THE KINETICS OF VAPOR-PHASE CELLULOSE FAST PYROLYSIS REACTIONS

被引:40
作者
GRAHAM, RG
BERGOUGNOU, MA
FREEL, BA
机构
[1] Ensyn Technologies Inc., Greely, Ont. K4P 1A2
[2] Faculty of Engineering Science, The University of Western Ontario, London
关键词
CELLULOSE; FAST PYROLYSIS; KINETICS; MODELING; VAPOR-PHASE;
D O I
10.1016/0961-9534(94)00045-U
中图分类号
S2 [农业工程];
学科分类号
0828 ;
摘要
Biomass fast pyrolysis reactions consist of primary activation and fragmentation reactions, followed by secondary vapour-phase cracking reactions. Kinetic data derived from in-house experiments and published literature have clearly indicated that under true fast pyrolysis conditions, the primary reaction rates exceed those of the secondary reactions by several orders of magnitude. Therefore, since the cracking reactions are rate-limiting, an estimation of the rate of conversion of biomass to secondary products is in fact an estimation of the secondary reaction rate. This paper focuses on the determination of the key kinetic parameters (rate constants, pre-exponential constant and activation energy) for the vapour-phase cracking reactions which occur during cellulose pyrolysis. The parameters were determined using a first-order kinetic model and a non-linear regression routine. The experimental work was conducted in the Ultrapyrolysis equipment at the University of Western Ontario in London, Canada.
引用
收藏
页码:33 / 47
页数:15
相关论文
共 23 条
[1]  
Graham, A characterization of the fast pyrolysis of cellulose and wood biomass, Ph.D. thesis, (1993)
[2]  
Byrne, Gardner, Holmes, The pyrolysis of cellulose and the action of flame-retardants, Journal of Applied Chemistry, 16, pp. 81-88, (1966)
[3]  
Broido, Kinetics of solid phase cellulose pyrolysis, Thermal Uses and Properties of Carbohydrates and Lignins, pp. 19-36, (1976)
[4]  
Kilzer, Broido, Speculations on the nature of cellulose pyrolysis, Pyrodynamics, 2, pp. 151-163, (1965)
[5]  
Bradbury, Sakai, Shafizadeh, A kinetic model for pyrolysis of cellulose, J. Appl. Polymer Sci., 23, pp. 3271-3280, (1979)
[6]  
Shafizadeh, Fu, Pyrolysis of cellulose, Carbohydrate Res., 29, pp. 113-122, (1973)
[7]  
Shafizadeh, Introduction to pyrolysis of biomass, Journal of Analytical and Applied Pyrolysis, 3, pp. 285-305, (1982)
[8]  
Soltes, Elder, Thermal degradation routes to chemicals from wood, 8th World Forestry Congress Proc., (1978)
[9]  
Arsenau, Competitive Reactions in the Thermal Decomposition of Cellulose, Canadian Journal of Chemistry, 49, pp. 632-638, (1971)
[10]  
Piskorz, Radlein, Scott, On the mechanism of the rapid pyrolysis of biomass, J. Anal. Appl. Pyrolysis, 9, pp. 121-137, (1986)