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Study of steam explosion pretreatment and preservation methods of commercial cellulose
Carbohydrate Polymers ( IF 11.2 ) Pub Date : 2018-03-14 , DOI: 10.1016/j.carbpol.2018.03.021
Ana Lorenzo-Hernando , Judit Martín-Juárez , Silvia Bolado-Rodríguez

Steam explosion (150–200 °C, 5–30 min) was performed on a commercial cellulose presented in two configurations (fiberized and compact sheet) and its effect on their chemical and physical properties was studied, along with the influence of two different preservation methods (acetone drying and freezing) after pretreatment. No degradation compounds were produced during pretreatment, although solid recovery (RS) decreased with temperature from 90% to 62%. Similar particle size and surface conditions (increased porosity) were found for both types of pretreated samples despite the extremely different initial configuration. Crystallinity diminished for 150 °C samples, but 200 °C pretreatment promoted recrystallization. Pretreatment also reduced polymerization degree, although enzymatic accessibility did not improve. Both acetone and freezing processes extremely affected cellulose properties. Acetone drying counterbalanced crystallinity and enzymatic accessibility variations of pretreated samples, while decreasing polymerization degree to 302. Freezing dramatically decreased enzymatic accessibility of pretreated samples down to 15.8%.



中文翻译:

商用纤维素蒸汽爆炸预处理及保存方法的研究

对以两种形态(纤维化和致密片状)呈现的商业纤维素进行蒸汽爆炸(150–200°C,5–30分钟),研究了其对化学和物理性能的影响以及两种不同保存方法的影响。预处理后的方法(丙酮干燥和冷冻)。尽管固体回收率(RS),但在预处理过程中未产生降解化合物。)随温度从90%下降到62%。尽管两种类型的预处理样品的初始构型差异很大,但它们的粒径和表面条件(孔隙率增加)相似。150°C样品的结晶度降低,但200°C的预处理促进了重结晶。预处理也降低了聚合度,尽管酶的可及性没有改善。丙酮和冷冻过程都极大地影响了纤维素的性能。丙酮干燥平衡了预处理样品的结晶度和酶促可达性变化,同时将聚合度降低到302。冷冻大大降低了预处理样品的酶促可达性,降低到15.8%。

更新日期:2018-03-15
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