Abstract
The central problem in developing a sound pyrolysis model for petroleum fractions such as naphthas and gas oils is that of characterizing feed conversion, or cracking severity. Direct measurements of feed conversion are precluded by the large number of feed components and the difficulty of quantitatively analyzing them in reactor effluents. In this work a cracking severity model is presented wherein feed conversion is expressed in terms of readily accessible parameters, the C/sub 3/ and lighter yield and the hydrogen content of the C/sub 5/+ product. Theoretical development of the model is followed by the validation against both in-house pilot and literature data. The severity parameter is seen to provide a more realistic interpretation of yield structure, and by introduction of suitable feed characterization parameters can be applied as a general pyrolysis reactor design tool. This work is of interest in the design of a pyrolysis reactor. 37 refs.
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