Value-added utilization of cellulose derived from paper waste: depolymerization of cellulose

Lim Hui, Yin (2014) Value-added utilization of cellulose derived from paper waste: depolymerization of cellulose. [Final Year Project Report] (Unpublished)

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Abstract

Depolymerization of cellulose is the critical step to breaking down the cellulose into different chain lengths of oligomers. Cellulose depolymerized using salt-assisted organic-acid-catalysis had been characterized as a green and cost-effective approach. The inexpensive sodium chloride (NaCl) with oxalic acid as catalyst was introduced into a reflux system to perform an acid-catalyzed depolymerization of cellulose under mild reactions conditions (105-150°C). The depolymerized cellulose was characterized using FTIR, SEM and UV-VIS spectrophotometer. The salt concentration and temperature had substantial influence on the degree of polymerization (DP) of cellulose and glucose concentration. The glucose concentration was determined by using UV-VIS spectrophotometer by the measuring absorbance at 540 nm. The measurement of specific viscosity was carried out to determine the DP of cellulose. The lower the DP of cellulose indicated the more oligomers were obtained.

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