Characterization of pre-refined crude distillate fractions

摘要

Methods are provided for qualifying jet fuel fractions that are derived at least in part from pre-refined crude oil sources. The methods allow for determination of the stability of a jet fuel product over time by using an accelerated aging test. The methods are beneficial for verifying the stability of a jet fuel fraction that includes a portion derived from a pre-refined crude oil.

主权项

1. A method for preparing a jet fuel or kerosene product, comprising:
determining a breakpoint for a first sample of a distillate fraction, the distillate fraction having an initial boiling point of at least about 284° F. (140° C.) and a final boiling point of about 572° F. (300° C.) or less, at least a portion of the distillate fraction being derived from a first pre-refined crude oil; maintaining a second sample of the distillate fraction at a temperature of at least about 40° C. for an aging period; determining a breakpoint for the aged second sample of the distillate fraction, the breakpoint for the aged second sample being at least about 265° C.; and preparing a jet fuel product comprising a kerosene portion derived from a second pre-refined crude oil, the second pre-refined crude oil being derived from the same source as the first pre-refined crude oil, a volume percentage of the kerosene portion derived from the second pre-refined crude in the jet fuel product being about 110% or less of a volume percentage corresponding to the portion of the distillate fraction derived from the first pre-refined crude oil, the initial boiling point of the jet fuel product being at least about the initial boiling point of the distillate fraction, and the final boiling point of the jet fuel product being less than or equal to the final boiling point of the distillate fraction.