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首页> 外文期刊>Biotechnology Progress >Selectivity and Delignification Kinetics for Oxidative and Nonoxidative Lime Pretreatment of Poplar Wood, Part III: Long-Term
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Selectivity and Delignification Kinetics for Oxidative and Nonoxidative Lime Pretreatment of Poplar Wood, Part III: Long-Term

机译：杨木氧化和非氧化石灰预处理的选择性和去木质素动力学，第三部分：长期

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摘要

Lime pretreatment is an effective method for improving lignocellulose digestibility by removing lignin. For several weeks, mixtures of poplar wood, water, and calcium hydroxide (lime) were submitted to temperatures from 25 to 65° C, with and without aeration. Kinetic models for lignin and carbohydrate degradation were obtained as functions of temperature, time, and aeration using first-order kinetics in lignin and carbohydrates. Model 1 considered two reacting moieties (slow and fast), and Model 2 considered three (slow, medium, and fast). Model 1 was statistically better and was employed to determine differential and integral selectivities, which measure the ability of pretreatment to retain carbohydrates while removing lignin. During the first 2 weeks, when lignin content >0.80 gig lignin in raw bio-mass, both glucan and xylan differential and integral selectivities decreased rapidly. Afterwards, selectivities were nearly constant ranging between 0 and 3 g lignin removedlg carbohydrate degraded.
机译：石灰预处理是通过去除木质素来改善木质纤维素消化率的有效方法。在几周的时间内，白杨木，水和氢氧化钙（石灰）的混合物在有和没有通气的情况下都处于25至65°C的温度下。利用木质素和碳水化合物的一级动力学，获得了木质素和碳水化合物降解的动力学模型，该模型是温度，时间和充气的函数。模型1考虑了两个反应部分（慢和快），模型2考虑了三个反应部分（慢，中和快）。模型1在统计上更好，可用于确定微分和整体选择性，该选择性和微分测量了预处理在除去木质素的同时保留碳水化合物的能力。在最初的两周中，当原始生物质中的木质素含量> 0.80 gig时，葡聚糖和木聚糖的微分和整体选择性均迅速下降。之后，选择性几乎恒定在0至3克木质素去除的碳水化合物降解的范围内。

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