Chemistry of hydrocarbon compounds – Plural serial diverse syntheses – To produce aromatic
Patent
1996-10-30
1999-09-21
Griffin, Walter D.
Chemistry of hydrocarbon compounds
Plural serial diverse syntheses
To produce aromatic
585449, 585450, 585467, 585475, C07C 100, C07C 264, C07C 268, C07C 522
Patent
active
059556420
ABSTRACT:
An alkylation/transalkylation process involving vapor phase alkylation of a benzene feedstock in a multi-stage alkylation zone having a plurality of series connected catalyst beds containing a pentasil aromatic alkylation catalyst, such as silicalite, coupled with intermediate separation and recirculation steps and liquid phase transalkylation over a transalkylation catalyst comprising a molecular sieve having a pore size greater than the pore size of the silicalite. The benzene containing feedstock is supplied to the multi-stage alkylation reaction zone along with a C.sub.2 -C.sub.4 alkylating agent operated under temperature and pressure conditions to maintain the benzene in the gas phase. Alkylated product is recovered from the alkylation zone and supplied to a benzene recovery zone for the separation of the benzene from the alkylation product. Benzene from the benzene recovery zone is recycled to the reaction zone. A higher boiling bottom fraction containing a mixture of monoalkylated and polyalkylated aromatic components is supplied to a secondary separation zone from which a monoalkylated aromatic component, e.g. ethylbenzene, is recovered overhead with a heavier polyalkylated aromatic recovered as a bottom fraction. The bottom fraction may be applied to a tertiary separation zone.
REFERENCES:
patent: 4107224 (1978-08-01), Dwyer
patent: 4169111 (1979-09-01), Wight
patent: 4185040 (1980-01-01), Ward et al.
patent: 4284529 (1981-08-01), Shihabi
patent: 4559314 (1985-12-01), Shihabi
patent: 4772456 (1988-09-01), DeClippeleir et al.
patent: 4774377 (1988-09-01), Barger et al.
patent: 4774379 (1988-09-01), Butler et al.
patent: 4781906 (1988-11-01), Cahen et al.
patent: 4922053 (1990-05-01), Wagnespack
patent: 4992607 (1991-02-01), Harandi et al.
patent: 5030786 (1991-07-01), Shamshoum et al.
patent: 5157180 (1992-10-01), West et al.
patent: 5324877 (1994-06-01), West et al.
Kakotailo et al, "Pentasil Family of High Silica Crystalline Materials," Chem. Soc. Special Publ. 33, 133-139 (1980).
Wu et al, "ZSM-5-Type Materials. Factors Affecting Crystal Symmetry," The Journal of Physical Chemistry, vol. 83, No. 21, 1979.
Gourgue et al, "Physico-chemical characterization of pentasil type materials, I. Precursors and calcined zeolites," Zeolites, 1985, vol. 5, Nov.
Gourgue et al, Physico-chemical characterization of pentasil type materials, II. Thermal analysis of precursors, Zeolites, 1985, vol. 5, Nov .
Butler James R.
Merrill James T.
Cheairs M. Norwood
Dang Thuan D.
Fina Technology, Inc.
Griffin Walter D.
Jackson William D.
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