Liquid Lignin from the SLRPTM Process: The Effect of Processing Conditions and Black-Liquor Properties
Liquid Lignin from the SLRPTM Process: The Effect of Processing Conditions and Black-Liquor Properties
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SLRPTM 工艺中的液态木质素：加工条件和黑液特性的影响
DOI：
10.1080/02773813.2015.1039545
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发表时间：
2016
影响因子：
2
通讯作者：
M. Thies
中科院分区：
文献类型：
--
作者：
Julian Velez;M. Thies
在SLRPTM工艺的研究中，在100-150°C的温度和5-8巴的压力下进行硫酸盐法黑液的CO2酸化。在这些条件下，高度水合的富含木质素的液体（与通常的固体相比）分离出来形成新相。发现起始黑液的固体含量/离子强度是控制“液体木质素”（LL）相的体积和分子性质的关键变量。例如，较低离子强度的黑液（20%固体）产生具有较低灰分含量和较高分子量的液体，尽管产率较低。相反，较高的离子强度/固体含量（40%）以较高的产率产生具有较高芳族和脂族羟基含量的液体。温度效应仅在最高水平上显著。发现LL相的水合程度是木质素中离子化/可极化基团水合可用的水的有用量度。
CO2 acidification of Kraft black liquors was performed at temperatures of 100–150°C and pressures of 5–8 bar in an investigation of the SLRPTM process. At these conditions, a highly hydrated, lignin-rich liquid (vs. the usual solid) separated out to form a new phase. The solids content/ionic strength of the starting black liquor was found to be a key variable for controlling the bulk and molecular properties of the „liquid-lignin” (LL) phase. For example, black liquors of lower ionic strengths (20% solids) produced LLs with lower ash contents and higher molecular weights, albeit in lower yields. In contrast, higher ionic strengths/solids content (40%) produced LLs in higher yields with higher aromatic and aliphatic hydroxyl contents. Temperature effects were significant only at the highest levels. The degree of hydration of the LL phase was found to be a useful measure of the water available for hydration of ionized/polarizable groups in lignin.