Process for preparing purified conjugated diene
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United States of America Patent
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May 28, 2002
Grant Date -
May 2, 2002
app pub date -
Aug 24, 1999
filing date -
Mar 11, 1997
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Abstract
Processes for producing a purified conjugated diene comprise feeding a petroleum fraction containing the conjugated diene to an extractive distillation column, feeding an extraction solvent to the extractive distillation column, and extractive-distilling the conjugated diene from the petroleum fraction containing the conjugated diene in the extractive distillation column. The extraction solvent comprises an amide compound, and a heterocyclic aldehyde, aromatic nitro compound or aromatic aldehyde is contained in the extraction solvent within a range of 0.01 to 10 wt. % based on the weight of the extractive solvent. An oxygen concentration in a gas phase of a distillate discharged from the top of the extraction distillation column is controlled to 10 ppm or lower. The processes further comprise recovering the extraction solvent, purifying the recovered extraction solvent to adjust the content of water in the recovered extraction solvent to within a range of 50 to 500 ppm based on the weight of the extraction solvent, and recovering the isolated conjugated diene. The extraction solvent fed to the extractive distillation column is the purified recovered extraction solvent.
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