Chemistry: natural resins or derivatives; peptides or proteins; – Lignins or derivatives – Processes utilizing an organic solvent or a compound having...
Patent
1986-12-11
1988-08-16
Nielsen, Earl
Chemistry: natural resins or derivatives; peptides or proteins;
Lignins or derivatives
Processes utilizing an organic solvent or a compound having...
162 16, 162 29, 162 40, 162 77, C07G 100, D21C 320
Patent
active
047645962
ABSTRACT:
Lignin is precipitated in high yields and at high rates from a black liquor produced by pulping wood at high temperatures and pressures with an aqueous lower aliphatic alcohol solvent. The lignin is precipitated by diluting the black liquor with water and an acid to form a solution with a pH of less than about 3, an alcohol content of less than about 30% by volume and a temperature of less than about 75.degree. C. The precipitated lignin, when subsequently dried, is in the form of a powder which requires little or no crushing to convert it into a fine uniform size suitable for use without further significant processing.
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Marchessault et al., "Monomers and Oligomers from Wood", Pulp & Paper Mag. Canada, Transactions 6, 52-56, (1980).
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Lora et al., "Organosolv Pulping: A Versatile Approach", TAPPI Proceedings, 1984 Research and Development Conference, pp. 215-221, (1984).
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Glasser, "Potential Role of Lignin in Tomorrow's Wood Utilization Technologies", Forest Products J., 31, No. 3, pp. 24-29, (1981).
Cronlund Malcolm
Katzen Raphael
Lora Jairo H.
Wu Chih F.
Nielsen Earl
Repap Technologies Inc.
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