Process for the purification of crude propene oxide

Details Process for the purification of crude propene oxide Process for the purification of crude propene oxide

2006-05-23

2006-05-23

Tsang, Cecilia J. (Department: 1625)

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

Organic compounds

Heterocyclic carbon compounds containing a hetero ring...

C549S524000, C549S529000, C549S531000, C203S057000, C203S064000

Reexamination Certificate

active

07049450

ABSTRACT:
A process for the purification of a crude propene oxide containing methanol and acetaldehyde by a continuously operated extractive distillation using an extraction solvent lowering the volatility of methanol and feeding a compound containing an unsubstituted NH2group capable of reacting with acetaldehyde to a distillation column at a point above the feeding point of the crude propene oxide to give a purified propene oxide containing less than 100 ppm methanol and less than 100 ppm acetaldehyde. There is also disclosed a process for the catalytic epoxidation of propene that includes this purification stage.

REFERENCES:
patent: 2622060 (1952-12-01), Robeson et al.
patent: 5116465 (1992-05-01), Yeakey et al.
patent: 0 004 019 (1979-09-01), None
patent: 0 100 119 (1984-02-01), None
patent: 1 009 746 (1999-03-01), None

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