High quality phenol rectification with energy recovery
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United States of America Patent
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Jul 21, 1992
Grant Date -
N/A
app pub date -
Sep 23, 1991
filing date -
Sep 23, 1991
priority date (Note) -
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Abstract
The process for rectification of phenol prepared from crude phenol being the product of decomposition of cumene hydroperoxide and having previously been distilled to remove large portions of acetone, cumene and alpha methylstyrene which includes: feeding the column overhead vapors to a condenser, thereby condensing a major portion of the overhead vapors; withdrawing a small portion of the overhead vapors from the condenser while still in a vapor state, the small portion being relatively enriched in lights and laden with light acids; returning the condensate from the condenser to the phenol distillation column as reflux; and withdrawing product phenol from at least one-theoretical stage below the top of the phenol distillation column, the product phenol having improved clarity when dispersed in water, clarity being at least 93 percent light transmission as measured by an electrophotometer in a water light test. It is preferred that the condenser in step (c) is a steam generating condenser, thereby condensing a major portion of the vapors while vaporizing water circulating through the steam generating condenser to produce steam.
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