Carboxymethyl cellulose from rice stubble waste
Date
2020
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Article
Publisher
Prince of Songkla University
Journal Title
Carboxymethyl cellulose from rice stubble waste
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Abstract
Rice stubble is an agricultural waste with 30.67% yield of cellulose (90.05% _-cellulose content) to be synthesized as carboxymethyl cellulose (CMC). Hemicellulose and lignin were first removed and later rice stubble cellulose was swollen in 30% NaOH and isopropanol as a solvent. Synthesis conditions such as chloroacetic acid content (5Ð7 g in 5 g of alkali cellulose), reaction temperature (50 and 70) and time (180, 270 and 360 min) were investigated to obtain CMC from rice stubble (CMCr). The 7 g of chloroacetic acid at 50 ûC for 180 min provided the best quality of CMCr based on 5 g of rice stubble cellu-lose with degree of substitution, viscosity and purity of 0.64, 36.03 cP and 90.18%, respectively. The presence of carboxymethyl substituents was verified by Fourier transform infrared spectroscopy. CMCr showed commercially low viscosity material and possibly used as a film forming packaging material for food and pharmaceutical products. >© (Publication Year), (publisher Name). All rights reserved.
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Songklanakarin Journal of Science and Technology