Process for the alkylation of aromatics
AssigneeFina Research, S.A.
InventorsJacques F. Grootjans, Pierre-Frederic J. Belloir, Eric J.G.M. Romers
Life of this patent
Estimating the term…
Abstract
A improved process is provided for the alkylation of aromatic compounds under at least partial liquid phase conditions, and in the presence of a zeolite-type alkylation/transalkylation catalyst. In accordance with the present process, a diluted aromatic hydrocarbon feedstock containing C.sub.5 -C.sub.7 olefins is brought into contact with a diluted olefinic feedstream in the presence of the alkylation/transalkylation catalyst. Prior to contact with the olefinic feedstream, C.sub.5 -C.sub.7 olefins present in the aromatic hydrocarbon feedstock are selectively hydrogenated.
Claims13
In a process for at least partial liquid phase alkylation and/or transalkylation of aromatic compounds, the steps comprising:
- (a) Subjecting a hydrocarbon feedstock comprising aromatics and C.sub.5 -C.sub.7 olefins to a selective hydrogenation of the C.sub.5 -C.sub.7 olefins, said feedstock diluted with at least 30 mole percent non-aromatic hydrocarbons;
- (b) supplying the feedstock resulting from step (a) to a reaction zone containing a zeolite-type aromatic alkylation/transalkylation catalyst;
- (c) supplying an alkylation agent comprising olefins to said reaction zone, said alkylation agent diluted with non-aromatic hydrocarbons;
- (d) operating said reaction zone at an average temperature and pressure sufficient to maintain said hydrocarbon feedstock comprising aromatics and said alkylation agent comprising olefins in at least partial liquid phase, said temperature and pressure conditions being effective to cause alkylation of said aromatic compounds by said alkylation agent in the presence of said catalyst;
- and
- (e) recovering alkylated aromatic compounds from said reaction zone.
In a process for at least the partial liquid phase alkylation and/or transalkylation of aromatic compounds, the steps comprising:
- (a) subjecting a hydrocarbon feedstock comprising aromatics and C.sub.5 -C.sub.7 olefins to a selective hydrogenation of the C.sub.5 -C.sub.7 olefins, wherein said feedstock contains less than 69 mole percent of aromatic compounds;
- and
- (b) supplying said feedstock resulting from step (a) to a reaction zone containing a zeolite-type aromatic alkylation/transalkylation catalyst, said catalyst selected from the group consisting of nickel, nickel molybdenum, cobalt-molybdenum or palladium catalyst deposited on a support preferably selected from alumina, silica or alumina- silica;
- (c) supplying an alkylation agent comprising olefins to said reaction zone, wherein said alkylation agent contains at least 2 mole percent ethylene and has a total C.sub.2 -C.sub.3 alkenes content in the range of 10 to 40 mole percent;
- (d) operating said reaction zone at an average temperature and pressure sufficient to maintain said hydrocarbon feedstock comprising aromatics and said alkylation agent comprising olefins in at least partial liquid phase, said temperature and pressure conditions being effective to cause alkylation of said aromatic compounds by said alkylation agent in the presence of said catalyst;
- and
- (e) recovering alkylated aromatic compounds from said reaction zone.
In a process for at least partial liquid phase alkylation and/or transalkylation of aromatic compounds, the steps comprising:
- (a) Subjecting a hydrocarbon feedstock comprising catalytic reformate containing C.sub.5 -C.sub.7 olefins to a selective hydrogenation of the C.sub.5 -C.sub.7 olefins, wherein the aromatic content of the feedstock is less than 70 mole percent;
- (b) supplying the feedstock resulting from step (a) to a reaction zone containing a zeolite-type aromatic alkylation/transalkylation catalyst;
- (c) supplying an alkylation agent comprising olefins to said reaction zone, wherein said alkylation agent is a by-product of an FCC gas oil cracking unit;
- (d) operating said reaction zone at an average temperature and pressure sufficient to maintain said hydrocarbons feedstock comprising aromatic and said alkylation agent comprising olefins in at least partial liquid phase, said temperature and pressure conditions being effective to cause alkylation of said aromatic compounds by said alkylation agent in the presence of said catalyst;
- and
- (e) recovering alkylated aromatic compounds from said reaction zone.
Dependencies are inferred from the claim text.