Process for metathesis of olefins in the presence of a stabilizing agent of the catalyst
AssigneeInstitut Francais du Petrole
InventorsDominique Commereuc, Paul Mikitenko
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Abstract
Catalytic process for metathesis of olefins in the presence of a catalyst and a stabilizing agent that is injected into the reaction medium. Application in particular to rebalancing between one another the light olefins that are obtained from steam cracking or catalytic cracking (FCC), such as ethylene, propylene, butenes or pentenes.
Claims20
Process for metathesis of olefins in the presence of a catalyst and a stabilizing agent that is injected into the reaction medium to reduce the deactivation of the catalyst:
Process for metathesis of olefins according to one of the preceding claims, wherein the stabilizing agent of the catalyst corresponds to general formula (RO)qAIR′r, in which R is a hydrocarbyl radical that is selected from the group that is formed by the alkyl, cycloalkyl, alkenyl, aryl, substituted aryl or cycloalkyl radicals, a hydrocarbyl radical of 1 to 40 carbon atoms, whereby this radical can be substituted by at least one alkoxy group or at least one halogen, and R′ is selected from the group that is formed by the methyl, ethyl, isobutyl radicals, whereby the radicals contain 1 to 20 carbon atoms and whereby the radicals contain 1 to 6 carbon atoms.
Process for metathesis of the olefins according to one of the preceding claims, wherein the stabilizing agent corresponds to general formula (RO)qAIR′r, in which R is a hydrocarbyl radical that is selected from the group that is formed by the aryl or substituted aryl radicals.
Process for metathesis of the olefins according to one of the preceding claims, wherein the stabilizing agent is selected from the group that is formed by bis-(di-t-butyl-2,6-methyl-4-phenoxy)-isobutylaluminum, bis-(di-t-butyl-2,6-methyl-4-phenoxy)-ethyl-aluminum, bis-(di-t-butyl-2,6-methyl-4-phenoxy)-methyl-aluminum.
Process according to one of the preceding claims, wherein the process is carried out with a fixed-bed catalyst.
Process for metathesis of olefins according to one of the preceding claims, wherein the stabilizing agent of the catalyst is mixed with the olefinic feedstock.
Process for metathesis of the olefins according to one of the preceding claims, wherein the catalyst contains at least one element that is selected from the group that is formed by molybdenum, tungsten, rhenium.
Process for metathesis of olefins according to one of the preceding claims, wherein the catalyst contains rhenium.
Process for metathesis of olefins according to one of the preceding claims, wherein the catalyst comprises a porous mineral substrate, 0.01 to 20% by weight of rhenium in oxide form, and 0.01 to 10% by weight of aluminum that is introduced in the form of a promoter aluminum compound of general formula (RO)qAIR′r, in which R is a hydrocarbyl radical that contains 1 to 40 carbon atoms, R′ is an alkyl radical that contains 1 to 20 carbon atoms, q and r are equal to 1 or 2 such that the sum of q+r is equal to 3.
Process for metathesis of olefins according to one of the preceding claims, wherein a feedstock that consists of ethylene and a butene-2-rich C4 fraction is brought into contact with the catalyst to produce propylene.
Process for metathesis of olefins according to one of the preceding claims, wherein a feedstock that consists of ethylene and a C5 fraction that is enriched with pentene-2 and methyl-2-butene-2 is brought into contact with the catalyst to produce propylene, isobutene and n-butenes.
Process for metathesis of olefins according to one of the preceding claims, wherein a feedstock that consists of propylene and a C5 fraction that is enriched with pentene-2 and methyl-2-butene-2 is brought into contact with the catalyst to produce isobutene and n-butenes.
Process for metathesis of olefins according to one of the preceding claims, wherein it operates at a temperature of between −20 and 200° C. and under a pressure of 0.01 to 10 MPa.
Process for metathesis of olefins according to one of the preceding claims, wherein 0.01 to 20% by weight of stabilizing agent (counted relative to the flow that enters the reactor) is added during the reaction.
Dependencies are inferred from the claim text.