Effect of Ultrafiltration on the Physical and Chemical Properties of Ammonia Sulfite Pulping Black Liquor
Ultrafiltration treatment of the ammonia sulfite pulping black liquor of wheat straw and its influence on chemical structure characteristics and physical properties were studied.The results showed: after ultrafiltration the content of lignin in retentate increased by 6％ and the content of ash decreased by 6％; the molecular weight distribution of lignin in black liquor and retentate were determined by Gel Chromatography that the molecular weight of lignin in permeate mainly concentrated in the range of less than 4950 with the occupation of 82.86％,and the molecular weight of lignin in retentate was higher than that of black liquor; the amount of sulfonic,carboxyl,phenolic hydroxyl groups which are the main functional groups in the retentate was more than that in black liquor.Meanwhile,after ultrafiltration,the retentate had better performance than black liquor as surfactant,as additive in concrete and as dispersant.Compared with black liquor,its surface tension at lwt％ was 54.7 mN/m,dropped 2.2 mN/m; Clean solutions fluidity improved from 70mm to 102mm.
ultrafiltration black liquor structure performance
WANG ZHE LI ZHONG-ZHENG
Jiangsu Provincial Key Lab of Pulp and Paper Science and Technology Nanjing Forestry University,Nanjing,Jiangsu Province,210037,China
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
1075-1077
2008-05-14（万方平台首次上网日期，不代表论文的发表时间）