• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Journal of Wood Chemistry and Technology >Alkaline Pre-treatment of Hardwood Chips Prior to Delignification
【24h】

Alkaline Pre-treatment of Hardwood Chips Prior to Delignification

机译：木质素碎片在脱木素之前进行碱性预处理

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Hardwood fBetula pendula,) chips were extracted having alkaline aqueous solutions with varying chemical charges (1, 2, 3, 4, 6, and 8% of NaOH on wood), treatment times (30, 60, 90, and 120 minutes), and temperatures (130°C and 15CPC). The total amount of material removed was in the range 2.1-16.5% of the original dry feedstock. This fraction was characterized in terms of carbohydrates and their degradation products (mainly aliphatic carboxylic acids together with some furanoic compounds), lignin, and extractives. Low alkali charges (1-4% of NaOH) were not sufficient to neutralize all the acids formed (mainly acetic acid from the acetyl groups of xylan). In contrast, an increase in alkali charge (6% and 8% of NaOH) more intensively facilitated the alkali-catalyzed degradation reactions of polysaccharides to various hydroxy acids, which were then typically present as one of the main constituents in the dissolved organic matter, along with other aliphatic carboxylic acids (acetic and formic acids), lignin, extractives, and carbohydrates.
机译：硬木fBetula pendula碎片是用碱性水溶液提取的，这些碱性水溶液具有不同的化学电荷（木材上分别有1、2、3、4、6和8％的NaOH），处理时间（30、60、90和120分钟），和温度（130°C和15CPC）。去除的材料总量为原始干原料的2.1-16.5％。根据碳水化合物及其降解产物（主要是脂肪族羧酸和一些呋喃化合物），木质素和提取物来表征该馏分。低碱电荷（1-4％的NaOH）不足以中和所有形成的酸（主要是来自木聚糖乙酰基的乙酸）。相比之下，碱电荷（NaOH的6％和8％）的增加会更强烈地促进多糖对各种羟基酸的碱催化降解反应，然后这些羟基酸通常作为溶解有机物中的主要成分之一存在，以及其他脂肪族羧酸（乙酸和甲酸），木质素，提取物和碳水化合物。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号