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US 6,670,518 B2Granted
Olefin recovery in a polyolefin production process
AssigneeExxonMobil Chemical Patents Inc.
InventorRonald G. Searle
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Abstract
Disclosed is a method of recovering olefin from purge streams in a polyolefin production process. The method includes reacting a purge stream containing olefin and impurities with water in the presence of a hydrating catalyst to produce an alcohol containing stream. The impurities can include methane, ethane, butylenes, and hydrogen. The alcohol containing stream can be used to produce olefins in an oxygenate to olefin production process.
Claims6
A method of purifying an olefin containing purge stream, comprising:
- reacting a purge stream withdrawn from a polyolefin production unit, the purge stream containing olefin and impurities selected from the group consisting of hydrogen, methane, ethane, and butylene with water in the presence of a hydrating catalyst to produce an alcohol containing stream;
- and
- contacting alcohol from the alcohol containing stream with an olefin forming catalyst to form an olefin product stream comprising ethylene and/or propylene.
Dependencies are inferred from the claim text.