Back to results
US 7,094,940 B2Granted
Integrated process for the preparation of alkyl and alkenyl substituted aromatic compounds
AssigneeSnamprogetti S.p.A.
InventorsIvano Miracca, Guido Capone
Life of this patent
Estimating the term…
Abstract
Integrated process for the production of alkyl and alkenyl substituted aromatic compounds which comprises simultaneously dehydrogentaing in a reactor-regenerator system a mixture containing an alkyl and an aromatic alkyl hydrocarbon coming from an alkylation unit and recycling the dehydrogenated alkyl hydrocarbon thus produced, after separation, to the alkylation unit.
Claims36
An integrated process for the production of alkyl and alkenyl substituted aromatic compounds which comprises:
- a) feeding to an alkylation unit, a stream consisting of a C6–C12 aromatic hydrocarbon and a recycled stream containing a C2–C5 alkenyl hydrocarbon;
- b) optionally mixing the stream leaving the alkylation unit, containing the alkylaromatic compound, with a stream consisting of a C2–C5 alkyl hydrocarbon;
- c) feeding the stream of step (b) to a fluid bed dehydrogenation/regeneration unit containing a catalyst capable of dehydrogenating, also simultaneously, the alkyl hydrocarbon, optionally present, and the alkylaromatic compound;
- d) continuously discharging the exhausted catalyst which accumulates on the bottom of the dehydrogenation reactor and feeding it to the head of the regeneration reactor;
- e) continuously discharging the regenerated catalyst which accumulates on the bottom of the regeneration reactor and feeding it to the head of the dehydrogenation reactor;
- f) feeding the hydrocarbon stream leaving the dehydrogenation reactor to a separation section to produce a stream essentially consisting of the alkenyl substituted aromatic compound and a stream containing the alkenyl hydrocarbon;
- g) recycling the stream containing the alkenyl hydrocarbon to the alkylation unit;
- said integrated process being characterized in that the fluid for transporting the catalyst, which is deposited on the bottom of the regenerator at a temperature of 650–800° C., to the dehydrogenation reactor consists of a C2–C5 alkylhydrocarbon.
5 more elements
An integrated process for the production of alkyl and alkenyl substituted aromatic compounds which comprises:
- a) feeding to an alkylation unit, a stream consisting of a C6–C12 aromatic hydrocarbon and a recycled stream containing a C2–C5 alkenyl hydrocarbon;
- b) optionally mixing the stream leaving the alkylation unit, containing the alkylaromatic compound, with a stream consisting of a C2–C5 alkyl hydrocarbon;
- c) feeding the stream of step (b) to a fluid bed dehydrogenation/regeneration unit containing a catalyst capable of dehydrogenating, also simultaneously, the alkyl hydrocarbon, optionally present, and the alkylaromatic compound;
- d) continuously discharging the exhausted catalyst which accumulates on the bottom of the dehydrogenation reactor and feeding it to the head of the regeneration reactor;
- e) continuously discharging the regenerated catalyst which accumulates on the bottom of the regeneration reactor and feeding it to the head of the dehydrogenation reactor;
- f) feeding the hydrocarbon stream leaving the dehydrogenation reactor to a separation section to produce a stream essentially consisting of the alkenyl substituted aromatic compound and a stream containing the alkenyl hydrocarbon;
- g) recycling the stream containing the alkenyl hydrocarbon to the alkylation unit;
- said integrated process being characterized in that the fluid for transporting the catalyst, which is deposited on the bottom of the regenerator at a temperature of 650–800° C., to the dehydrogenation reactor, consists of a C2–C5 alkyl hydrocarbon and that the dehydrogenation reactor is a riser reactor in equicurrent, in which the solid is completely carried upwards pneumatically by a gas.
5 more elements
Dependencies are inferred from the claim text.