摘要
利用NaOH在较温和的温度条件下从玉米秆原料中预提取出了半纤维素,分析了提取液中糖类组分及含量,采用NaOH-AQ法对提取过半纤维素的玉米秆进行了制浆实验,考察了预提取对制浆以及黑液中SiO2含量的影响。结果表明,玉米秆半纤维素的主要成分是木聚糖,在温度75℃,碱浓10%时,提取液中木糖总量占原料中木糖的91.8%。黑液中SiO2含量的检测结果表明玉米秆中SiO2含量较低,未经预提取原料NaOH-AQ蒸煮黑液中SiO2含量为163 mg/L,经预提取之后,相同条件下蒸煮所得黑液中SiO2含量均有不同程度的下降。在碱浓达到8%时,硅含量比未经预提取玉米秆的制浆黑液降低了79.8%。提取后原料的制浆结果表明半纤维素预提取可以显著提高纸浆的白度,降低纸浆卡伯值,但同时也会在一定程度上降低纸浆的得率和黏度。
Sodium hydroxide was used to extract hemicellulose from corn stover under mild conditions.The compositions and contents of saccharides in the extraction liquors were determined.The materials after pre-extraction were thoroughly washed and then undergone pulping with NaOH-AQ and the effects of pre-extraction on pulping and SiO2 contents in the black liquor were studied.Results showed that the main composition of corn stover hemicellulose was xylan,when the temperature was 75℃ and the charge of alkali was 10%（based on o.d.matter）,the extraction ratio of xylose was as high as 91.8% based on the total xylose content in the raw material.The determination of the silicon content in the black liquor showed that corn stover had low silicon content and its concentration was 163 mg/L in the black liquors from corn stover without pre-extraction.The silicon content decreased to different levels after pre-extraction.When the pre-extraction dosage of alkali was 8%,silicon content decreased by 79.8%.Results of pulping showed that pulp from pre-extracted corn stover had a higher brightness and lower Kappa number compared with the one without pre-extraction,while the yield and viscosity were decreased to some extent.
出处
《中国造纸学报》
CAS
CSCD
北大核心
2010年第1期1-4,共4页
Transactions of China Pulp and Paper
基金
国家"973计划"资助课题(2007CB210201)
关键词
半纤维素
预提取
木糖
硅含量
hemicellulose
pre-extraction
xylan
silicon content
