Process for the preparation of alkylene glycol

Details Process for the preparation of alkylene glycol Process for the preparation of alkylene glycol

2008-11-12

2011-11-22

Witherspoon, Sikarl (Department: 1621)

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

Organic compounds

Oxygen containing

Reexamination Certificate

active

08063256

ABSTRACT:
The invention provides a process for the preparation of an alkylene glycol from an alkene. The gas composition from an alkylene oxide reactor is contacted with lean absorbent in an alkylene oxide absorber in the presence of one or more catalysts that promote carboxylation. The lean absorbent comprises at least 50 wt % alkylene carbonate and less than 10 wt % water and is supplied to the alkylene oxide absorber at a temperature greater than 60° C. Alkylene oxide reacts with carbon dioxide in the absorber, forming alkylene carbonate, and fat absorbent comprising alkylene carbonate is withdrawn from the absorber. A portion of the fat absorbent is supplied to one or more hydrolysis reactors, wherein alkylene carbonate reacts with water in the presence of one or more hydrolysis catalysts. The product stream from the hydrolysis reactor is dehydrated and purified.

REFERENCES:
patent: 5218135 (1993-06-01), Buysch et al.
patent: 024628 (1981-03-01), None
patent: 776890 (1997-06-01), None
patent: 2107712 (1983-05-01), None

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