Chemistry of hydrocarbon compounds – Aromatic compound synthesis – By isomerization
Patent
1986-01-15
1990-02-06
Pal, Asok
Chemistry of hydrocarbon compounds
Aromatic compound synthesis
By isomerization
585313, C07C 527
Patent
active
048990116
ABSTRACT:
A new xylene isomerization process which is capable of converting ethylbenzene and non-aromatic exhaustively while selectively converting xylenes to thermal equilibrium in mixed EB/xylene feeds is proposed. The new process employs a two component catalyst system; each of the components contains a strong hydrogenation metal and a zeolite. The zeolite of each of the two components differs from the other in its selectivity for xylene isomerization and its capacity to deethylete ethylbenzene. That selectivity for xylene isomerization is described by xylene diffusion properties of the zeolite. In one embodiment of the invention, ZSM-5 of greater than 1 micron crystal size and an alpha value of greater than 100 in a first component and ZSM-5 of less than 1 micron crystal size and an alpha of less than 100 in a second catalyst component satisfy the diffusion properties which allow for the exhaustive conversion of ethyl benzene and non-aromatics and the selectivity for xylene isomerization of typical xylene isomerization feeds. In a preferred embodiment, the feed is cascaded over the first component and then the aforementioned second component.
REFERENCES:
patent: Re31782 (1984-12-01), Olson et al.
patent: 3354078 (1967-11-01), Miale et al.
patent: 4101595 (1978-07-01), Chen et al.
patent: 4117026 (1978-09-01), Haag et al.
patent: 4159282 (1979-06-01), Olson et al.
patent: 4159283 (1979-06-01), Nicoletti et al.
patent: 4163028 (1979-07-01), Tabak et al.
patent: 4278565 (1981-07-01), Chen et al.
patent: 4312790 (1982-01-01), Butter et al.
patent: 4375458 (1983-03-01), Dwyer et al.
patent: 4467129 (1984-08-01), Iwayama et al.
Journal of Catalysis, vol. 4, pp. 527-529 (Aug. 1965), by P. B. Weisz and J. N. Miale, entitled "Superactive Crystalline Alumino-Silicate Hydrocarbon Cracking Catalyst".
Journal of Catalysis, vol. 6, pp. 278-287, (1966), by J. N. Miale, N.Y. Chen and P. B. Weisz, entitled "Catalysis by Crystalline Aluminosilicates, IV. Attainable Catalytic Cracking Rate Constants, and Superactivity".
"Catalysis by Crystalline Aluminosilicates: Characterization of Intermediate Pore-Size Zeolites by the `Constraint Index`" by V. J. Frillette, reprint from Journal of Catalysis, vol. 67, No. 1, Jan. 1981, pp. 218-222.
Chu Yung F.
Kresge Charles T.
LaPierre Rene B.
McKillop Alexander J.
Mobil Oil Corporation
Pal Asok
Schneller Marina V.
Speciale Charles J.
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