Pan Xuejun, Sano Yoshihiro
Institute of Material Science and Chemical Engineering, Tianjin University of Science and Technology, 1038 Dagu Nanlu, Tianjin 300222, China.
Bioresour Technol. 2005 Jul;96(11):1256-63. doi: 10.1016/j.biortech.2004.10.018. Epub 2004 Dec 19.
Fractionation of wheat straw was investigated using an atmospheric acetic acid process. Under the typical conditions of 90% (v/v) aqueous AcOH, 4% H(2)SO(4) (w/w, on straw), ratio of liquor to straw (L/S) 10 (v/w), pulping temperature 105 degrees C, and pulping time 3h, 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.
采用常压乙酸法对麦草进行分级处理。在90%（v/v）的乙酸水溶液、4%硫酸（w/w，基于麦草）、液比（L/S）10（v/w）、制浆温度105℃和制浆时间3小时的典型条件下，麦草被分级为纸浆（纤维素）、木质素和主要来自半纤维素的单糖，产率分别约为50%、15%和35%。麦草制得的乙酸纸浆具有可接受的纸张强度，并且通过短漂白流程可漂白至85%以上的高亮度。乙酸纸浆也是燃料和化学品的潜在原料。乙酸法在很大程度上分离了麦草中的戊糖和己糖。大部分戊糖（木聚糖）溶解，而己糖（葡聚糖）保留在纸浆中。在乙酸制浆过程中，麦草中约30%的碳水化合物水解为单糖，其中木糖占70%，葡萄糖占12%。麦草制得的乙酸木质素显示出相对较低的分子量和可熔性，这使得该木质素成为许多产品（如粘合剂和模塑产品）的有前景的原料。
