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determining vapor pressures by relative retention time
Posted: Thu Mar 09, 2006 5:19 pm
by MrShorty
I've seen mentioned that there's a technique out there for determining vapor pressures using GC based on relative retention times. I'm looking for an introductory article or similar to explain how this technique works. I checked the technical literature sections of supelco, alltech, and agilent and didn't find anything (didn't know where to look??). Can anybody point me to a source with a good introduction to this technique?
Posted: Fri Mar 10, 2006 6:09 pm
by Rafael Chust
There is a GC technique developed for the petroleum industry called SIMDIS (Simulated Distillation).
Look for references on that, if is what you are looking for.
DHA Analysis
Posted: Tue Mar 14, 2006 12:33 am
by Les
The Detailed Hydrocarbon Analysis utilizes retention index to identify complex hydrocarbon mixtures. The DHA analyzes the components and builds calculations of RVP, distillation, bromine number, octane rating, and the distribution of Parafins, Isoparafins, Aromatics, Naphthenes, Olefins (PIANO). The analysis is only as good as the chromatography. I use a 100 meter column of boiling pt order with a 120 min run time. The column is over 17 yrs old, and I've been toying with the idea of changing for a newer technology.
Posted: Wed Mar 15, 2006 4:01 pm
by Vincent
We (AC Analytical Controls) have been doing some investigation about this subject ourselfs.
I can recomment you the following papers/publications:
Journal of Chromatography A, 923 (2001) 137-152
Comparison of methods employing gas chromatography retention
data to determine vapour pressures at 298 K
Bohum´ır Kouteka, Josef Cvacˇkaa, Ludv´ık Streinza, Pavl´ına Vrkocˇova´ a, Jan Doubsky´ a,Hana Sˇimonova´b, Ladislav Feltlb, Va´clav Svobodac
J. High Resol. Chromatogr. 22, 565-588 (No. 10, 1999)
Determination of Vapor Liquid Equilibrium from the Kovats Retention Index on Dimethylsilicone using the Wilson Mixing Model
Walter Spieksma
Kind regards,
Vincent