Spectroscopic determination of amount of one constituent of...

G - Physics – 01 – N

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G01N 21/25 (2006.01) G01N 33/28 (2006.01) G01N 21/84 (2006.01)

Patent

CA 2050108

A method (and apparatus) is disclosed for the spectroscopic determination of the amount ~Nn of one constituent N of a fluid mixture 0 in another constituent n of the mixture, following separation of the mixture into its constituents 1,...,M (where n, N ~ M). The method involves determining the absorptivities a n (n = 1,...,N) of the M constituents from spectroscopic measurements and computing the amount ~Nn from a mathematical expression containing the absorptivities a n and a N which are expressed or expressable as the quotient a n/a N only. The method is insensitive to changes in the absorptivities due to feed variability or changes in upstream process conditions. A modification to the method involves determining the content ~N0 of constituent N in feed 0 from a mathematical expression containing a0, where a0 is the absorptivity of the feed 0, and a N, which absorptivities a0 and a N are expressed or expressable as the quotient a0/a N only.

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