Pulping of Oak Wood Using New Cooking Agents,NaOH-Urea
As an alternative method to solve air pollution problem and difficulty of pulp bleaching of kraft pulping process,NaOH-Urea pulping was applied.The properties of NaOH-Urea pulp were compared to those of NaOH and kraft pulps.Addition of urea in low alkali charges retarded delignification rate compared to NaOH pulping.But,in high alkali application,delignification was significantly enhanced not from the addition of urea but from the high alkalinity.It was disclosed that urea did not participate on delignifieation reaction by the experiment using lignin model compound.Compared to paper strengths at the same level of sheet density,NaOH-Urea pulp gave as almost same breaking length and tensile index as those of kraft pulp.Especially tensile energy absorption and burst index were higher than those of kraft pulp.It is believed that,during pulping,the formation of cellulose carbamate would play a main role to enchance the paper strength.
kraft pulping NaOH-Urea pulping delignification cellulose carbamate
NAM-SEOK CHO SOO-JEONG SHIN YUJI MATSUMOTO
Wood and Paper Science,Chungbuk National University,Cheongju 361-763,Republic of Korea Graduate School of Agricultural and Life Sciences,University of Tokyo,Tokyo 113-8657,Japan
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
290-294
2008-05-14（万方平台首次上网日期，不代表论文的发表时间）