| http://www.w3.org/ns/prov#value | - To provide for the aforementioned yield benefits, the weight ratio of steam to heavy hydrocarbon feedstock (i.e., steam-to-oil ratio) introduced into the riser reactor zone with the middle distillate selective cracking catalyst and shape selective zeolite additive is such an amount as to be in the range upwardly to 15:1, but, preferably, in the range of from 0.1:1 to 10:1.
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