工业碱木素热化学转化制备酚类化学品  

Preparation of phenols using thermal chemical conversion of industrial kraft lignin

作　　者：隋鑫金[1] 武书彬[1,2] 

机构地区：[1]华南理工大学制浆造纸工程国家重点实验室,广东广州510640 [2]中国科学院可再生能源与天然气水合物重点实验室,广东广州510640

出　　处：《化工学报》2011年第6期1763-1769,共7页CIESC Journal

基　　金：国家重点基础研究发展计划项目(2007CB210201);国家高技术研究发展计划项目(2007AA05Z456);中国科学院可再生能源与天然气水合物重点实验室资助项目(0807K1)~~

摘　　要：引言 工业碱木素是碱法制浆过程中产生的重要副产物之一,其排放污染问题越来越受到关注,目前工业处理方法只是将其浓缩燃烧以回收能源和残碱。Industrial kraft lignin,a waste produced by kraft-pulping process in the pulp and paper industry,was usually burnt off.Lignin is of aromatic and aliphatic characters and could be used to produce some chemicals.In this paper,phenols were prepared using kraft lignin as material,FeS as catalyst and glycerol as solvent,and the feasibility and technological parameters of chemical conversion of industrial kraft lignin were studied.The results from response surface methodology（RSM）experiments showed that the optimal reaction conditions were catalyst dosage 4%,heating time 1 h,heating temperature 270℃,liquor-solid ratio 5 ml·g-1.Total yield of phenols,obtained from GC-MS quantitative analysis,was up to 55.18%.The main phenols were 2-methoxy-phenol,4-methyl-2-methoxy-phenol and 2,6-dimethoxy-phenol.The test results also indicated that hydrogen free radical provided by hydrogen-donor solvent such as phenol and tetralin could effectively promote the thermal conversion of industrial kraft lignin.In summary,this chemical conversion method of industrial kraft lignin to phenols was feasible and effective.The results of kinetic study showed that the thermal conversion followed first order reaction kinetics,and reaction rate constant was 0.0212 min-1 and activation energy was 35.7251 kJ·mol-1.

关 键 词：碱木素 转化 酚类 制备 

分 类 号：TK6[动力工程及工程热物理—生物能]