Kinetics of S-1 catalyzed vapor phase Beckmann rearrangement of cyclohexanone oxime to caprolactam

doi:10.3969/j.issn.0438-1157.2013.03.019

Abstract

Abstract: Caprolactam,the intermediate for the production of Nylon-6,is mainly produced through sulfuric acid catalyzed liquid phase Beckmann rearrangement of cyclohexanone oxime.This process has several disadvantages,such as the corrosion of reactors and by-production of a large amount of ammonium sulfate.These shortcomings can be prevented by vapor phase Beckmann rearrangement.In this work,the kinetics of vapor phase Beckmann rearrangement of cyclohexanone oxime to caprolactam was studied by both experiments and modeling.The results showed that the changes of catalyst activity with online reaction time could be correlated with the catalyst deactivation model developed by Wojciechowski,from which the kinetic equation and the corresponding parameters of the reaction were obtained.The results could be used to calculate deactivation rates at any online reaction time or catalyst life at the permissible lower conversion.

Key words: cyclohexanone oxime, Beckmann rearrangement, caprolactam, S-1

摘要： 目前尼龙6生产中主要采用发烟硫酸催化环己酮肟液相Beckmann重排制己内酰胺,副产大量硫酸铵,而且存在设备腐蚀等问题。采用气相重排法可以克服上述缺点。本工作在以前得到的优化反应条件下,根据实验并采用催化剂失活的Wojciechowski模型获得了S-1催化环己酮肟气相Beckmann重排制己内酰胺反应动力学方程及参数。该模型将催化剂的活性与在线反应时间相关联,进而可以计算任何在线反应时间时催化剂的失活速率,或者根据要求的转化率最低允许值计算催化剂能在线反应的时间。

关键词: 环己酮肟, Beckmann重排, 己内酰胺, S-1

CLC Number:

TQ013.2

JIN Xing, MENG Fanhui, WANG Shuhai, WANG Yaquan. Kinetics of S-1 catalyzed vapor phase Beckmann rearrangement of cyclohexanone oxime to caprolactam[J]. CIESC Journal, 2013, 64(3): 924-930.

金星, 孟凡会, 王书海, 王亚权. S-1催化环己酮肟气相Beckmann重排反应动力学[J]. 化工学报, 2013, 64(3): 924-930.

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