| US 7,468,126 B2 | ||
| Preparing small crystal SSZ-32 and its use in a hydrocarbon conversion process | ||
| Stacey I. Zones, San Francisco, Calif. (US); Guang Zhang, Walnut Creek, Calif. (US); Kamala Krishna, Danville, Calif. (US); Joseph A. Biscardi, Berkeley, Calif. (US); Paul Marcantonio, Galeta, Calif. (US); and Euthimios Vittoratos, Richmond, Calif. (US) | ||
| Assigned to Chevron U.S.A., Inc., San Ramon, Calif. (US) | ||
| Filed on Aug. 24, 2006, as Appl. No. 11/467,093. | ||
| Application 11/467093 is a division of application No. 10/698250, filed on Oct. 31, 2003, granted, now 7,390,763. | ||
| Prior Publication US 2007/0041898 A1, Feb. 22, 2007 | ||
| Int. Cl. C10G 45/64 (2006.01); B01J 29/06 (2006.01) | ||
| U.S. Cl. 208—26 [502/62; 502/85; 502/243; 502/250; 502/251; 502/263; 423/706] | 20 Claims |
| 1. The process for dewaxing a hydrocarbon feed thereby producing a maximized yield of isomerized product and a minimized yield
of light ends, the feed including straight chain and slightly branched paraffins having 10 or more carbon atoms, comprising
contacting the feed under isomerization conditions in the presence of hydrogen with catalyst comprising an intermediate pore
size molecular sieve which is prepared according to the following steps:
(a) synthesizing a zeolite having a mole ratio of silicon oxide to aluminum oxide greater than greater than about 20:1 to
less than 40:1, with crystallites having small broad lathe-like components in the range of 200-400 A, and having the x-ray
diffraction lines of Table 2B by employing the following steps:
(i) combining the followings reagents in the amounts specified to form a mixture:
(1) 5 parts of an N-lower alkyl-N′-isopropyl-imidazolium cation which has been ion-exchanged to the hydroxide form;
(2) 20 parts of an alkali metal hydroxide;
(3) 100 parts of SiO2 to 3.5 parts of Al2O3;
(4) 20 parts of an alkyl amine,
(ii) stirring the mixture of step (i) in an autoclave, under autogenous pressure, in a range of from 500 to 1500 rpm for a
period of 0.5 to 5 hours;
(iii) maintaining the mixture at an elevated temperature for a period of from 40 to 120 hours to form the crystals of the
zeolite;
(iv) collecting the crystals of the zeolite by filtration or by centrifugation;
(v) subjecting the crystals to calcination and ion exchange;
(b) mixing the zeolite synthesized in stage (a) with a refractory inorganic oxide carrier precursor and an aqueous solution
to form a mixture, the mixture having a molecular sieve content from about 10 to about 90 wt %;
(c) extruding or forming the mixture from step (b) to form an extrudate or formed particle;
(d) drying the extrudate or formed particle of step (c);
(e) calcining the dried extrudate or formed particle of step (d);
(f) loading of the extrudate or formed particle of step (d) with a hydrogenation component to prepare a catalyst precursor
(g) drying the catalyst precursor of step (f);
(h) calcining the dried catalyst precursor of step (f) to form a finished bound dewaxing catalyst.
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