Understanding the effect of depth refining on upgrading of dissolving pulp during cellulase treatment
Understanding the effect of depth refining on upgrading of dissolving pulp during cellulase treatment
复制标题
了解深度精炼对纤维素酶处理过程中溶解浆升级的影响
DOI：
10.1016/j.indcrop.2019.112032
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发表时间：
2020-02
影响因子：
5.9
通讯作者：
陈嘉川
中科院分区：
文献类型：
--
作者：
王强;付新;刘姗姗;吉兴香;王营超;贺会利;杨桂花;陈嘉川
反应性是溶解浆的一个关键参数，它决定了人造丝生产中有毒化学品（即二硫化碳）的消耗量。在本研究中，在纤维素酶处理之前进行深度精炼以升级预水解硫酸盐（PHK）纸浆。假设机械精炼不仅可以通过释放额外的羟基来提高反应性，还可以通过改善酶的可及性来提高纤维素酶的效率。结果表明，精制浆（打浆度 50°SR）的 Fock 反应活性由原来（19°SR）的 54.8% 提高到 78.0%，这主要是由分子间氢键变化引起的，并得到 FTIR 分析的支持。此外，精制纸浆（30-50°SR）的纤维素酶吸附率提高了39.7-71.2%，验证了酶促可达性的提高。因此，机械精炼和纤维素酶处理（纤维素酶用量为 0.5 mg/g 纸浆）的一体化工艺在提高反应性和降低粘度方面比对照（纤维素酶用量为 1 mg/g 纸浆）产生了更好的结果。其他纸浆特性，如纤维长度和细粉含量、保水值（WRV）、比表面积（SSA）、结晶度和形态，都支持深度精磨对纤维素酶处理过程中溶解浆活化的积极影响。
Reactivity is a critical parameter of dissolving pulp, which determines toxic chemical (i.e. carbon disulfide) consumption in rayon production. In this study, the depth refining was carried out to upgrade pre-hydrolysis kraft (PHK) pulp prior to cellulase treatment. The hypothesis is that the mechanical refining can not only increase reactivity by liberating additional hydroxyl groups, but also enhance cellulase efficiency by improving enzymatic accessibility. Results showed that the Fock reactivity of refined pulp (beating degree of 50°SR) was increased to 78.0 % from 54.8 % of the original (19°SR), which was mainly caused by inter- molecular hydrogen bond changes, supported by FTIR analysis. In addition, the cellulase adsorption ratio of refined pulp (30–50 °SR) was increased in a range of 39.7–71.2 %, which verified the improvement of enzymatic accessibility. As a result, the integrated process consisting of mechanical refining and cellulase treatment (at cellulase dosage of 0.5 mg/g pulp) yielded a much better result than the control (at cellulase dosage of 1 mg/g pulp) in terms of reactivity increase and viscosity decrease. Other pulp properties, such as fiber length and fines content, water retention value (WRV), specific surface area (SSA), crystallinity, and morphology, were all supported the positive effect of depth refining on activation of dissolving pulp during cellulase treatment.
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11.4
作者：
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作者：
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