Process for recovering acrylonitrile or methacrylonitrile

Details Process for recovering acrylonitrile or methacrylonitrile Process for recovering acrylonitrile or methacrylonitrile

2007-07-31

2007-07-31

Richter, Johann (Department: 1624)

Organic compounds -- part of the class 532-570 series

Organic compounds

Nitriles

Reexamination Certificate

active

10736387

ABSTRACT:
A process for the recovery of acrylonitrile or methacrylonitrile from an aqueous solution comprising subjecting the said solution to a water extractive distillation by feeding the solution to a distillation column and performing said extractive distillation and using solvent water introduced at the top of said column, removing a first overhead vapor stream of acrylonitrile or methacrylonitrile with some water from the top of the column, and a first liquid stream containing water and impurities from the bottom of the column, the contents of said column maintained at a substantially neutral pH by adding a sufficient amount of at least one alkaline compound selected from ammonium carbonate, ammonium bicarbonate, ammonium carbamate, and alkylene diamines to the overhead decanter and/or to the solvent water.

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Abstract JP 71013726B; Derwent; Acrylonitrile Separation From Propylene-Ammoxidation Mixture.

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