Distillation: processes – separatory – With disparate physical separation – Utilizing liquid-liquid extracting of distillation product
Reexamination Certificate
2001-09-21
2002-12-31
Manoharan, Virginia (Department: 1764)
Distillation: processes, separatory
With disparate physical separation
Utilizing liquid-liquid extracting of distillation product
C203S068000, C203S070000, C203S074000, C203S076000, C203S079000, C549S538000, C549S541000, C568S913000
Reexamination Certificate
active
06500311
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to the separation of propylene oxide and methanol by a liquid/liquid extraction process.
2. Prior Art Description
The separation or removal of methanol from propylene oxide by conventional distillation processes is difficult by reason of the low relative volatility of propylene oxide with respect to methane at higher concentrations such as concentrations above 95 wt. % or so.
Technology has been developed for the production of propylene oxide by oxidative procedures which include the use of a methanol solvent during the oxidation reaction. Illustrative of patents relating to this technology are U.S. Pat. Nos. 4,824,976, 4,833,260, 5,252,758 and the like.
Reaction mixtures produced by this technology comprise the product propylene oxide and the methanol solvent and it is important that the propylene oxide and methanol be separated as conveniently and economically as possible.
BRIEF DESCRIPTION
In accordance with the present invention, a propylene oxide and methanol solution is subjected to a liquid/liquid extraction using water and a hydrocarbon such as n-octane in order to separate the propylene oxide and methanol.
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patent: 6024840 (2000-02-01), Rueter
Arco Chemical Technology L.P.
Long William C.
Manoharan Virginia
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