Abstract:
A process for the continuous preparation of an oxime from cyclohexanone and an aqueous buffered solution of a hydroxylammonium salt together with free phosphoric acid, phosphates, nitrates, and optionally sulphates all in controlled amounts and without the use of an organic solvent is disclosed. The resulting aqueous reaction mixture contains a manageable amount of unreacted cyclohexanone which is subsequently recovered and recirculated.
Abstract:
Epsilon -CAPROLACTAM IS RECOVERED FROM A Beckmann rearrangement mixture of the lactam and aqueous sulfuric acid by simultaneously neutralizing the rearrangement mixture with ammonia at a pressure of 1-5 atmospheres and crystallizing out ammonium sulfate, the heat liberated by the neutralization reaction is removed from the system by evaporating a portion of the water from the solution. At the conditions employed hydrolysis of the lactam is substantially reduced if not entirely avoided.