Solvated liquid-lignin fractions from a Kraft black liquor.
Solvated liquid-lignin fractions from a Kraft black liquor.
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来自牛皮纸黑液的溶剂化液体木质素馏分。
DOI：
10.1016/j.biortech.2013.08.097
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发表时间：
2013
影响因子：
11.4
通讯作者：
M. Thies
中科院分区：
文献类型：
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作者：
Julian Velez;M. Thies
在115°C和6.2 bar的条件下，在13.6-9.5的pH范围内，用二氧化碳对软木硫酸盐黑液进行酸化，得到液化木质素馏分作为一个单独的相沉淀。生产了七个这样的“液体木质素”馏分，每个馏分在0.5单位的窄pH带内相分离。该馏分为高水合相，含水量为32.3 ~ 48.2% wt.%；因此，它们的测量熔点很低，为90.7-110.5°C。相比之下，干燥后的任何木质素组分在375°C以下均未检测到熔点。与原始黑液饲料相比，木质素组分的金属含量显著降低。
A softwood Kraft black liquor was acidified with carbon dioxide at 115 °C and 6.2 bar over a pH range of 13.6–9.5, resulting in the precipitation of liquefied-lignin fractions as a separate phase. Seven such “liquid-lignin” fractions were produced, with each fraction being phase-separated within a narrow pH band of 0.5 units. The fractions were found to be highly hydrated phases, containing 32.3–48.2 wt.% water; as a result, their measured melting points were quite low, 90.7–110.5 °C. In contrast, no melting point was detected up to 375 °C for any of the lignin fractions after drying. Significant reductions in metals content were observed for the lignin fractions compared to the original black-liquor feed.