UNSATURATED MONONITRILE PRODUCTION PROCESS Russian patent published in 2004 - IPC

FIELD: industrial organic synthesis.

SUBSTANCE: invention relates to production of unsaturated mononitriles such as acrylonitrile and methacrylonitrile comprising following stages: reaction of olefin (propylene or isobutylene) with ammonia and oxygen in presence of catalyst; routing reactor-leaving unsaturated mononitrile-containing stream to cooling column wherein it comes into contact with first water stream and is cooled therefrom; routing mononitrile-containing cooled stream to absorption column wherein it comes into contact with at least second water stream to isolate and remove unsaturated mononitrile as bottom stream from absorption column; routing unsaturated mononitrile-containing bottom stream to regeneration column wherein regeneration and mononitrile purification take place; treating at least one used water stream prior to being recycled into used stream to lower pH, in particular to lower amount of trace oxidant impurities present in recycling aqueous acrylonitrile stream.

EFFECT: reduced amount of oxidants in recycling aqueous solutions.

8 cl, 1 dwg, 3 ex