Process for the preparation of propanediol

Details Process for the preparation of propanediol Process for the preparation of propanediol

2005-05-24

2005-05-24

Price, Elvis O. (Department: 1621)

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

Organic compounds

Oxygen containing

C568S866000, C568S908000, C568S852000, C558S277000

Reexamination Certificate

active

06897343

ABSTRACT:
The invention relates to a process for the preparation of 1,2-propanediol from propylene oxide, which process involves contacting propylene oxide with carbon dioxide in the presence of a homogeneous phosphorus containing catalyst to obtain propylene carbonate, optionally removing at least part of the carbon dioxide, adding water and/or an alcohol to the reaction product containing propylene carbonate and phosphorus containing catalyst and contacting the mixture with a heterogeneous catalyst to obtain 1,2-propanediol in combination with dialkylcarbonate and/or carbon dioxide, and separating 1,2-propanediol from the reaction product obtained.

REFERENCES:
patent: 4508927 (1985-04-01), Bhise et al.
patent: 5847189 (1998-12-01), Tojo et al.
patent: 776890 (1997-06-01), None
patent: 02256347.2 (2002-09-01), None
patent: WO 03000641 (2003-01-01), None
patent: WO 03042141 (2003-05-01), None
patent: WO 03042152 (2003-05-01), None
Buchanan et al. (U.S. Pre-Grant Pubs. 2003/0045739 A1).

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