; by-product; dimethyl; sulfide; production; carried; spent; liquor; wood; pulping; operations; isolated; process; organic; solvent; added; lignin-containing; aqueous; solution; typically; polar; partially; water-immiscible; substance; example; ethyl; acetate; resulting; mixture; acidified; produce; water; layer; discarded; contains; recovery; dissolved; alkaline; aldehyde; source; resol-type; resin; formaldehyde; paraformaldehyde; hexamethylenetetramine; aldehydes; including; acetaldehyde; furfural; derivatives; lignin-containing aqueous; organic solvent; aqueous solution; ethyl acetate; demethylated lignin; solvent mixture; alkaline solution; raffinate produced; pulping operations; significantly demethylated; resulting lignin-containing; water layer; water-immiscible substance; spent liquor; solvent layer; wood pulping; lignin found; lignin derived; partially water-immiscible; adhesive resins; sulfide production; wood pulp; dimethyl sulfide; derived material; immiscible substance; extracting demethylated; partially water; /527/530/

Citation Formats

Schroeder, Herbert A. Method for recovering and using lignin in adhesive resins by extracting demethylated lignin. United States: N. p., 1991. Web.
Schroeder, Herbert A. Method for recovering and using lignin in adhesive resins by extracting demethylated lignin. United States.
Schroeder, Herbert A. Tue . "Method for recovering and using lignin in adhesive resins by extracting demethylated lignin". United States. https://www.osti.gov/servlets/purl/867886.
@article{osti_867886,
title = {Method for recovering and using lignin in adhesive resins by extracting demethylated lignin},
author = {Schroeder, Herbert A.},
abstractNote = {Lignin, or a lignin derived material, which has been significantly demethylated (e.g., the demethylated lignin found in the raffinate produced as a by-product of dimethyl sulfide production which can be carried out using the spent liquor from wood pulping operations) can be isolated by a process wherein an organic solvent is added to a lignin-containing aqueous solution. The organic solvent is typically a polar, and at least a partially water-immiscible substance such as, for example, ethyl acetate. The resulting lignin-containing aqueous solution/organic solvent mixture is acidified to produce a water layer which is discarded and an organic solvent layer which contains the demethylated lignin. Upon its recovery, the demethylated lignin is dissolved in an alkaline solution to which an aldehyde source is added to produce a resol-type resin. The aldehyde source may be formaldehyde in solution, paraformaldehyde, hexamethylenetetramine, or other aldehydes including acetaldehyde, furfural, and their derivatives.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1991},
month = {1}
}

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