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首页> 外文期刊>ACS Sustainable Chemistry & Engineering >Pilot-Scale Twin Screw Extrusion and Chemical Pretreatment as an Energy-Efficient Method for the Production of Nanofibrillated Cellulose at High Solid Content
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Pilot-Scale Twin Screw Extrusion and Chemical Pretreatment as an Energy-Efficient Method for the Production of Nanofibrillated Cellulose at High Solid Content

机译：试验规模双螺杆挤出和化学预处理作为高固含量下生产纳米纤化纤维素的节能方法

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Production of nanofibrillated cellulose (CNF) has gained increasing attention during the last decades with its recent industrialization, but such a process consumes still too high of an amount of energy. Here, cellulose nanofibrils at high solid content (20-25 wt %) and consuming 60% less energy compared to conventional processes were produced from enzymatic and TEMPO-oxidized cellulose fibers thanks to a twin screw extruder equipped with kneading disks and fully flighted conveying screws. The morphology and properties of the produced CNF were characterized using optical microscopy, atomic force microscopy (AFM), mechanical properties, and light transmittance. CNF with a width in the range of 20-30 nm and mechanical properties close to those obtained with commercial CNF (Young's modulus around 15 GPa) were produced. However, results from the degree of polymerization and crystallinity showed that twin screw extrusion (TSE) degrades the fibers as far as the supermasscolloider grinder is concerned. TSE appears as a new mechanical treatment that allows producing CNF at high solid contents and with low energy demand, which is a real asset for nanocellulose industrialization.
机译：在过去几十年中，纳米纤化纤维素（CNF）的生产在最近的产业化期间增加了关注，但这种过程仍然消耗过高的能量。这里，通过配备有捏合盘的双螺杆挤出机和完全飞行的输送螺钉，通过酶促和凝固法产生高固体含量（20-25wt％）的纤维素纳米纤维和消耗与常规方法的能量减少60％的能量。 。使用光学显微镜，原子力显微镜（AFM），机械性能和透光率的表征产生的CNF的形态和性质。产生宽度在20-30nm的范围内的CNF和靠近用商业CNF获得的机械性能（杨氏模量约为15GPa）。然而，从聚合程度和结晶度的结果表明，只要超微asscolloider磨床，双螺杆挤出（TSE）就会降低纤维。 TSE表现为一种新的机械处理，允许在高固体内容物和低能量需求下生产CNF，这是纳米纤维素工业化的实际资产。

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