【摘要】 对沸石分子筛、天然沸石、造纸厂废渣(木屑和蔗髓)吸附制浆废气中的甲醇进行初步研究,探讨吸附法处理制浆厂废气的可行性.研究吸附温度、吸附时间、甲醇浓度对ZSM-5疏水分子筛、5A分子筛和天然斜发沸石吸附甲醇的影响,探讨不同水分含量的木屑和蔗髓吸附废气中甲醇的效果.研究结果表明:ZSM-5分子筛对甲醇的吸附量最大,5A分子筛次之,天然斜发沸石最小;该3种无机吸附材料对甲醇的饱和吸附量均随吸附温度的降低而增大,随气相甲醇浓度升高而增大,但温度越高达到饱和吸附所用时间越短,40℃时ZSM-5分子筛、5A分子筛和斜发沸石的饱和吸附量分别为15.00mg/g、4.90,mg/g和2.68,mg/g.水分含量影响木屑和蔗髓吸附甲醇的性能,水分含量越高,达到吸附饱和用时越长,饱和吸附量越大;实验条件下,水分含量为59.89%,的松木木屑、55.29%,的桉木木屑和54.82%,的蔗髓分别在吸附12h、10h和5h左右达到饱和,饱和吸附量分别为16.30mg/g、12.84mg/g和13.56mg/g.造纸厂的木屑和蔗髓等废渣可先用来吸附制浆废气,然后再送废渣炉进行燃烧处理.更多还原

【Abstract】 The feasibility of using adsorption to get rid of methanol in the waste gas of pulp mills has been explored,and zeolite molecular sieve,natural zeolite,residues of pulp mills(such as sawdust and bagasse pith)were used as adsorbents in this research.Influencing factors such as temperature,time and methanol concentration on the adsorption of methanol with ZSM-5 hydrophobic molecular sieve,5A molecular sieve and natural clinoptilolite were studied,and then the adsorbing performance of sawdust and bagasse pith with different moisture content was investigated.The results indicate that ZSM-5 hydrophobic molecular sieve has the best absorption property and 5A molecular sieve is the next in performance,while natural clinoptilolite is the least effective.The three inorganic materials’ adsorption quantity at equilibrium increased with the decrease of temperature and the increase of methanol concentration,and the adsorption equilibrium time decreased with the increase of temperature.The adsorption quantity at equilibrium of ZSM-5 hydrophobic molecular sieve,5A molecular sieve and natural clinoptilolite at 40℃ were 15.00mg/g,4.90mg/g and 2.68mg/g,respectively.Moisture content also affects the adsorpting performance of the residues.The equilibrium time and adsorption capacity increase with the rise of moisture content in laboratory conditions.It took pine sawdust(moisture content was 59.89%),eucalyptus sawdust(55.29%,)and bagasse pith(54.82%)12h,10h and 5h to reach adsorption equilibrium,and their saturated adsorption of methanol was 16.30mg/g,12.84mg/g,13.56mg/g,respectively.Therefore,the residues(i.e.sawdust,bagasse pith)can be used to adsorb waste gas generated during pulping,before they are burnt in the boiler.更多还原