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US 6,646,176 B1Granted
Production of olefins
AssigneeFina Research, S.A.
InventorsJean-Pierre Dath, Luc Delorme, Jacques-François Grootjans, Xavier Vanhaeren, Walter Vermeiren
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AssigneeFina Research, S.A.
InventorsJean-Pierre Dath, Luc Delorme, Jacques-François Grootjans, Xavier Vanhaeren, Walter Vermeiren
Estimating the term…
A process for the catalytic cracking of an olefin-containing feedstock which is selective towards light olefins in the effluent, the process comprising contacting a hydrocarbon feedstock containing at least one olefin with a MFI-type crystalline silicate catalyst having a silicon/aluminum atomic ratio of at least about 180, which has been obtained by pretreating so as to increase the silicon/aluminum atomic ratio thereof by heating the catalyst in steam and de-aluminating the catalyst by treating the catalyst with a complexing agent for aluminum, at an inlet temperature of from 500 to 600° C. and at an olefin partial pressure of from 0.1 to 2 bars to produce an effluent with an olefin content of lower molecular weight than that of the feedstock.
A process for the catalytic cracking of an olefin-containing feedstock which is selective toward light olefins in the effluent, the process comprising contacting a hydrocarbon feedstock containing at least one olefin with a MFI crystalline silicate catalyst having a silicon/aluminum atomic ratio from 180 to 1000, which has been obtained by pretreating so as to increase the silicon/aluminum atomic ratio thereof by heating the catalyst in steam to reduce tetrahedral aluminum in the crystalline silicate framework to form alumina and de-aluminating the catalyst by treating the catalyst with a complexing agent for aluminum to remove aluminum from the pores of said crystalline silicate at an inlet temperature of from 500 to 600° C. and at an olefin partial pressure of from 0:1 to 2 bars to produce an effluent with an olefin content of lower molecular weight than that of the feedstock.
A process for the catalytic cracking of an olefin-containing feedstock which is selective toward light olefins in the effluent, the process comprising contacting a hydrocarbon feedstock containing at least one olefin with a MFI crystalline silicate catalyst selected from the group consisting of silicalite and ZSM-5 having a silicon/aluminum atomic ratio from 180 to 1000, which has been obtained by pretreating so as to increase the silicon/aluminum atomic ratio thereof by heating the catalyst in steam to reduce tetrahedral aluminum in the crystalline silicate framework to form alumina and de-aluminating the catalyst by treating the catalyst with a complexing agent for aluminum to remove aluminum from the pores of said crystalline silicate at an LHSV of from 10-30 hrs.−1, an inlet temperature of from 500 to 600° C., and at an olefin partial pressure of from 0:1 to 2 bars to produce an effluent with an olefin content of lower molecular weight than that of the feedstock.
Dependencies are inferred from the claim text.