Extraction of Cellulose microfibrils from Non-wood Lignocellulosic Material Using Biorefinery Concept

Md Sarwar Jahan


The cellulose microfibrils from natural lignocellulosics are new and exciting biomaterial constituent that can provide strong reinforcement in many products, including polymer composites. In this study, the cellulose crystals were extracted from jute and bagasse fibers based on the formic acid/ peroxyformic acid/peroxide process at an atmospheric pressure, and their yields were 59.8 and 38.1%, respectively. Considering the biorefinery concept, the dissolved lignin and hemicelluloses in the processes were also isolated from the spent formic acid liquor. The results showed that the spent liquor contained 10.6 and 28.2% (on oven dried raw material) total sugars and 10.9 and 16.9% lignin for jute and bagasse fibers, respectively. The cellulose microfibrils was further prepared from the extracted cellulose based on the acid hydrolysis technique. A very high yield of cellulose microfibrils (48.0 % based on the jute raw material) was obtained from jute fibers, while only 18.2% yield was obtained from the bagasse. The acid hydrolysate of cellulose contained 5.5% and 17.7% sugars from jute and bagasse, respectively. The MCC/NCC samples obtained from the two different raw materials were characterized by means of TGA, FTIR, XRD and TEM techniques. The average diameter of the NCC was 15-40 nm. The XRD results revealed that both MCC/NCC had a high crystallinity index. The thermal stability of MCC/NCC from the jute fibers was higher than that from the bagasse.

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