Stabilization of mixtures of maleic anhydride and acrylic acid during distillation
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United States of America Patent
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Jun 7, 1994
Grant Date -
N/A
app pub date -
Nov 9, 1992
filing date -
Nov 9, 1992
priority date (Note) -
Expired
status (Latency Note)
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Abstract
In the production of maleic anhydride, a crude maleic anhydride is produced which contains acrylic acid and other by-products. The crude maleic anhydride is dissolved in a solvent and the acrylic acid is distilled off. To avoid the polymerization of the acrylic acid, an inhibitor of phenothiazine is added to the distillation process.
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