A novel method for preparing microcrystalline cellulose from bleached chemical pulp using transition metal ions enhanced high temperature liquid water process. (15th March 2019)

• Record Type: Journal Article
• Authors: Yue, Xiaopeng; He, Jiachen; Xu, Yang; Yang, Miaoxiu; Xu, Yongjian
• Is Part Of: Carbohydrate polymers. Volume 208(2019)
• Page Start: 115
• Page End: 123
• Publication Date: 2019-03-15
• Subjects: High temperature liquid water (HTLW) -- Transition metal ions -- Microcrystalline cellulose (MCC) -- Reducing end groups; Polysaccharides -- Periodicals; Polysaccharides -- Periodicals; Polysaccharides -- Périodiques; Electronic journals; 547.78
• DOI: 10.1016/j.carbpol.2018.12.072
• Languages: English
• ISSNs: 0144-8617

Abstract

Highlights: A new approach for MCC preparation was established. Hemicellulose removal/amorphous cellulose degradation were synchronous. Transition metal ions were critical to remove hemicelluloses/degrade amorphous cellulose. The high carbonyl group content of prepared MCC could provide some unique applications. Abstract: A novel method for preparing microcrystalline cellulose (MCC) from bleached chemical pulp based on the transition metal ion-enhanced high temperature liquid water (HTLW) process was established in this study. Transition metal ions (Fe 3+, Cu 2+ or Cr 3+ ) were used to enhance the depolymerization effect of HTLW treatment on fibers. Hemicelluloses are selectively removed, resulting in an increase in the α-cellulose content; cellulose undergoes hydrolytic degradation, causing a significant decrease in the average degree of polymerization (DP). SEM images indicated that the as-prepared MCC had granular or rod-like shape. The repose angle results showed a desirable fluidity of obtained MCC. The copper number results showed an increase in the reducing end groups of the obtained MCC. The XRD analysis indicated that the cellulose crystallite exhibited negligible changes, and the crystallization index (CI) increased. However, a very high concentration of transition metal ions lowered the CI. The transition metal ion-enhanced HTLW treatment provides an acid free method for preparing MCC.