A process for producing purified propylene oxide comprising:
- first to sixth steps below, and
- using heat of reaction generated in the first and/or second steps as
a heat source for rectification in the fifth step and/or a heat source for rectification
in the sixth step:
- first step: a step of obtaining cumene hydroperoxide trough oxidation
of cumene,
- second step: a step of obtaining propylene oxide and cumyl alcohol by
reacting cumene hydroperoxide with propylene in the presence of an epoxidation catalyst,
- third step: a step of separating into a fraction (2) containing crude
propylene oxide and a fraction (3) containing crude propylene by subjecting an
outlet liquid (1) of the second step to rectification,
- fourth step: a step of obtaining a fraction (4) containing crude propylene
oxide and a fraction (6) containing cumyl alcohol by subjecting the fraction (2)
to rectification,
- fifth step: a step of obtaining a fraction (7) containing purified propylene
oxide by subjecting the fraction (4) to rectification, and
- sixth step: a step of obtaining a fraction (5) containing purified propylene
by subjecting the fraction (3) to rectification.
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