Establishment of a precise control model is conducive to efficient extraction of heteropolysaccharides (Hete) from lignocellulose biomass during alkali treatment process. Thus, this work focused on studying the dissolution behaviors of heteropolysaccharides from hemp stalk under different extraction conditions and developing a precise model to describe its solid–liquid mass transfer process. The results showed that under the optimal liquid to material ratio condition, alkali concentration and extraction time were the main factors affecting the extraction efficiency, followed by temperature and hydrogen peroxide dosage. Meanwhile, the influence of the flow state of lye and the particle size of hemp stalk cannot be also ignored. The established mass transfer models showed that the diffusion activation energy of heteropolysaccharides during laminar- and turbulent-flow states were 1.1044 and 1.1015 kJ/mol, respectively, which totally proved that the dissolution of heteropolysaccharide under alkaline condition was a solid–liquid diffusion-dominated mass transfer process. The internal and external verification results showed that the correlation and robustness of laminar- and turbulent-type diffusion models were very good and suitable for controlling the dissolution of heteropolysaccharides from hemp stalk or similar plants.

中文翻译：

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大麻秆碱溶性杂多糖的固液传质特性及机理

建立精准控制模型有利于高效提取杂多糖（Hete) 来自碱处理过程中的木质纤维素生物质。因此，这项工作的重点是研究大麻茎中杂多糖在不同提取条件下的溶解行为，并开发一个精确的模型来描述其固-液传质过程。结果表明，在最佳液料比条件下，碱浓度和提取时间是影响提取效率的主要因素，其次是温度和双氧水用量。同时，碱液的流动状态和大麻秆粒径的影响也不容忽视。建立的传质模型表明杂多糖在层流和湍流状态下的扩散活化能分别为1.1044和1.1015 kJ/mol，这完全证明了杂多糖在碱性条件下的溶解是一个固-液扩散主导的传质过程。内部和外部验证结果表明，层流和湍流型扩散模型的相关性和稳健性非常好，适用于控制大麻茎或类似植物中杂多糖的溶解。