Katalytisches Verfahren zur Lactamherstellung

1,211,156. Production of lactams. FARBENFABRIKEN BAYER A.G. 16 July, 1968 [9 Aug., 1967], No. 33780/68. Heading C2C. [Also in Division B1] A process for the production of lactams by rearranging cyclic ketoximes in the vapour phase in the presence of water vapour and of a catalyst consisting of boron oxide on a support said catalyst being periodically regenerated in the fluidized state when having lost its activity, comprises adding to the catalyst fluidized by means of an inert gas, an orthoboric acid alkyl ester or a finely-ground powder of boron oxide or boric acid with a particle size of not more than 100Á, said adding being effected at temperatures of from 200-800‹ C. either before or after the conventional reactivation treatment carried out with gases containing oxygen. Examples use boric acid tri-isopropyl ester, boric acid tri-n-butyl ester and a boric acid trimethyl ester and methanol azeotropic mixture.