微波液化木材动力学研究及产物分析  

Kinetics of Wood Liquefaction Using Microwave Heating and Products Analysis

作　　者：冯国东[1,2,3,4] 周永红[1,2,3,4,5] 郭小昕[1,2,3,4] 胡立红[1,2,3,4,6] 

机构地区：[1]中国林业科学研究院林产化学工业研究所 [2]生物质化学利用国家工程实验室 [3]国家林业局林产化学工程重点开放性实验室 [4]江苏省生物质能源与材料重点实验室,江苏南京210042 [5]江苏强林生物能源有限公司,江苏溧阳213364 [6]中国林业科学研究院林业新技术研究所,北京100091

出　　处：《林产化学与工业》2010年第3期66-72,共7页Chemistry and Industry of Forest Products

基　　金："十一五"国家科技支撑计划资助(2006BAD18B10);中央级公益性科研院所基本科研业务费专项资金(CAFINT2007C14)

摘　　要：以醇解的废旧饮料瓶（聚对苯二甲酸乙二醇酯,PET）为液化剂,微波加热液化木材。探讨了反应时间和液化率的关系。实验结果显示木材液化符合二级动力学反应,活化能（Ea）为1.76×10^5J/mol,指前因子（A）0.891 e50.28（.smol）/L2。通过对液化产物进行分离分析发现,随液化时间的增加得到产物水萃取部分减少而乙酸乙酯萃取部分增加;对比分析不同时间和不同萃取剂得到的产物的GPC和HPLC-MS/MS曲线,得到木质素部分裂解产物的相对分子质量（Mr）在400~200之间,纤维素裂解产物Mr在10 000以上;有部分PET碎片和木材成分的液化产物重新聚合生成Mr在10 000以上且不溶于水的产物。液化产物的羟值、酸值、黏度都随着时间的增加而增加;对比分析各萃取部分的红外光谱图,相差不大。Wood liquefacient was carried out from alcoholysis of waste bottles（polyethylene terephthalate,PET） using microwave irradiation.The relationship between the rate of liquefaction and time was discussed.The results showed that wood liquefaction obeys the second-order kinetics.Liquefaction activation eneryy Eawas 1.76×10^5 and pre-exponetial factor A was 0.891e50.28（s·mol）/L2.Percentage content of water-solubles decreased and that of ethyl acetate-solubles increased with the increase of liquefaction time.The products of different liquefaction time and different extraction of GPC and HPLC-MS/MS analyses showed that,the relative molecular mass（Mr） of lignin pyrolysis products were 400-200.The Mr of cellulose pyrolysis products was more than 10000.The Mr of water-insoluble products from some PET debris and re-polymerization of liquefied products was more than 10000.The hydroxyl value,acid value and viscosity（25℃） of the products increased with the increase of time.The infrared spectra of each extract fraction had little difference.

关 键 词：木材液化 聚对苯二甲酸乙二醇酯(PET) 动力学 产物分析 GPC HPLC-MS/MS 

分 类 号：TQ351.0[化学工程] TQ319