The Release Mechanism of Anionic Trash during Old Newspaper Pulping
Some dissolved substances(anionic trash)such as pectic acids,lignin-like substances,released during the recycling of American 8＃ old newspaper were studied systematically in this paper.The release mechanism of the anionic trash was studied and the DS(Dissolved Substances)was characterized by GC(Gas Chromatography)both qualitatively and quantitatively.During the process of pulping,with the increase of NaOH,H2O2 dosages and pulping time,both the cationic demand and conductivity of DS increased,together with an increase of the absorbance at 280 nm.The carbohydrates were characterized by GC and the results showed that the total amount of carbohydrates increased,especially xylose and galacturonic acid.The main carbohydrates released during pulping increased.Nine of the carbohydrate components which were determined were: xyiose,mannose,galacturonic acid,glucose,galactose,arabinose,4-O-methyl glucuronic acid,rhamnose,glucuronic acid,with xylose being the most.With no addition of hydrogen peroxide( only at a pure alkaline condition),the release of carbohydrates increased from 16.22 mg/L to 32.18 mg/L.With the addition of hydrogen peroxide,the release of carbohydrates was 43.77 mg/L.During the process of pulping,the effect of sodium hydroxide on the release of carbohydrates was more pronounced than that from hydrogen peroxide.Increasing the time of pulping further promoted the release of carbohydrates.
old newspaper DS anionic trashes polygalacturonic acids pulping GC
MOU HONG-YAN QIN MENG-HUA ZHAN HUAI-YU XU CHUNLIN XU QINGHUA
Shandong Key Laboratory of Pulp and Paper Engineering,Shandong Institute of Light Industry,Jinan,250 Shandong Key Laboratory of Pulp and Paper Engineering,Shandong Institute of Light Industry,Jinan,250 State Key Laboratory of Pulp and Paper Engineering,South China University of Technology,Guangzhou,51 Abo Akademi University of Finland
国际会议
第二届国际造纸与环境学术会议(The Second International Papermaking & Environment Conference)
天津
英文
539-542
2008-05-14（万方平台首次上网日期，不代表论文的发表时间）