PROPERTY ENHANCEMENT OF KRAFT-BASED DISSOLVING PULP BY COMBINING PULP FRACTIONATION AND CELLULASE TREATMENT
A narrow molecular weight distribution(MWD)and high reactivity are highly desired to obtain a high-quality dissolving pulp.Cellulase treatment can improve the properties(e.g.,reactivity,MWD)of kraft based dissolving pulp; however,the conventional single-stage cellulase treatment of whole pulp led to inhomogeneous results due to the preferable adsorption of cellulase onto the short fibers/fines.In this study,a sequential process consisting of pulp fractionation,followed by cellulase treatment of each fraction,aiming to improve the MWD and reactivity of a prehydrolysis kraft(PHK)pulp,was investigated.Three pulp fractions,namely long-fiber fraction(LF),mid-fiber fraction(MF)and short-fiber fraction(SF),were obtained from a PHK sample.The results showed that the SF had the lowest viscosity,highest accessibility and cellulase adsorption,while the opposite was true for the LF.At a given viscosity level,the newly proposed sequential process led to a lower PDI(3.71 vs 4.98)and a higher Fock reactivity(85.6%vs 76.3%)in comparison to the conventional single-stage cellulase treatment on the whole pulp.
Chao Duan Yanling Zhang Yongjian Xua Yonghao Ni
College of Bioresources Chemical and Materials Engineering,Shannxi University of Science and Technol College of Bioresources Chemical and Materials Engineering,Shannxi University of Science and Technol Department of Chemical Engineering,Limerick Pulp and Paper Centre,University of New Brunswick,Freder
国际会议
第五届制浆造纸新技术国际研讨会(ISETPP)暨第三届国际造纸与环境学术大会(IPEC)
广州
英文
1-8
2016-11-07（万方平台首次上网日期，不代表论文的发表时间）