Patent ID: 6118035
Filing Date: 2000-09-12
Classification: C10G

Abstract:
A process for the selective production of C.sub.2 to C.sub.4 olefins which comprises feeding a catalytically or thermally cracked naphtha feedstock containing about 10 to 30 wt. % paraffins and from about 15 to 70 wt. % olefins and steam into a reaction zone and reacting the naphtha with a catalyst containing 10 to 50 wt. % of a crystalline zeolite having an average pore diameter less than about 0.7 nm at conditions including a temperature from about 500.degree. 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, wherein propylene comprises at least about 90 mol. % of the total C.sub.3 products.