Process for reduction of lignin color

Details Process for reduction of lignin color Process for reduction of lignin color

1975-04-18

1980-01-22

Clingman, A. Lionel

Bleaching and dyeing; fluid treatment and chemical modification

Treatment of hides, skins, feathers and animal tissues

Tanning

8 83, 8 89R, 8 93, 8173, 260124, 260124R, 260124B, C09B 900, C07G 100

Patent

active

041848454

ABSTRACT:
Disclosed herein is a two-step process for reducing the color of sulfonated alkali lignins and lignosulfonates by at least 80% which comprises, blocking at least 90% of the free-phenolic hydroxyl groups in the lignin and then subjecting the blocked lignins to oxidative action by air, molecular oxygen or hydrogen peroxide. The thus treated lignins are useful as dispersants for disperse dyes and vat dyes.

REFERENCES:
patent: 3672817 (1972-06-01), Falkehag
patent: 3763139 (1973-10-01), Falkehag
patent: 3769272 (1973-10-01), Hintz
patent: 3865803 (1975-02-01), Falkehag
patent: 4001202 (1977-01-01), Dilling et al.
Imsgard et al., Tappi, 1971, 54 (No. 10), pp. 1680-1684.
Brauns, F. E., "The Chemistry of Lignin", (Academic Press, New York-1952), pp. 303, 538, 541, 549.
Brauns, F. E. and Brauns, D. A., "The Chemistry of Lignin-Supplement Volume", (Academic Press, New York, 1960), pp. 507-510, 513-591.

Affiliated with

Also associated with

Rating

Process for reduction of lignin color does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Process for reduction of lignin color, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Process for reduction of lignin color will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-332506