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.