微波预处理对桉木化机浆性能的影响  

Effect of Microwave Pretreatment on Properties of Eucalyptus Chemical Mechanical Pulp

作　　者：魏录录 邓拥军[1] 韩善明[1] 李红斌[1] 梁龙[1] 房桂干[1,2,3] WEI Lulu;DENG Yongjun;HAN Shanming;LI Hongbin;LIANG Long;FANG Guigan(Institute of Chemical Industry of Forest Products,CAF/National Engineering Lab.for Biomass Chemical Utilization/Key andOpen Lab.of Forest Chemical Engineering,SFA/Key Lab.of Biomass Energy and Material,Jiangsu Province,Nanjing 210042,China;Research Institute of Forestry New Technology,CAF,Beijing 100091,China;Jiangsu Co-Innovation Center of Efficient Processing and Utilization of ForestResources,Nanjing Forestry University,Nanjing 210037,China)

机构地区：[1]中国林业科学研究院林产化学工业研究所生物质化学利用国家工程实验室国家林业局林产化学工程重点开放性实验室江苏省生物质能源与材料重点实验室,江苏南京210042 [2]中国林业科学研究院林业新技术所,北京100091 [3]南京林业大学江苏省林业资源高效加工利用协同创新中心,江苏南京210037

出　　处：《林产化学与工业》2019年第1期95-100,共6页Chemistry and Industry of Forest Products

基　　金：国家重点研发计划项目资助(2017YFD0601005)

摘　　要：通过微波、水浴两种加热方式下浸渍木片吸液量的比较,探究了微波对桉木渗透性的影响,结果显示:在其它浸渍条件(NaOH质量分数4%,木片质量分数20%)相同的情况下,木片浸渍时,经微波加热后其吸液量较水浴加热显著提高,微波处理5 min即可达到水浴处理45 min的吸液量,大大提高了浸渍效率。将微波用于化学机械法制浆的预浸渍阶段,经微波处理所得纸浆二段漂白白度最高可达68.9%(ISO),较汽蒸保温提高3～6个百分点;在加拿大游离度为305 mL时,微波处理浆的抗张指数可达19 N·m/g,撕裂指数可达2.15 mN·m^2/g,耐破指数达0.8 kPa·m^2/g,分别比汽蒸处理样高3 N·m/g、0.2 mN·m^2/g和0.1 kPa·m^2/g。The effects of microwave on the permeability of eucalyptus were studied by comparing the liquid absorption of wood chips under microwave with that under water bath.Under the same immersion conditions(NaOH 4%and mass fraction of wood chips 20%),the absorbed liquid quality of the microwave treated wood chips was significantly higher than that of the water bath.Microwave treatment for 5 minutes could reach the same absorbed liquid quality of 45 minutes in the water bath treatment,greatly improving the impregnation efficiency of wood chips.Then,microwave was used in the pre-impregnation of chemical mechanical pulping.The whiteness of the second stage bleaching pulp obtained by microwave impregnation could reach up to 68.9%(ISO),which was 3-6 percentage points higher than that of samples obtained by steaming impregnation.When the freeness of Canada was 305 mL,the tensile strength index could reach 19 N·m/g,the tear index could reach 2.15 mN·m^2/g,and the bursting index could reach 0.8 kPa·m^2/g.Furthermore,the tensile strength index was increased by 3 N·m/g on average,and the tear index was increased by about 0.2 mN·m^2/g,while the bursting index was increased by about 0.1 kPa·m^2/g.

关 键 词：微波 桉木 化学机械浆 浸渍 

分 类 号：TQ35[化学工程]