Process for liquefaction of lignin

Details Process for liquefaction of lignin Process for liquefaction of lignin

1986-01-22

1988-03-15

Nielsen, Earl

Organic compounds -- part of the class 532-570 series

Organic compounds

Oxygen containing

530502, 530503, 568716, 568799, C08H 1502, C07C 3700

Patent

active

047314915

ABSTRACT:
Liquefaction of lignin by hydrogenolysis in the presence of a catalytic composition of metal sulfides which are prepared in situ and in the presence of a lower aliphatic alcohol affords substantially increased yields of monophenols. When methanol is used in the presence of a catalyst which is a mixture of the sulfides of divalent iron, copper, and tin the total monophenols can be as high as 65% with the total cresols being about 45%. Phenol, which is used as a liquefying solvent, can itself be formed in good yield when lignin tar is used as the liquefying solvent. This affords the opportunity of conducting the liquefaction in a continuous fashion using two stages of reaction.

REFERENCES:
patent: 3105095 (1963-09-01), Oshima et al.
patent: 3223698 (1965-12-01), Oshima et al.
patent: 3253044 (1966-05-01), Goheen
patent: 4420644 (1983-12-01), Huibers et al.
patent: 4647704 (1987-03-01), Engel et al.
David W. Goheen, Lignin Structure and Reactions, American Chemical Society, Advances in Chemistry, Series No. 59.
Kirk-Othmer, "Encyclopedia of Chemical Technology", Third Edition, vol. 14, pp. 307-308 (J. Wiley and Sons Inc., 1980).

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