期刊
JOURNAL OF WOOD CHEMISTRY AND TECHNOLOGY
卷 33, 期 2, 页码 77-91出版社
TAYLOR & FRANCIS INC
DOI: 10.1080/02773813.2012.748077
关键词
Alkaline pre-treatment; birch chips; aliphatic acids; hemicelluloses; carbohydrates; lignin; extractives
资金
- Finnish Ministry of Education
Hardwood (Betula 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 degrees C and 150 degrees C). The total amount of material removed was in the range 2.116.5% 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 (14% 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.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据