UNSATURATED MONONITRILE PRODUCTION PROCESS (OPTIONS) Russian patent published in 2005 - IPC

FIELD: industrial organic synthesis.

SUBSTANCE: process, in which, in particular, acrylonitrile or methacrylonitrile are obtained, comprises reacting hydrocarbon selected from propane, propylene, and isobutylene with ammonia and oxygen source in presence of catalyst in reaction zone at elevated temperature. Reactor effluent containing unsaturated mononitrile is transferred into first column to be cooled therein with the aid of the first water stream. Cooled effluent containing unsaturated mononitrile is transferred into second column wherein it comes into contact with second water stream to absorb unsaturated mononitrile. Unsaturated mononitrile-containing second column effluent is fed into first distillation column to separate crude unsaturated mononitrile from the second water stream and routed to the second distillation column to remove at least some impurities from crude mononitrile, which is transferred into third distillation column to be further purified. Water in the form of steam and/or distilled water is added in amounts 100 to 2000 ppm to side-cut distillate containing purified mononitrile or to bottom stream coming out of the third distillation column. At least part of the latter is recycled into lower section of third distillation column or directly into column below side-cut distillate withdrawal point.

EFFECT: enhanced process efficiency.

16 cl, 1 dwg