改性Beta分子筛催化环己酮肟液相贝克曼重排制备己内酰胺  

Preparation of Caprolactam by Liquid Phase Beckmann Rearrangement of Cyclohexanone Oxime Catalyzed by Modified Beta Molecular Sieves

作　　者：禹保卫 胡红勤 彭伟 陶茂林 张川川 YU Baowei;HU Hongqin;PENG Wei;TAO Maolin;ZHANG Chuanchuan(China Pingmei Shenma Group Nylon Technology Co.,Ltd.,Pingdingshan 476000,China)

机构地区：[1]中国平煤神马集团尼龙科技有限公司,河南平顶山476000

出　　处：《河南化工》2024年第9期18-21,共4页Henan Chemical Industry

摘　　要：通过离子调控制备了改性Beta分子筛,用于催化环己酮肟液相贝克曼重排制备己内酰胺。采用XRD、SEM、N_(2)物理吸脱附及NH_(3)-TPD对催化剂结构及酸性位进行了表征分析,对催化剂活性进行了探究。结果表明,硅硼比为15的B-Beta-15催化剂表现出了最优的催化性能。在催化剂浓度8%,n(苯甲腈)∶n(环己酮肟)=2,反应温度130℃,反应时间为120 min条件下,环己酮肟转化率可达95.7%,己内酰胺选择性可达99.2%。Modified Beta molecular sieves catalysts are prepared by ion exchange for the preparation of caprolactam by liquid-phase Beckmann rearrangement of cyclohexanone oxime.The structure and acid sites of the catalyst are characterized and analyzed using XRD,SEM,N_(2) physical adsorption-desorption,and NH_(3)-TPD.The reaction activity are investigated.The results show that the B-Beta-15 catalyst with a silicon-boron ratio of 15 exhibited the best catalytic performance.Under the conditions of catalyst dosage of 8%,n(benzonitrile):n(cyclohexanone oxime)=2,temperature 130℃,and time 120 min,the conversion rate of cyclohexanone oxime reaches 95.7%,and the selectivity of caprolactam reaches 99.2%.

关 键 词：环己酮肟 己内酰胺 贝克曼重排 分子筛 催化 

分 类 号：TQ426.94[化学工程]