Method for producing propylene oxide

Details Method for producing propylene oxide Method for producing propylene oxide

2005-04-19

2005-04-19

Trinh, Ba K. (Department: 1625)

Organic compounds -- part of the class 532-570 series

Organic compounds

Heterocyclic carbon compounds containing a hetero ring...

C549S523000

Reexamination Certificate

active

06881853

ABSTRACT:
A process for preparing propylene oxide comprises at least the following steps:(a) propene is reacted with a hydroperoxide in a solvent in the presence of a zeolite catalyst to give a mixture (M0), where the mixture (M0) comprises propylene oxide, solvent, unreacted propene, unreacted hydroperoxide and oxygen,(b) the propylene oxide is separated from the mixture (M0) so as to give a mixture (M1) which comprises unreacted propene and oxygen,(c) the mixture (M1) is brought into contact with a liquid medium comprising at least a solvent to give the mixtures (M2) and (M3), where the mixture (M3) comprises part of the unreacted propene and oxygen and the mixture (M2) comprises solvent and residual propene, and the mixture (M3) which has been separated off and comprises unreacted propene and oxygen has a ratio of oxygen to propene such that the mixture (M3) is not ignitable, and the mixture (M2) is fed to at least one reaction of propene with hydroperoxide.

REFERENCES:
patent: 196 23 608 (1997-12-01), None
patent: 196 23 611 (1997-12-01), None
patent: 0 719 768 (1995-12-01), None

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