Elution yield definition

The definition of the conversion of gas oil was chosen to be consistent with the kinetic models used. On this basis the unconverted gas oil was taken as the fraction of products boiling above 220°C which in turn corresponds to compounds eluting from the chromatographic column after n-Ci2. Then, the GC-conversion of gas oil was defined as one hundred minus the weight percent of unconverted gas oil. This value was then corrected to account for the yield of coke to define the overall conversion. 

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