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US 7,396,972 B2Granted
Methanol feed for producing olefin streams
AssigneeExxonMobil Chemical Patents Inc.
InventorsCor F. Van Egmond, Michael Peter Nicoletti, Eric D. Nelson, Christopher D. W. Jenkins
Life of this patent
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Abstract
A method for producing an olefin stream is provided based on conversion of an initial natural gas stream into a synthesis gas. The resulting synthesis gas is enriched with CO2 previously separated from the natural gas stream. The synthesis gas is then used to form a methanol composition, which can then be used as feedstock for a methanol-to-olefin conversion reaction.
Claims34
A process for forming an olefin stream, the process comprising:
- (a) separating a CO2-containing stream from a first natural gas stream, the natural gas stream comprising at least 2 mol % CO2 and the CO2-containing stream comprising at least 75% CO2 by weight;
- (b) reforming a second natural gas stream to form a synthesis gas stream;
- (c) adding at least a portion of the separated CO2-containing stream into the synthesis gas stream;
- (d) contacting the synthesis gas stream with a carbon oxide conversion catalyst to form a methanol composition comprising:
- i. at least 50 wt % and less than 99.85 wt % methanol, based on total weight of the methanol composition,
- ii. greater than 10 wppm and not greater than 15 wt % ethanol, based on total weight of the methanol composition, and
- iii. greater than 10 wppm and not greater than 15 wt % acetaldehyde, based on total weight of the methanol composition;
- and
- (e) contacting the methanol composition with an olefin forming catalyst to form an olefin stream comprising greater than 65 wt % ethylene and propylene.
6 more elements
A process for forming an olefin stream, the process comprising:
- (a) separating a CO2-containing stream from a natural gas stream, the natural gas stream comprising at least 5 mol % CO2 and the CO2-containing stream comprising at least 75% CO2 by weight;
- (b) adding at least a portion of the separated CO2-containing stream into a second natural gas stream;
- (c) forming a synthesis gas stream from the second natural gas stream;
- (d) contacting the formed synthesis gas stream with a carbon oxide conversion catalyst to form a methanol composition comprising:
- i. at least 50 wt % and less than 99.85 wt % methanol, based on total weight of the methanol composition,
- ii. greater than 10 wppm and not greater than 15 wt % ethanol, based on total weight of the methanol composition, and
- iii. greater than 10 wppm and not greater than 15 wt % acetaldehyde, based on total weight of the methanol composition;
- and
- (e) contacting the methanol composition with an olefin forming catalyst to form an olefin stream comprising greater than 65 wt % ethylene and propylene.
6 more elements
Dependencies are inferred from the claim text.