Organic compounds -- part of the class 532-570 series – Organic compounds – Oxygen containing
Reexamination Certificate
2006-07-11
2006-07-11
Keys, Rosalynd (Department: 1621)
Organic compounds -- part of the class 532-570 series
Organic compounds
Oxygen containing
Reexamination Certificate
active
07074968
ABSTRACT:
The invention is a continuous process for the preparation of polytrimethylene ether glycol from 1,3-propanediol reactant. In addition, the invention is directed to a continuous multi-stage process comprising reacting at least one reactant in a liquid phase in an up-flow column reactor, and forming a gas or vapor phase by-product wherein the gas or vapor phase by-product is continuously removed at the top and at least one intermediate stage.
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Manzer Leo E.
Marchildon Ernest Keith Andrew
Ng Howard Chung-Ho
Sunkara Hari Babu
E. I. du Pont de Nemours and Company
Keys Rosalynd
Kuller Mark D.
Lerman Bart E.
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