Direct match spectrographic determination of fuel properties

Abstract

A method and apparatus for deriving a refinery product property value based on data produced from a globally-calibrated spectrographic analyzer and data from a non-spectrographic analyzer.

1 - 27 . (canceled) 
     
     
         28 . An apparatus for direct match comparison, the apparatus comprising a spectrographic analyzer capable of receiving a property value of a first refinery product using a non-spectrographic test; determining a property value of the first refinery product using spectrographically determined data stored in a spectral library; determining a property value of a second refinery product; determining a difference between the spectrographically-determined property values of the first refinery product and the second refinery product; and adding the difference to the non-spectrographically-determined property value of the first refinery product to derive a property value for the second refinery product. 
     
     
         29 . A system for direct match comparison, the system comprising:
 a spectrographic analyzer capable of determining a property value of a test refinery product; and   a computer programmed to receive a property value of a reference refinery product, the property value determined using a non-spectrographic test; receive a property values of the reference refinery product from data stored in a spectral library; receive said property value of the test refinery product determined by the spectrographic analyzer; determine a difference between the spectrographically-determined property values of the test refinery product and the reference refinery product; and add the difference to the non-spectrographically-determined property value of the reference refinery product to derive a property value for the test refinery product.   
     
     
         30 . An apparatus for direct match comparison, the apparatus comprising a computer programmed (A) to receive (1) a property value of a first refinery product, the property value determined using a non-spectrographic test, (2) a spectrographically-determined property value of the first refinery product determined from data stored in a spectral library, and (3) a property value of a second refinery product determined using a spectrographic analyzer; (B) to determine a difference between the spectrographically-determined property values of the first refinery product and the second refinery product; and (C) add the difference to the non-spectrographically-determined property value of the first refinery product to derive a property value for the second refinery product.