Process for Energy Recovery in Purifying Carboxylic Anhydride for Manufacturing Cellulose Esters
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United States of America Patent
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Issued Date -
Jan 15, 2015
app pub date -
Jul 11, 2013
filing date -
Jul 11, 2013
priority date (Note) -
Abandoned
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Abstract
Integration of a carboxylic anhydride purification system in the manufacturing of cellulose esters may include processes that includes distilling the crude carboxylic anhydride stream (that includes a carboxylic anhydride and a carboxylic acid) in a distillation column having an overhead or side stream comprising purified, vaporous carboxylic anhydride and a bottoms stream; heating a steam condensate stream in a steam generator to yield a low-temperature steam; and cooling at least a portion of the overhead or side stream to yield a cooled overhead or side stream. In some instances, a heat exchanger may be utilized in parallel or series with the steam generator.
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