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Lignin and cellulose recovery from hardwoods - by alkaline acid digestion, organic solvent extn., concn and alkali chlorite and hydroxide treatment
Lignin and cellulose recovery from hardwoods - by alkaline acid digestion, organic solvent extn., concn and alkali chlorite and hydroxide treatment
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机译：从硬木中回收木质素和纤维素-通过碱酸消化，有机溶剂萃取，浓缩和碱式亚氯酸盐和氢氧化物处理
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摘要
Lignin and cellulose are recovered from hardwood, e.g. beech and birch, by (a) organic solvent extn. of the solid residue obtd. by digesting hardwood in 2 steps: (1) with a 4(0.5-2) wt % concn. alkali hydroxide soln. and (2) with inorganic acid, and concentrating the organic soln. to recover lignin, and (b) recovering cellulose by treating residue from step (a) with alkali chlorite soln. and then (c) treating with alkali hydroxide soln. at raised temp. The reactive non-polymerised, thermoplastic lignin obtd. can be used as raw matl. for dyes and pesticides. Cellulose obtd. is white. The process allows the complete utilisation of the starting matl.
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