Zeolite catalysis process for conversion of diene-containing olefins to aromatic hydrocarbons
First Claim
1. A process for converting lower olefinic hydrocarbon feedstock to aromatics-rich product by contacting the feedstock with acidic siliceous zeolite conversion catalyst particles at elevated temperature between about 200 degrees C. to 650 degrees C. under aromatization conditions to produce heavier hydrocarbons including aromatic hydrocarbons comprising:
- introducing lower olefinic feedstock comprising at least one C4 -C6 diene component into a bed of catalyst particles to convert feedstock to heavier hydrocarbon rich in aromatics;
separating an aromatics-rich C5+ liquid stream from fluidized bed reaction effluent;
extracting aromatics components from the liquid stream and recovering a product stream comprising at least 50 wt% C6 -C10 aromatic hydrocarbons.
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Abstract
A technique for continuous conversion of diene-containing aliphatic hydrocarbon feedstock to heavier hydrocarbon products wherein the feedstock is contacted at elevated temperature under endothermic high severity reaction conditions with a fluidized bed of acidic zeolite fine catalyst particles, comprising methods and means for:
maintaining the fluidized catalyst bed in a vertical reactor having a turbulent reaction zone by passing vapor upwardly through the reaction zone at a velocity greater than dense bed transition velocity to a turbulent regime and less than transport velocity for the average catalyst particle;
feeding a continuous stream of feedstock into the reaction zone, said feedstream comprising sufficient C3+ alkanes to require net endothermic reaction conditions;
withdrawing a portion of coked catalyst from the reaction zone, oxidatively regenerating the withdrawn catalyst, heating the catalyst substantially above process temperature in the fluidized bed reactor, and returning hot regenerated catalyst to the reaction zone at a rate to control catalyst activity and reaction temperature under conditions of reaction severity to effect feedstock conversion to an aromatics-rich hydrocarbon effluent stream; and
separating an aromatics-rich product from the fluidized bed effluent stream.
Aromatics yield is increased by recovering a recycle stream comprising C5+ aliphatic hydrocarbons from the fluidized bed effluent stream for further conversion in the fluidized bed to increase aromatics product yield.
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10 Claims
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1. A process for converting lower olefinic hydrocarbon feedstock to aromatics-rich product by contacting the feedstock with acidic siliceous zeolite conversion catalyst particles at elevated temperature between about 200 degrees C. to 650 degrees C. under aromatization conditions to produce heavier hydrocarbons including aromatic hydrocarbons comprising:
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introducing lower olefinic feedstock comprising at least one C4 -C6 diene component into a bed of catalyst particles to convert feedstock to heavier hydrocarbon rich in aromatics; separating an aromatics-rich C5+ liquid stream from fluidized bed reaction effluent; extracting aromatics components from the liquid stream and recovering a product stream comprising at least 50 wt% C6 -C10 aromatic hydrocarbons. - View Dependent Claims (2, 3)
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4. In the process for catalytic conversion of lower olefinic hydrocarbon feed to heavier hydrocarbons wherein the olefinic feedstock is contacted under conversion conditions at elevated temperature with an acidic medium pore shape selective metallosilicate catalyst, the improvement which comprises:
cofeeding at least one C2 -C4 mono-alkene with at least one C4 -C6 conjugated diene for concurrent conversion to an aromatics-rich C5+ liquid product at a temperature between about 200 degrees C. to 650 degrees C. whereby an improved yield of aromatics is produced. - View Dependent Claims (5, 6, 7)
- 8. In the process for producing benzenoid hydrocarbons from aliphatic hydrocarbon feed by contacting with a medium pore shape selective acid zeolite catalyst at elevated reaction temperature, the improvement which comprises feeding a conjugated di-ethylenically unsaturated diene with the aliphatic hydrocarbon feed under aromatization conditions between about 200 degrees C. and 650 degrees C. in an amount to increase C6 -C8 monocyclic benzenoid production substantially above that produced by diene-free aliphatic feed.
Specification