THE INFLUENCE OF PROPERTIES IN CELLULOSE PULPS ON THE REACTIVITY IN VISCOSE MANUFACTURING
This paper describes properties in cellulose pulps to address the increased quality demands on pulps for viscose production. Several grades of cellulose pulps were selected to investigate their chemical reactivity based on pulping process, original wood type and intrinsic viscosity. In total, six sulfite pulps and four sulfate pulps were chosen, of which all but one sulfate pulp were of dissolving grade. Many physical and chemical properties of the pulps were tested. The influence of these properties on xanthation and viscose manufacturing as well as their correlation to each of the three selection criteria was investigated by the use of multivariate data analyses. Two methods were used to describe cellulose reactivity: a laboratory scale viscose test method for cellulose reactivity (Fock) and a filter clogging test for viscose dope. The analysis shows that sulfite pulps, from both wood types, are strongly correlated to the variables Fock reactivity, pore size and concentration of extractives. Sulfate pulps, however, are separated into two groups, hardwood and softwood. Hardwood sulfate pulps are strongly described by the variables permeability, content of hemicelluloses and filter clogging value. Softwood sulfate pulps, on the other hand, are described by variables such as alpha cellulose content, R10 and R18. Partial least square regression showed that Fock reactivity is influenced by the following cellulose pulp properties, in order of importance: absorption rate with caustic, pore area, permeability and pore diameter. The main property affecting the filter clogging value of the viscose dope is pulp permeability, followed by pore diameter, content of hemicelluloses, R18 and pore area.
cellulose pulp viscose manufacturing reactivity properties
Peter Strunk Bertil Eliasson Curt Hagglund Roland Agnemo
Department of Chemistry, Ume(a) University, SE-901 87 Ume(a), Sweden MoRe Research (O)rnsk(o)ldsvik AB, SE-89180 (O)rnsk(o)ldsvik, Sweden Domlnnova, Domsj(o) Fabriker AB, SE-89186 (O)rnsk(o)ldsvik, Sweden
国际会议
16th International Symposium on Wood,Fiber and Pulping Chemistry(第十六届木材、纤维及制浆化学国际会议)
天津
英文
377-383
2011-06-08（万方平台首次上网日期，不代表论文的发表时间）