Process for the purification of olefinically unsaturated nitriles
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United States of America Patent
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Jul 4, 2006
Grant Date -
Aug 25, 2005
app pub date -
Jan 6, 2005
filing date -
Jan 9, 2004
priority date (Note) -
Expired
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Abstract
A process for the recovery and purification of olefinically unsaturated nitrites from a process stream produced by the ammoxidation of a hydrocarbon feedstock comprising contacting the process stream comprising olefinically unsaturated nitrile with an aqueous quench liquid in a quench apparatus to produce a gaseous quench effluent comprising olefinically unsaturated nitrile; contacting the gaseous quench effluent with a liquid comprising water in an absorber apparatus to form an aqueous mixture comprising absorbed olefinically unsaturated nitrile; withdrawing from the absorber apparatus a side-draw stream comprising water and a bottoms stream comprising olefinically unsaturated nitrile; introducing the bottoms stream to a first distillation column where the bottoms stream is distilled in an extractive distillation to form a top fraction comprising olefinically unsaturated nitrile, and directing the side-draw stream comprising water to the upper portion of the first distillation column to assist with the extractive distillation of the olefinically unsaturated nitrile in the first distillation column.
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