HBS Pulping (5)

Chemical Structure and Properties of HBS Lignin

Abstract

Chips of fir (T)(A. Sachalinensis Mast.) as softwood and birch (B)(B. platyphylla var. japonica Hara) as hardwood were pulped by HBS pulping process with fresh HBS of 1, 4-butanediol and its recovered solvents (RHBS-1 and 2) prepared from spent liquors. HBS lignins (HL). that is. BL-1-3 and TL-1-3 were isolated in yields of 90-150% based of chips from the spent liquors of birch and fir, respectively. Furthermore. HL was fractionated into ether insolubles (IS) and solubles (S) to analyze. Each the lignin was subjected to elemental. spectral spectrographic (UV and NMR), thermomechanical, gel permeation chromatographic analyses, determination of hydroxyl groups, and also nitrobenzene oxidation.