Recycle hydrocracking

In this paper we compare behavior of catalysts in extinction recycle hydrocracking. In such a processing scheme, all of the feed is ultimately converted to product boiling below a certain predefined temperature. The reaction paths of individual feed components may differ from catalyst to catalyst. Product distributions and properties are examined to determine the general effects of changes in catalytic properties. 

The properties of the 650° F+ fraction of the hydrotreated shale oil also indicate that it will be an appropriate feed to an extinction recycle hydrocracker in situations where jet fuel is a desired product. Supporting pilot plant studies are described elsewhere (1,2,3). 

Hydrotreat reform hydrodealkylate. b Recycle hydrocrack hydrotreat reform hydrodealkylate. c Recycle hydrocrack gas oil recycle hydrocrack mid-distillate hydrotreat re- ... 

Naphthas topped off hydrocrackates, remainder recycled hydrocracking at 1500 psig, 450°C, but for recycle, at 4.8 LHSV and 22 scf H2/bbl feed rate. 

Recycle hydrocracking plants are designed to operate at hydrogen partial pressures from about 1200 psi to 2300 psi depending on the type of feed being processed. Hydrogen partial pressure is set in the... 

Recycle hydrocrack gas oil recycle hydrocrack mid-distillate hydrotreat reform hydrodealkylate. 

Source F. C. Wood, C. P. Reeg, A. E. Kelley, and G. D. Cheadle, Recycle Hydrocracking Process for Converting Heavy Oils to Middle Distillates, U.S. Patent 3,554,898. 

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