High pressure separation of dimethyl ether from an olefin stream
AssigneeExxonMobil Chemical Patents Inc.
InventorsCor F. Van Egmond, Jeffrey L. Brinen, James R. Lattner, Michael Peter Nicoletti
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Abstract
Disclosed is a method of removing dimethyl ether from an ethylene and/or propylene containing stream. Dimethyl ether is removed at a high pressure, preferably in a distillation column. The high pressure separation has the benefit of providing a relatively low bottoms temperature separation, while allowing for recovery of a highly concentrated ethylene and/or propylene stream.
Claims85
A method of separating dimethyl ether from an olefin stream, comprising:
- providing an olefin stream containing ethylene, ethane, propylene, propane, and dimethyl ether;
- and
- separating the olefin stream into a first fraction and a second fraction at a pressure of at least 200 psig, wherein the first fraction contains at least a majority of the ethylene and propylene present in the olefin stream, and the second fraction contains at least a majority of the dimethyl ether present in the olefin stream.
A method of separating dimethyl ether from an olefin stream, comprising:
- contacting oxygenate with a molecular sieve catalyst to form an olefin stream, wherein the olefin stream contains ethylene, ethane, propylene, propane, and dimethyl ether;
- and
- separating the olefin stream into a first fraction and a second fraction at a pressure of at least 200 psig, wherein the first fraction contains at least a majority of the ethylene and propylene present in the olefin stream, and the second fraction contains at least a majority of the dimethyl ether present in the olefin stream.
A method of separating dimethyl ether from an olefin stream, comprising:
- contacting oxygenate with a molecular sieve catalyst to form an olefin stream, wherein the olefin stream contains ethylene, ethane, propylene, propane, dimethyl ether and water;
- removing water from the olefin stream so that the olefin stream contains less than 15,000 wppm water;
- and
- separating the olefin stream containing less than 15,000 wppm water into a first fraction and a second fraction at a pressure of at least 200 psig, wherein the first fraction contains at least a majority of the ethylene and propylene present in the olefin stream, and the second fraction contains at least a majority of the dimethyl ether present in the olefin stream.
A method of separating dimethyl ether from an olefin stream, comprising:
- providing an olefin stream containing ethylene, ethane, propylene, propane, and dimethyl ether;
- and
- separating the olefin stream into a first fraction containing at least a majority of the ethylene and propylene present in the olefin stream, and a second fraction containing at least a majority of the dimethyl ether present in the olefin stream, wherein the olefin stream is separated at a pressure of at least 200 psig and such that the second fraction has an average temperature of not greater than 250° F.
A method of separating dimethyl ether from an olefin stream, comprising:
- providing an olefin stream containing ethylene, ethane, propylene, propane, propadiene and dimethyl ether;
- and
- separating the olefin stream into a first fraction containing at least a majority of the ethylene and propylene present in the olefin stream, and a second fraction containing at least a majority of the dimethyl ether and propadiene present in the olefin stream, wherein the olefin stream is separated at a pressure of at least 200 psig and such that the second fraction has an average temperature of not greater than 250° F.
Dependencies are inferred from the claim text.