International Journal of Materials Chemistry and Physics
Articles Information
International Journal of Materials Chemistry and Physics, Vol.1, No.3, Dec. 2015, Pub. Date: Dec. 6, 2015
Production of Dissolving Cellulose from Rice Straw in Vietnam by Pre-hydrolysis Kraft Pulping
Pages: 359-365 Views: 2497 Downloads: 2270
Authors
[01] Le Quang Dien, Department of Cellulose and Paper Technology, School of Chemical Engineering, Hanoi University of Science and Technology, Hanoi, Vietnam.
[02] Thai Dinh Cuong, Department of Cellulose and Paper Technology, School of Chemical Engineering, Hanoi University of Science and Technology, Hanoi, Vietnam.
[03] Phan Huy Hoang, Department of Cellulose and Paper Technology, School of Chemical Engineering, Hanoi University of Science and Technology, Hanoi, Vietnam.
[04] Doan Thai Hoa, Department of Cellulose and Paper Technology, School of Chemical Engineering, Hanoi University of Science and Technology, Hanoi, Vietnam.
[05] Luu Trung Thanh, Faculty of Paper Technology, Vocational College of Paper Technology and Electro-Mechanics, Phu Ninh District, Phu Tho Province, Vietnam.
Abstract
Two-stage treatment of rice straw was used for preparation of cellulosic pulp containing high content of alpha cellulose, which can be used for production of dissolving cellulose. First, rice straw was pre-hydrolyzed by sulphuric acid solution under the conditions of liquor-to rice straw ratio of 8:1 (ml/g), temperature of about 100°C in 40-45 min. reaction time. Then, pre-hydrolyzed rice straw was treated by Kraft pulping process using sodium hydroxide solution combined with sodium sulphide, with active alkaline dosage of 6.5% (w/w), at temperature of 95-100°C for 95-100 min. After hydrolysis stage, the yield of reducing sugar of 15.2-15.4% (w/w) over dry starting material was obtained. Reducing sugar hydrolysate was analyzed by HPLC showing that the reducing sugars consist of 96% of arabinose and 4% of glucose, which could be converted to bio-ethanol or furfural. The yield of cellulosic pulp of 36.3% (w/w) was achieved in Kraft pulping process which contains 78.7% alpha cellulose. Cellulosic pulp that was obtained after Kraft pulping was then treated by ECF bleaching and sodium hydroxide purification. This stage resulted in yield of 26.4% over dry rice straw with whiteness of 88% ISO and alpha-cellulose content of 86.8%. Moreover, the changes of fibre morphology after treatment of rice straw were revealed by the microscopic observations performed by Scanning Electron Microscope (SEM).
Keywords
Rice Straw, Acid Hydrolysis, Kraft Pulping, Dissolving Cellulose, Fibre
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