Premium
Ammoximation of Cyclohexanone over Al 2 O 3 Supported Titanium Silicates
Author(s) -
Prasad R.,
Vashisht Seema
Publication year - 1997
Publication title -
journal of chemical technology and biotechnology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.64
H-Index - 117
eISSN - 1097-4660
pISSN - 0268-2575
DOI - 10.1002/(sici)1097-4660(199703)68:3<310::aid-jctb652>3.0.co;2-k
Subject(s) - cyclohexanone oxime , cyclohexanone , catalysis , titanium , yield (engineering) , ammonia , molar ratio , ketone , chemistry , selectivity , oxime , nuclear chemistry , inorganic chemistry , materials science , organic chemistry , metallurgy
The ammoximation of cyclohexanone to cyclohexanone oxime with H 2 O 2 and NH 3 , in liquid phase, over γ‐Al 2 O 3 supported titanium silicates, is reported. The effects of temperature, reactant concentrations and support to catalyst ratio on the efficiency of the process are examined. A maximum yield of 94·48% with selectivity 98·49% for oxime could be achieved over 50 wt% γ‐Al 2 O 3 supported titanium silicates, at a cyclohexanone: NH 3 : H 2 O 2 molar ratio of 1:1·5:1, and at a temperature of 313 K. Studies suggest that in the case of a supported catalyst, the catalyst: ketone ratio is about eight times less than that needed for an unsupported catalyst. A batchwise addition of cyclohexanone and ammonia and a dropwise addition of H 2 O 2 produced the best results. A tentative mechanism for the production of oxime and by‐products is suggested. © 1997 SCI.