Color reduction process for non-sulfonated lignin

Details Color reduction process for non-sulfonated lignin Color reduction process for non-sulfonated lignin

C - Chemistry, Metallurgy

09

B

260/133

C09B 67/46 (2006.01) C09D 11/02 (2006.01) C07G 1/00 (2006.01) C08H 6/00 (2010.01)

Patent

CA 1218056

COLOR REDUCTION PROCESS FOR NON-SULFONATED LIGNIN Abstract of the Invention Non-sulfonated lignin color reductions of over 90 per cent, and in some cases as high as 95 per cent, are achieved by a three-step process involving (1) methylolating or crosslinking the lignin, (2) the blocking of phenolic groups on the lignin molecule with blocking agents followed by (3) 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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