Purification of propylene oxide

Details Purification of propylene oxide Purification of propylene oxide

2005-06-14

2005-06-14

Trinh, Ba K. (Department: 1625)

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

Organic compounds

Heterocyclic carbon compounds containing a hetero ring...

C549S512000

Reexamination Certificate

active

06906209

ABSTRACT:
A process for purifying propylene oxide containing an unacceptable quantity of a poly (propylene oxide) polymer contaminant having a number average molecular weight of at least 50,000 and precursors having a number average molecular weight below 50,000. The process comprises contacting the propylene oxide with a sorbent selected from activated carbon, charcoal, and attapulgite for a time and under conditions sufficient to reduce the amount of the contaminant to acceptable levels, and thereafter recovering the purified propylene oxide product, wherein the propylene oxide is contacted with the sorbent at a temperature below 10° C.

REFERENCES:
patent: 4692535 (1987-09-01), Larson et al.
patent: 5235075 (1993-08-01), Bachman et al.
patent: 5493035 (1996-02-01), Soltani-Ahmadi et al.
patent: WO 00/55148 (2000-09-01), None

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