Production of olefins
AssigneeFina Research, S.A.
InventorsJean-Pierre Dath, Luc Delorme, Jacques-François Grootjans, Xavier Vanhaeren, Walter Vermeiren
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Abstract
A process for the catalytic cracking of at least one olefin in an olefinic stream containing impurities, the cracking process being selective towards light olefins in the effluent, the process comprising contacting a feedstock olefinic stream containing at least one sulphur-, nitrogen- and/or oxygen-derivative impurity with a crystalline silicate catalyst of the MFI-type, the catalyst having a silicon/aluminum atomic ratio of at least about 180, to produce an effluent stream having substantially the same olefinic content by weight as, but a different olefin distribution than, the feedstock stream.
Claims21
A process for the catalytic cracking of at least one olefin in an olefinic stream containing impurities, the cracking process being selective towards light olefins in the effluent, the process comprising contacting at an inlet temperature of from 500 to 600° C. a feedstock olefinic stream containing at least 100 ppm of at least one impurity selected from the group consisting of nitrogen, sulphur and oxygen with a MFI crystalline silicate catalyst, the catalyst having been heated in steam to reduce the tetrahedral aluminum in the crystalline silicate framework and subjected to an aluminum extraction process to remove aluminum from the pores of the crystalline silicate after which the catalyst has a silicon/aluminum atomic ratio of from 180 to 1000, to produce an effluent stream having substantially the same olefinic content by weight as, but a different olefin distribution than, the feedstock contains.
A process for the catalytic cracking of at least one olefin in an olefinic stream containing dienes and impurities, including at least one impurity selected from the group consisting of nitrogen-, sulphur-, and oxygen-containing compounds, the cracking process being selective towards light olefins in the effluent, the process comprising selectively hydrogenating dienes in said stream to provide a maximum diene concentration therein of 0.1 weight percent and thereafter contacting at an inlet temperature of from 500 to 600° C. the resulting feedstock olefinic stream containing at least 100 ppm of at least one impurity selected from the group consisting of nitrogen, sulphur and oxygen with a MFI crystalline silicate catalyst, the catalyst having been heated in steam to reduce the tetrahedral aluminum in the crystalline silicate framework and subjected to an aluminum extraction process to remove aluminum from the pores of the crystalline silicate after which the catalyst has a silicon/aluminum atomic ratio of from 180 to 1000, to produce an effluent stream having substantially the same olefinic content by weight as, but a different olefin distribution than, the feedstock stream.
A process for the catalytic cracking of at least one olefin in an olefinic stream containing impurities, the cracking process being selective towards light olefins in the effluent, the process comprising contacting at an inlet temperature of from 500 to 600° C. a feedstock olefinic stream containing at least 100 ppm of at least one impurity selected from the group consisting of nitrogen, sulphur and oxygen with a MFI crystalline silicate catalyst, the catalyst having been heated in steam to reduce the tetrahedral aluminum in the crystalline silicate framework and subjected to an aluminum extraction process to remove aluminum from the pores of the crystalline silicate after which the catalyst has a silicon/aluminum atomic ratio of from 180 to 1000, to produce an effluent stream having substantially the same olefinic content by weight as, but a different olefin distribution than, the feedstock contains, wherein the olefin contents by weight of the feedstock and the effluent are within ±15% of each other.
Dependencies are inferred from the claim text.