Olefin conversion process
AssigneeLummus Technology Inc.
InventorsSukwon Choi, Bala Ramachandran
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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.
Claims13
A system for the production of olefins, the system comprising:
- an isomerization/metathesis reaction system for:
- contacting a hydrocarbon mixture comprising linear butenes with an isomerization catalyst to form an isomerization product comprising 2-butenes and 1-butenes;
- and
- 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;
- a fractionation system for fractionating the first metathesis product to form an ethylene fraction, a propylene fraction, a C4 fraction and a C5 fraction comprising 2-pentene as essentially the only C5 olefin;
- a flow conduit for feeding at least a portion of the propylene fraction to the isomerization/metathesis reaction system;
- and
- a metathesis reactor for contacting ethylene and 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 and ethylene to propylene and 1-butene and form a second metathesis product.
A system for the production of olefins, the system comprising:
- an isomerization/metathesis reactor including an inlet, for receiving a mixed C4-olefin stream comprising a mixture of 1-butene and 2-butene, and including a first reaction zone comprising an isomerization catalyst and a second reaction zone comprising a first metathesis catalyst for:
- 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;
- a fractionation system for fractionating the first metathesis product to form at least one C3-fraction and a C5 fraction comprising 2-pentene;
- a metathesis reactor for contacting ethylene and the 2-pentene in 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 ethylene and 2-pentene to propylene and 1-butene and recovering a second metathesis product;
- a second fractionation system for fractionating the second metathesis product to recover a propylene fraction and a 1-butene fraction;
- and
- a flow conduit for feeding at least a portion of the propylene fraction to the isomerization/metathesis reactor.
A system for the production of olefins, the system comprising:
- an isomerization/metathesis reactor including an inlet, for receiving a mixed C4-olefin stream comprising a mixture of 1-butene and 2-butene, and including a first reaction zone comprising an isomerization catalyst and a second reaction zone comprising a first metathesis catalyst for:
- 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;
- a fractionation system for fractionating the first metathesis product to form an ethylene fraction, a propylene fraction, a C4 fraction and a C5+ fraction comprising 2-pentene and 3-hexene;
- a metathesis reactor for contacting ethylene and 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 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;
- a flow conduit for feeding the second metathesis product to the fractionation system;
- and
- a flow conduit for feeding the propylene fraction to the isomerization/metathesis reactor.
Dependencies are inferred from the claim text.