Show Preview - PEFTEC 2017 VUV PIONA+ Extends its Compound Class Capabilities in Fuel Stream Analysis
VUV Analytics, Inc. has recently completed an investigation with coker naphtha samples that indicates VUV PIONA+ can be used to report compound class analysis of non-conjugated diolefi ns, conjugated diolefi ns, cycloolefi ns, and sulfur compounds. Individual analyte speciation is also possible for many of these compounds. Olefi ns, especially conjugated diolefi ns, are known to cause fouling of refi nery processes and to negatively impact product quality. VUV PIONA+ shows the potential for quickly characterizing the most problematic compounds.
VUV PIONA+ utilises single-column gas chromatography (GC) combined with vacuum ultraviolet (VUV) spectroscopy to provide accurate PIONA hydrocarbon compound speciation up to C6 and bulk compound class characterisation at higher carbon numbers. In addition, specifi c analytes throughout the chromatogram such as aromatics belonging to the BTEX complex can be targeted for speciation. The product solution combines a VGA-100, the world’s fi rst VUV absorption GC detector, with the automated software analysis of VUV AnalyzeTM
.
GC-VUV absorbance data is three dimensional (time, absorbance, wavelength) and specifi c to compound chemical structure. Chromatographic co-elution events can be addressed using VUV spectral matching and software deconvolution. VUV absorbance spectra are typically highly structured and distinct for individual compounds, yet exhibit the intuitive property of having similar features when measuring related compound classes.
The VUV AnalyzeTM engine implements equations
and fi t procedures that result in deconvolution of absorbance spectra that contain contributions from multiple species, is capable of binning and storing response contributions from each deconvolution analysis, and reporting a combined total response at the end of the analysis. The data processing includes a database library of VUV reference spectra, compound class information, density, approximate retention index values, relative response factors for each hydrocarbon class, and relative response factors for individually reported compounds. Compound class or specifi c compound concentrations can be reported as mass or volume percent.
The customisation of VUV PIONA+ for fuel streams like coker naphtha samples begins by locating diolefi ns, cycloolefi ns, or other compounds of interest in the VUV library that have retention index (RI) values and are associated with a VUV AnalyzeTM
method. These compounds can then
be added as “classes” to the VUV AnalyzeTM Relative Response Factors (RRF) fi le. In the recent investigation, nine non-conjugated diolefi ns (C3-C8), sixteen conjugated diolefi ns (C4-C8), and fourteen cycloolefi ns (C5-C10) were added to the RRF fi le to evaluate how they would be identifi ed and quantitated by VUV AnalyzeTM
. A
response factor value of 0.465 was used for all diolefi ns and cycloolefi ns. Compound class analysis was performed on most of these compounds, while key analytes such as 1-methylcyclopentene and cyclohexene were targeted for speciation. A similar setup procedure was applied to characterize thiophene and benzothiophene within the sample. Figure 1 shows the resolution of 1-methylcyclopentene and benzene co-elution within the coker naphtha chromatogram. VUV AnalyzeTM
automates the fi tting of analyte spectral
profi les with VUV library spectra to provide the identities and relative concentrations of the co- eluting compounds. The fi tting agreement between the spectral responses of both compounds with library spectra can be observed by viewing the zero-residual value and spectral agreement in the middle panel, as well as the statistical information in the bottom section of the VUV AnalyzeTM
Universal, yet selective detector with very sensitive spectral response
Unambiguous identification & quantitation of compounds, including isomers
Shorter GC runtimes
Easy deconvolution and quantitation of co-eluting analytes
No calibration required - 1st principle detection technique provides a predictable linear response
display.
The highlighted peaks show how this VUV PIONA+ customization can be used to target specifi c analytes within fuel stream samples and quickly identify critical compound classes.
For more detailed information please visit our website at
www.vuvanalytics.com, or contact us at
info@vuvanalytics.com.
For More Info, email: email:
For More Info, email: email:
44053pr@reply-direct.com
For More Info, email: email:
For More Info, email: email:
vuvanalytics.com VUV VE R I F I ED
7191ad@reply-direct.com
VUV Absorption Spectroscopy.
GC detection in a whole new light.
Making Vacuum Ultraviolet absorption spectroscopy available to the general scientifitic community for the first time. As in, ever.
Figure 1: Resolution of 1-methylcyclopentene and benzene co-elution within a coker naphtha chromatogram. VUV AnalyzeTM automates the fi tting of analyte spectral profi les with VUV library spectra to provide the identities and relative concentrations of the co-eluting compounds. The fi tting agreement between the spectral responses of both compounds with library spectra can be observed by viewing the zero-residual value and spectral agreement in the middle panel, as well as the statistical information in the bottom section of the VUV AnalyzeTM display. Highlighted peaks show how VUV PIONA+ customisation can be used to target specifi c compound classes within a fuel stream sample.
19
Page 1 |
Page 2 |
Page 3 |
Page 4 |
Page 5 |
Page 6 |
Page 7 |
Page 8 |
Page 9 |
Page 10 |
Page 11 |
Page 12 |
Page 13 |
Page 14 |
Page 15 |
Page 16 |
Page 17 |
Page 18 |
Page 19 |
Page 20 |
Page 21 |
Page 22 |
Page 23 |
Page 24 |
Page 25 |
Page 26 |
Page 27 |
Page 28 |
Page 29 |
Page 30 |
Page 31 |
Page 32 |
Page 33 |
Page 34 |
Page 35 |
Page 36 |
Page 37 |
Page 38 |
Page 39 |
Page 40 |
Page 41 |
Page 42 |
Page 43 |
Page 44 |
Page 45 |
Page 46 |
Page 47 |
Page 48 |
Page 49 |
Page 50 |
Page 51 |
Page 52 |
Page 53 |
Page 54 |
Page 55 |
Page 56 |
Page 57 |
Page 58 |
Page 59 |
Page 60 |
Page 61 |
Page 62 |
Page 63 |
Page 64 |
Page 65 |
Page 66 |
Page 67 |
Page 68 |
Page 69 |
Page 70 |
Page 71 |
Page 72 |
Page 73 |
Page 74 |
Page 75 |
Page 76
