Process for recovering acrylonitrile or methacrylonitrile
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United States of America Patent
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Jul 31, 2007
Grant Date -
Sep 16, 2004
app pub date -
Dec 15, 2003
filing date -
Jan 3, 2003
priority date (Note) -
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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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