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Cellulose interactions with CO2 in NaOH(aq): The (un)expected coagulation creates potential in cellulose technology
Carbohydrate Polymers ( IF 10.7 ) Pub Date : 2022-06-26 , DOI: 10.1016/j.carbpol.2022.119771
Aleksandra M Kozlowski 1 , Merima Hasani 2
Affiliation  

Upon the search for a suitable processing method for cellulose, the dissolution in NaOH(aq) presents a real green potential, including its ability to sorb environmental CO2(g) affecting dissolution. Here, CO2(g) was delivered in a controlled way to the cellulose/NaOH(aq) system during the in-situ analysis with FTIR, pH and temperature meters, resulting in efficient coagulation of cellulose. Surprisingly, the coagulation occurred with a minimal loss of alkalinity. This was considered an effect of a specific interaction between the dissolved polymer and gas, resulting in the introduction of carbonate species, highly influential in the coagulation process. The process repeated at 25 °C and 5 °C suggested a strong influence of temperature. The conversion routes of the CO2(g) coagulant were also related to the dissolved state of the polymer. The recovered cellulose appeared competitive with EtOH recovery in terms of structure. The presented finding put a perspective on the utilisation of both the coagulation process and final materials in cellulose technology.



中文翻译:

NaOH(aq) 中纤维素与 CO2 的相互作用:(未)预期的凝结为纤维素技术创造了潜力

在寻找合适的纤维素加工方法后,在 NaOH(aq) 中的溶解呈现出真正的绿色潜力,包括其吸收环境 CO 2 (g) 影响溶解的能力。在这里,CO 2 (g)在原位过程中以受控方式输送到纤维素/NaOH(aq) 系统使用 FTIR、pH 和温度计进行分析,从而实现纤维素的有效凝结。令人惊讶的是,凝结发生时碱度损失最小。这被认为是溶解的聚合物和气体之间的特定相互作用的影响,导致碳酸盐物质的引入,对凝结过程有很大影响。在 25 °C 和 5 °C 下重复该过程表明温度的影响很大。CO 2 (g) 混凝剂的转化途径也与聚合物的溶解状态有关。就结构而言,回收的纤维素似乎与 EtOH 回收具有竞争力。所提出的发现为纤维素技术中凝结过程和最终材料的利用提供了一个视角。

更新日期:2022-06-30
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