Method of removing dimethyl ether from an olefin stream
AssigneeExxonMobil Chemical Patents Inc.
InventorsMinquan Cheng, Jeffrey J. Phillips, Michael Peter Nicoletti, David Ritchie Lumgair, JR., John Richard Shutt, Jeffrey Alan Kabin
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Abstract
This invention is directed to a method of removing dimethyl ether from an olefin stream. The method includes distilling the olefin stream so that the dimethyl ether is separated out of the olefin stream with propane. The olefin stream can then be further distilled to provide a polymer grade ethylene stream and a polymer grade propylene stream, with each stream containing not greater than about 10 wppm dimethyl ether.
Claims45
A method of separating dimethyl ether from, an olefin stream made from an oxygenate to olefin reaction process, comprising:
- contacting oxygenate with a molecular sieve catalyst to form the olefin stream, wherein the olefin stream comprises water, propylene, propane, and dimethyl ether;
- drying the olefin stream;
- and
- distilling the dried olefin stream to separate the dimethyl ether and propane from the propylene.
A method of removing dimethyl ether from an olefin stream, comprising:
- providing an olefin stream which comprises water, propylene, propane and dimethyl ether;
- drying the olefin stream;
- distilling the dried olefin stream so as to separate out the propane and dimethyl ether from the propylene, wherein the propane and dimethyl ether stream comprises from 60 to 99.5 wt % propane and from 0.05 to 40 wt % dimethyl ether.
A method of polymerizing propylene made from an oxygenate, comprising:
- contacting the oxygenate with a molecular sieve catalyst to form an olefin stream, wherein the olefin stream comprises propylene, propane, and dimethyl ether;
- distilling the olefin stream to separate the propylene from the propane and dimethyl ether;
- and
- polymerizing the separated propylene.
A method of polymerizing ethylene and propylene, comprising:
- drying an olefin stream which comprises ethylene, propylene, propane and dimethyl ether;
- distilling the dried olefin stream to separate out an ethylene stream, a propylene stream, and a propane and dimethyl ether stream, wherein the ethylene stream and the propylene stream each contain not greater than 10 wppm dimethyl ether;
- and
- polymerizing the separated ethylene and propylene streams.
Dependencies are inferred from the claim text.