Studies on the Lignin of Eucalyptus regnans. IV. Alkali Lignin

Abstract

By pulping Eucalyptus regnans using the soda process and acidifying the black liquor a crude alkali lignin has been isolated. This has been separated into two fractions, dioxan-ether insoluble alkali lignin-A and dioxan-ether soluble alkali lignin-B. A series of derivatives has been made from each. The data for alkali lignin-A are consistent with the empirical formula C₆₈H₇₈O₂₇, containing nine methoxyl. groups, three acidic, and four alcoholic hydroxyl groups, one of which is tertiary, one carbonyl, and one active methylene group. Alkali lignin-B has been found to be identical with the alkali lignin previously isolated from sulphate black liquor.