This study aimed to produce high-performance dissolving pulps from corn stalks using a combination of cold caustic extraction (CCE) and deep eutectic solvent (DES) method. Results showed that CCE not only removed hemicelluloses but also altered the structure of cellulose, increasing its polymerization degree and influencing the Fock reactivity of the dissolving pulp (reduced to 10.55%). Subsequent treatment with DES effectively dissolving the remaining hemicelluloses while disrupting the cellulose crystallinity and improving the Fock reactivity of the dissolving pulp (increased to 72.14% from 10.55%). The study implied that the hydrogen bond donor in DES played a crucial role in breaking the cellulose chains and improving the reactivity of the dissolving pulp. The dissolving pulp produced from corn stalks using through the combination of CCE and DES method exhibited the cellulose content of 94.46% and the Fock reactivity of 72.14%, providing a new strategy for the high-value utilization of stover resources.
Qiuyan Chen,Xinping Wang,Hai Huang,Shilin Cao,Lihui Chen,Liulian Huang,Xiaojuan Ma
The development of effective separation of hemicelluloses from fully bleached cellulosic pulp fibers is conducive to the development and utilization of high value-added cellulose products. In this study, Turkey Red Oil (sulfonated castor oil) (TRO), a renewable source, was proposed to facilitate hemicelluloses separation from chemical pulp in cold caustic extraction (CCE). As expected, TRO application can significantly promote hemicelluloses separation in the CCE process. By contrast to the traditional CCE process, TRO/CCE could decrease the hemicelluloses content from 9.1 to 6.1%, while the hemicelluloses removal selectivity increased from 72.5 to 82.3% and efficiency, increased from 52.4 to 68.1%. Moreover, without sacrificing hemicelluloses removal, the TRO utilization can reduce the alkaline consumption and therefore preserve the cellulose I crystal from conversion to cellulose II. Additionally, the TRO/CCE procedure made the cellulose fiber more flexible and more accessible to react with CS 2 and therefore a high Fock reactivity.
危险品化学品经营许可证（带存储）