Patent ID: 6490029
Filing Date: 2002-12-03
Classification: G01N

Abstract:
An automatic analysis method of crude oils, using spectroscopy, comprising the steps of:providing analysis equipment comprising: a distillation apparatus comprising: a vacuum part; a heating part; a separation column part; a liquified gas-collecting cylinder having absorbance spectrum-measuring cells; and a distillate-collecting part having a plurality of distillate-collecting cylinders; a spectroscopic analyzer comprising: a spectroscope for separating and providing light beams by wavelengths; a measuring cell for measuring samples for absorbance at predetermined wavelengths; and a fiber optic for connecting the spectroscope to the measuring cell; and a physical property-predicting model; measuring light components for absorbance at predetermined wavelengths in an on-line manner in the liquified gas-collecting cylinder, said gaseous components being distilled at the first time from a crude oil sample upon distillation; measuring distillates of the distillate-collecting cylinders, in sequence, for absorbance at predetermined wavelengths; predicting physical properties of the distillate samples from the spectrum data on the basis of the chemometrics theory; and producing assay data for crude oils from the predicted physical properties.