Chemistry: analytical and immunological testing – Optical result – Spectrum analysis
Patent
1997-04-09
1999-08-10
Soderquist, Arlen
Chemistry: analytical and immunological testing
Optical result
Spectrum analysis
364554, 364498, 422 62, 422 8205, 436 50, 436 52, 436 55, 436 60, 436139, 436140, 436141, 436142, 436164, 436183, G01N 3322
Patent
active
059358637
ABSTRACT:
A method of determining or predicting a value P.sub.x of a property of a feed X to a steam cracking process or yield of said process, which method comprises measuring the absorption D.sub.ix of said material at more than one wavelength in the region 600-2600 nm, comparing signals indicative of said adsorptions or a mathematical function thereof with signals indicative of absorptions D.sub.im or mathematical function thereof at the same wavelength for a number of standards S in a bank for which the said property or yield P is known, and choosing from the bank at least one standard S.sub.m with property P.sub.m said standard having the smallest average value of the absolute difference at each wavelength i between the signal for the material and the signal for the standard S.sub.m to obtain P.sub.x, with averaging of said properties or yields P.sub.m when more than one standard S.sub.m is chosen. If desired the method can be used as such to control the steam cracking process by comparison of P.sub.m with the desired value and adjustment of the process to minimize deviations from P.sub.m ; in an alternative process the signal (or function thereof) of the standard(s) with the smallest average value of the absolute difference may be used directly to control the process.
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Descales Bernard
Granzotto Claude
Lambert Didier
Llinas Jean-Richard
Martens Andre
BP Chemicals Limited
Naphtachimie S.A.
Soderquist Arlen
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