Method for simultaneous recovery of pure benzene and pure toluene
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United States of America Patent
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Apr 21, 1992
Grant Date -
N/A
app pub date -
Dec 5, 1990
filing date -
Dec 23, 1989
priority date (Note) -
Expired
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Abstract
A simultaneous recovery of pure benzene and pure toluene is performed by extractive distillation with N-formylmorpholine and/or other N-substituted morpholines whose substituents contain not more than seven C-atoms as a solvent. From the entry product by predistillation, a benzene fraction boiling in the region between 75.degree. and 85.degree. C. and a toluene fraction boiling in the region between 99.degree. and 111.degree. C. is separated. The benzene fraction is supplied in the lower part, and the toluene fraction is supplied in the upper part of the extractive distillation column separated by a chimney plate into two parts.
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