Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
10396525 | Bioresource Technology | 2005 | 8 Pages |
Abstract
Fractionation of wheat straw was investigated using an atmospheric acetic acid process. Under the typical conditions of 90% (v/v) aqueous AcOH, 4% H2SO4 (w/w, on straw), ratio of liquor to straw (L/S) 10 (v/w), pulping temperature 105 °C, and pulping time 3 h, wheat straw was fractionated to pulp (cellulose), lignin and monosaccharides mainly from hemicellulose with yields of approximately 50%, 15% and 35%, respectively. Acetic acid pulp from the straw had an acceptable strength for paper and could be bleached to a high brightness over 85% with a short bleaching sequence. Acetic acid pulp was also a potential feedstock for fuels and chemicals. The acetic acid process separated pentose and hexose in wheat straw to a large extent. Most of the pentose (xylan) was dissolved, whereas the hexose (glucan) remained in the pulp. Approximately 30% of carbohydrates in wheat straw were hydrolyzed to monosaccharides during acetic acid pulping, of which xylose accounted for 70% and glucose for 12%. The acetic acid lignin from wheat straw showed relatively lower molecular weight and fusibility, which made the lignin a promising raw material for many products, such as adhesive and molded products.
Related Topics
Physical Sciences and Engineering
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Process Chemistry and Technology
Authors
Xuejun Pan, Yoshihiro Sano,