Method for producing propylene oxide

Details Method for producing propylene oxide Method for producing propylene oxide

1999-10-08

2001-04-03

Lambkin, Deborah C. (Department: 1626)

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

Organic compounds

Heterocyclic carbon compounds containing a hetero ring...

Reexamination Certificate

active

06211388

ABSTRACT:

BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a method for producing propylene oxide. More particularly, the present invention relates to a method for producing propylene oxide by reacting propylene with ethylbenzene hydroperoxide to obtain propylene oxide in high yield and high selectivity.
2. Description of the Related Art
It is known that propylene oxide can be produced by reacting propylene with ethylbenzene hydroperoxide. For example, U.S. Pat. No. 4,367,342 discloses a method using a titanium supported silica catalyst. However, it is not necessarily to produce propylene oxide in high yield and high selectivity in the conventional methods.
SUMMARY OF THE INVENTION
Under these circumstances, an object of the present invention is to provide a method for producing propylene oxide by reacting propylene with ethylbenzene hydroperoxide to obtain propylene oxide in high yield and high selectivity.
Namely, the present invention relates to a method for producing propylene oxide by reacting propylene with ethylbenzene hydroperoxide, wherein said reaction is conducted in the presence of a catalyst comprising a titanium-containing silicon oxide and satisfying all of the following conditions (1) to (5):
(1): There is at least one peak showing a interplanar spacing (d) larger than 18Å in X-ray diffraction.
(2): An average pore size is 10 Å or more.
(3): A pore size of 90% or more of the total pore volume is 5 to 200 Å.
(4): A specific pore volume is 0.2cm
3
/g or more.
(5): A quaternary ammonium ion represented by the following general formula (I) is used as a template and then said template is removed by calcination operation;
[NR
1
R
2
R
3
R
4
]
+
  (I)
(wherein, R
1
represents a linear or branched hydrocarbon chain having 2 to 36 carbon atoms, and R
2
to R
4
represent an alkyl group having 1 to 6 carbon atoms.).


REFERENCES:
patent: 4367342 (1983-01-01), Wulff et al.
patent: 5783167 (1998-07-01), Corma Canos et al.
patent: 6011162 (2000-01-01), Han et al.
patent: 0 655 278 (1995-05-01), None
patent: 7-300312 (1995-11-01), None

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