VAPOR-PHASE REACTION OF CYCLOHEXANONE OXIME OVER BORIA MODIFIED HSZM-5 ZEOLITES

被引:47
作者
TAKAHASHI, T
UENO, K
KAI, T
机构
[1] Department of Chemical Engineering, Faculty of Engineering, Kagoshima University, Kagoshima
关键词
BECKMANN REARRANGEMENT; CYCLOHEXANONE OXIME; EPSILON-CAPROLACTAM SELECTIVITY; BORIA MODIFIED ZEOLITE;
D O I
10.1002/cjce.5450690508
中图分类号
TQ [化学工业];
学科分类号
0817 ;
摘要
The vapor phase Beckmann rearrangement of cyclohexanone oxime has been carried out over zeolites and boria modified HZSM-5 zeolites to elucidate the effects of acidity and acid strength distribution on the conversion and epsilon-caprolactam selectivity. Although epsilon-caprolactam selectivity was increased with the SiO2/Al2O3 ratio in a HZSM-5 zeolite, the highest selectivity in the study was accomplished over a boria modified HZSM-5. The selectivity was dependent on the ratio of weak acid sites to strong acid sites. The boria played an important role in controlling the acid strength distribution of the zeolites. It was found that the production of a polymer over strong acid sites caused a decrease in epsilon-caprolactam selectivity during the reaction.
引用
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页码:1096 / 1099
页数:4
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