Reduction of lignin color

Details Reduction of lignin color Reduction of lignin color

1982-11-01

1984-06-12

Phillips, Delbert R.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

C07G 100

Patent

active

044540663

ABSTRACT:
Sulfonated lignin and lignosulfonate color reductions of over 90 percent, and in some cases as high as 95 percent, are achieved by a two-step process involving the blocking of phenolic groups on the lignin molecule with known blocking agents followed by oxidation with chlorine dioxide. The light colored lignin dispersants produced by the invention process exhibit very low staining and low azo dye reduction, good heat stability, dye grinding efficiency, and dispersion stability.

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patent: 3672817 (1972-06-01), Falkehag et al.
patent: 3763139 (1973-10-01), Falkehag et al.
patent: 3769272 (1973-10-01), Hintz
patent: 3865803 (1975-02-01), Falkehag
K. V. Sarkanen, et al., "Lignins" (1971) p. 457.

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