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首页> 外文期刊>Journal of Wood Chemistry and Technology >Performance of Softwood Soda-Anthraquinone Lignin as Water-Reducing Chemical Admixture in Concrete
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Performance of Softwood Soda-Anthraquinone Lignin as Water-Reducing Chemical Admixture in Concrete

机译：软木苏打-蒽醌木质素作为混凝土中减水剂的性能

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摘要

We have attempted to establish a new process for producing a concrete chemical admixture prepared with by-product lignin of bioethanol production. In our pretreatment process of bioethanol production, soda-anthraquinone (AQ) cooking was applied to remove lignin from softwood chips. Soda-AQ lignin was recovered as precipitate by acidifying the black liquor. Five kinds of soda-AQ lignin were isolated by selecting the pH value of the precipitation. Each of the isolated soda-AQ lignins was used in the mortar fluidity test as concrete admixture. With the exception of the soda-AQ lignin at higher pH (pH 10.5) precipitation, the isolated lignin gave about two times' higher mortar flow values than that of the widely used commercial lignosulfonate admixture. Size exclusion chromatography (SEC) data showed that the isolated lignin at higher pH value gave higher molecular weight. Functional group chemical analysis suggested that the isolated lignin of lower molecular weight had a higher phenolic hydroxyl group and higher alpha-carbonyl group content.
机译：我们试图建立一种新的方法来生产由生物乙醇生产副产物木质素制备的混凝土化学外加剂。在我们生产生物乙醇的预处理过程中，使用苏打蒽醌（AQ）蒸煮来去除软木片中的木质素。通过酸化黑液以沉淀形式回收苏打-AQ木质素。通过选择沉淀的pH值可分离出5种苏打-AQ木质素。每种分离的苏打-AQ木质素均用作砂浆流动性测试的混凝土外加剂。除了在较高pH（pH 10.5）沉淀下的苏打AQ木质素外，分离的木质素的灰浆流动值比广泛使用的商品木质素磺酸盐混合物高约两倍。尺寸排阻色谱（SEC）数据表明，分离的木质素在较高的pH值下具有较高的分子量。官能团化学分析表明，分离出的较低分子量的木质素具有较高的酚羟基和较高的α-羰基含量。

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