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Characterization of lignins obtained by selective precipitation

机译：通过选择性沉淀获得的木质素的表征

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摘要

In the present work lignin isolation from black liquor resulting from the Miscanthus sinensis pulping with 7.5% soda has been studied. M. sinensis is a raw straw widely studied as energy crop and for cellulose pulp production. Selective precipitation was achieved by decreasing black liquor pH from 12.64 to 0.72 and by adding sulphuric acid (98%, w/w). The precipitate percentage was obtained at each pH, regarding total dissolved solids. A considerable increase in the amount of precipitate was observed while lowering the pH as well as the attenuation in black liquor's colour. All samples along with commercial alkaline lignin were characterized by FT-IR, DSC, TGA, GPC and ~1H NMR to determinate the physico-chemical properties and structural features, and the results are reported.
机译：在目前的工作中，已经研究了从芒草制浆用7.5％的苏打水中分离出黑液中的木质素。中华芒草是一种粗秸秆，被广泛用作能源作物和纤维素纸浆生产。通过将黑液的pH从12.64降低到0.72并添加硫酸（98％，w / w）来实现选择性沉淀。关于总溶解固体，在每个pH下获得沉淀物百分比。观察到沉淀物量的显着增加，同时降低了pH值以及黑液颜色的减弱。所有样品以及市售碱性木质素均通过FT-IR，DSC，TGA，GPC和〜1H NMR进行表征，以确定其理化性质和结构特征，并报道了结果。

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