Hydrocarbon conversion process employing essentially alumina-fre

Details Hydrocarbon conversion process employing essentially alumina-fre Hydrocarbon conversion process employing essentially alumina-fre

1981-03-16

1983-01-25

Gantz, Delbert E.

Mineral oils: processes and products

Chemical conversion of hydrocarbons

Plural serial stages of chemical conversion

208 61, 208 66, 208109, 208118, C10G 4716, C10G 6904, C10G 6912, C10G 1105

Patent

active

043702198

ABSTRACT:
A process for converting a hydrocarbonaceous feedstock in which a catalytically hydroprocessed or a catalytically reformed feedstock is contacted under cracking conditions with an essentially alumina-free intermediate pore size zeolitic catalyst and immediately thereafter with a second essentially alumina-free intermediate pore size zeolitic catalyst under cracking conditions less severe than the first contacting conditions. The less severe conditions in the second contacting stage are preferably obtained by employing a lower temperature, although use of a less active catalyst to attain this end is a possibility. A crystalline chromia silicate having a mole ratio of oxides SiO.sub.2 :Cr.sub.2 O.sub.3 of greater than about 20 to 1 and an intermediate pore size crystalline silicate of the ZSM-5 type having a mole ratio of oxides SiO.sub.2 :Al.sub.2 O.sub.3 of greater than about 200 are the preferred catalysts.

REFERENCES:
patent: Re29948 (1979-03-01), Dwyer et al.
patent: 4093560 (1978-06-01), Kerr et al.
patent: 4244807 (1981-01-01), Dautzenberg et al.
patent: 4309275 (1982-01-01), Mulaskey

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