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首页> 外文期刊>Journal of Wood Chemistry and Technology >Investigation and Characterization of Lignin Precipitation in the LignoBoost Process
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Investigation and Characterization of Lignin Precipitation in the LignoBoost Process

机译：LignoBoost过程中木质素沉淀的研究与表征

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摘要

Lignin of high purity can be separated from black liquor using the LignoBoost process, of which the overall efficiency is largely dependent on the precipitation yield of lignin, which depends on the properties of black liquor and process conditions. In this paper, the influences of process conditions on the precipitation yield of lignin from mixed hardwood/softwood black liquor were investigated. The Klason and standard UV method were used to determine lignin concentration. The chemical and structural properties of lignin were also analyzed. The results showed that the precipitation yield of lignin increased along with a decrease in pH and temperature, or with an increase in the ion strength of black liquor, and the yield was lower when mixed softwood/hardwood black liquor was used. It also showed that at a higher precipitation yield the precipitated lignin had a lower average molecular weight but had higher methoxyl and phenolic hydroxyl content.
机译：可以使用LignoBoost工艺从黑液中分离出高纯度的木质素，其总效率在很大程度上取决于木质素的沉淀收率，这取决于黑液的性质和工艺条件。本文研究了工艺条件对混合硬木/软木黑液中木质素沉淀产量的影响。使用Klason和标准UV方法确定木质素浓度。还分析了木质素的化学和结构性质。结果表明，木质素的沉淀产量随着pH值和温度的降低或黑液离子强度的增加而增加，而当使用混合软木/硬木黑液时，产量降低。还表明，在较高的沉淀产率下，沉淀的木质素具有较低的平均分子量，但是具有较高的甲氧基和酚羟基含量。

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