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US 9,809,513 B2Granted
Olefin conversion process
AssigneeLummus Technology Inc.
InventorsSukwon Choi, Bala Ramachandran
Life of this patent
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Abstract
Processes for the production of olefins are disclosed, which may include: contacting a hydrocarbon mixture comprising linear butenes with an isomerization catalyst to form an isomerization product comprising 2-butenes and 1-butenes; contacting the isomerization product with a first metathesis catalyst to form a first metathesis product comprising 2-pentene and propylene, as well as any unreacted C4 olefins, and byproducts ethylene and 3-hexene; and fractionating the first metathesis product to form a C3− fraction and a C5 fraction comprising 2-pentene. The 2-pentene may then be advantageously used to produce high purity 1-butene, 3-hexene, 1-hexene, propylene, or other desired products.
Claims19
A process for the production of olefins, the process comprising:
- (a) contacting a hydrocarbon mixture comprising linear butenes with an isomerization catalyst to form an isomerization product comprising 2-butenes and 1-butenes;
- (b) contacting the isomerization product with a first metathesis catalyst to form a first metathesis product comprising 2-pentene and propylene, as well as any unreacted butenes, and byproducts ethylene and 3-hexene;
- (c) fractionating the first metathesis product to form a C3− fraction comprising propylene and ethylene and a C5 fraction comprising 2-pentene;
- and
- recycling the C3− fraction to step (a) or step (b).
2 more elements
A process for the production of olefins, the process comprising:
- feeding propylene and a mixed C4-olefin stream comprising a mixture of 1-butene and 2-butene to an isomerization/metathesis reactor including a first reaction zone comprising an isomerization catalyst and a second reaction zone comprising a first metathesis catalyst;
- contacting the propylene and mixed C4-olefin stream with the isomerization catalyst in the first reaction zone to form an isomerization product comprising 2-butene and 1-butene;
- contacting the isomerization product with the first metathesis catalyst in the second reaction zone to form a first metathesis product comprising 2-pentene, propylene, and byproducts ethylene and 3-hexene;
- feeding the first metathesis product to a fractionation system;
- fractionating the first metathesis product in the fractionation system to form at least one C3− fraction comprising propylene and ethylene and a C5 fraction comprising 2-pentene.
2 more elements
A process for the production of olefins, the process comprising:
- feeding a mixed C4-olefin stream comprising a mixture of 1-butene and 2-butene to an isomerization/metathesis reactor including a first reaction zone comprising an isomerization catalyst and a second reaction zone comprising a first metathesis catalyst;
- contacting the mixed C4-olefin stream with the isomerization catalyst in the first reaction zone to form an isomerization product comprising 2-butene and 1-butene;
- contacting the isomerization product with the first metathesis catalyst in the second reaction zone to form a first metathesis product comprising 2-pentene, propylene, and byproducts ethylene and 3-hexene;
- feeding the first metathesis product to a fractionation system;
- fractionating the first metathesis product in the fractionation system to form at least one C3− fraction comprising propylene and ethylene and a C5 fraction comprising 2-pentene;
- feeding ethylene and the C5 fraction to a metathesis reactor and contacting the ethylene and C5 fraction with a second metathesis catalyst, which may be the same or different than the first metathesis catalyst, to convert at least a portion of the ethylene and 2-pentene to propylene and 1-butene and recovering a second metathesis product comprising propylene and 1-butene;
- fractionating the second metathesis product to recover a propylene fraction and a 1-butene fraction;
- and
- feeding at least a portion of the propylene fraction to the isomerization/metathesis reactor.
6 more elements
A process for the production of olefins, the process comprising:
- feeding a mixed C4-olefin stream comprising a mixture of 1-butene and 2-butene to an isomerization/metathesis reactor including a first reaction zone comprising an isomerization catalyst and a second reaction zone comprising a first metathesis catalyst;
- contacting the mixed C4-olefin stream with the isomerization catalyst in the first reaction zone to form an isomerization product comprising 2-butene and 1-butene;
- contacting the isomerization product with the first metathesis catalyst in the second reaction zone to form a first metathesis product comprising 2-pentene, propylene, and byproducts ethylene and 3-hexene;
- feeding the first metathesis product to a fractionation system;
- fractionating the first metathesis product in the fractionation system to form at least one C3− fraction comprising propylene and ethylene and a C5 fraction comprising 2-pentene;
- recycling the C3− fraction to the isomerization/metathesis reactor;
- feeding the C5 fraction to a metathesis reactor and contacting, in the absence of ethylene, the C5 fraction with a second metathesis catalyst, which may be the same or different than the first metathesis catalyst, to convert at least a portion of the 2-pentene to 2-butene and 3-hexane and recovering a second metathesis product comprising 2-butene and 3-hexene;
- and
- fractionating the second metathesis product to recover a 2-butene fraction and a 3-hexene fraction.
6 more elements
A process for the production of olefins, the process comprising:
- feeding a mixed C4-olefin stream comprising a mixture of 1-butene and 2-butene to an isomerization/metathesis reactor including a first reaction zone comprising an isomerization catalyst and a second reaction zone comprising a first metathesis catalyst;
- contacting the mixed C4-olefin stream with the isomerization catalyst in the first reaction zone to form an isomerization product comprising 2-butene and 1-butene;
- contacting the isomerization product with the first metathesis catalyst in the second reaction zone to form a first metathesis product comprising 2-pentene, propylene, and byproducts ethylene and 3-hexene;
- feeding the first metathesis product to a fractionation system;
- fractionating the first metathesis product in the fractionation system to form an ethylene fraction, a propylene fraction, a C4 fraction and a C5+ fraction comprising 2-pentene and 3-hexene;
- feeding ethylene and the C5+ fraction to a metathesis reactor and contacting the ethylene and C5+ fraction with a second metathesis catalyst, which may be the same or different than the first metathesis catalyst, to convert at least a portion of the ethylene and 2-pentene to propylene and 1-butene and to convert at least a portion of the 3-hexene and ethylene to 1-butene and recovering a second metathesis product comprising propylene and 1-butene;
- feeding the second metathesis product to the fractionation system;
- and
- feeding the propylene fraction to the isomerization/metathesis reactor.
6 more elements
Dependencies are inferred from the claim text.