Patent ID: 6313366
Filing Date: 2001-11-06
Classification: C10G

Abstract:
A process for producing propylene comprisingcontacting a feed with a catalyst to form a cracked product, said feed comprising:(a) a naphtha stream containing (i) between about 10 and about 30 wt. % paraffins, (ii) between about 15 and about 70 wt. % olefins; and,(b) a separate aromatic stream comprising aromatics whereby the partial pressure of the olefins in the naphtha stream is lowered,the catalyst comprising a crystalline zeolite having an average pore diameter less than about 0.7 nm, the reaction conditions including a temperature from about 500.degree. C. to 650.degree. C., a hydrocarbon partial pressure of 10 to 40 psia, a hydrocarbon residence time of 1 to 10 seconds, and a catalyst to feed ratio, by weight, of about 4 to 10, wherein no more than about 20 wt. % of paraffins are converted to olefins and wherein propylene comprises at least 90 mol. % of the total C.sub.3 products.