For petrochemicals, the main use of gas chromatography is controlling the production of saturated hydrocarbons, olefins and light diolefins. Careful screening of the incoming feedstock, which is cracked in pyrolysis, is required for process troubleshooting as incoming raw materials are highly variable. Chemicals that enter the process can poison catalysts, or may not be condensable and create a negative effect on the heat exchange or distillation processes, specifically sulfur compounds which can corrode equipment, poison catalysts during production and affect polymer yield. Routine measurements of ethane, ethylene, propane and propylene allows for proper control of the cracking operation to optimize process efficiency.
Known advantages of VUV Spectroscopy
- Unambiguous matching of key analytes including light hydrocarbons
- Ability to leverage class similarities for simplified analyses such as PIONA
- Easy optical resolution of chromatographic challenges like isomers, aldehydes, catalyst killers, and water
- Methods can be automated for multiple analyte targeting such as stream composition, process conversion, and multiple impurity scenarios
- Enables chromatographic compression for higher analysis productivity
- Easy to understand quantitative analysis by Beer-Lambert Law, with single order molar absorptivity
Solving Analytical Challenges in Petrochemical
Key Features of VUV Spectroscopy
- High degree of data analysis automation reduces human error
- Intuitive spectral fingerprint compound identification and Beer’s Law quantitation eliminates guesswork
- Software deconvolution of co-eluting analytes allows chromatography runtimes to be deliberately compressed
- Proprietary algorithms automate compound class characterization
Shining a new light in gas chromatography and streaming gas applications.
Everything absorbs strongly in the VUV spectrum. Compounds can be unambiguously identified and quantitated in a variety of applications including oil & gas, forensics, fragrances & flavors, petrochemical, environmental, and life science. VUV detectors provide unmatched selectivity of isomers and co-eluting analytes without the need for chromatographic baseline resolution. Unlike legacy detection methods, VUV spectroscopy allows for more automated analysis with lower risk of errors, shorter chromatography run times, and higher analytical throughput.
- Universal, yet selective detector with very sensitive spectral response
- Easy deconvolution and quantitation of co‑eluting analytes
- Robust technology with no reliance on vacuum pumps
- No calibration required – 1st principle detection technique provides a predictable linear response
- A non-destructive technique that compliments mass spectrometry
Vacuum ultraviolet absorption spectroscopy as an alternative detection system to mass spectrometry for the analysis of breath gas – a feasibility study
Beate Gruber, Dale Harrison, Ralf Zimmermann, Thomas Gröger Joint Mass Spectrometry Centre of the University of Rostock and the Helmholtz Zentrum München (JMSC), Neuherberg, D-85764, Germany Download Slides VUV absorption spectroscopy was successfully combined with GCxGC and applied for breath gas analysis. The selectivity and validity of the spectroscopy information simplifies the identification of breath...
Transformer Oil Gas Analysis (TOGA) Using Gas Chromatography –Vacuum Ultraviolet Absorbance Spectroscopy
GC-VUV offers a powerful, yet simple alternative for the characterization of bio-based transformer oil gases without the use of methanizers. Pittcon 2016
Finding VUV’s “Killer Application”Cary Anne Simpson
Cary Anne Simpson
Earlier this year my general practitioner measured my height at my regular check-up. What-the-heck? I’m used to my kids standing under the ruler annually, but I haven’t done that in…well, never mind. It doesn’t matter how long it has been since I stopped growing. I, of course, asked why I was being measured and was...
Analytical performance characteristics of a new vacuum ultraviolet (VUV) detector for gas chromatography (GC) are reported.
“The VUV detector has proven itself with the ability to distinguish olefins and aromatics from aliphatics – that’s a killer application given the complexity and time involved using any other technique. The VUV detector’s ability to perform a more accurate and much more robust PIONA analysis is an important milestone in its ongoing success.”
Bill Winniford, Fellow
Bill Winniford, Fellow, The Dow Chemical Company, Houston, Texas, USA
“VUV spectroscopy adds a dimension that is complementary to mass spectrometry, offering selectivity that is difficult to otherwise obtain.”
Hans-Gerd Janssen, Professor and Science Leader
Hans-Gerd Janssen, Professor, University of Amsterdam, and Science leader, Unilever Research Vlaardingen, the Netherlands
“One of the main advantages of VUV detection for us appeared to be the ability to gain more specific molecular information…co-elutions that we know exist but cannot be identified with FID can be unraveled.”
Pierre Giusti, Molecular Separation & Identification Service Manager, and Gaelle Jousset, Gas Chromatography Laboratory Manager
Pierre Giusti, Molecular Separation & Identification Service Manager, and Gaelle Jousset, Gas Chromatography Laboratory Manager, Research & Development, TOTAL Refining & Chemicals, Normandy, France
“The VUV detector will be used as a universal, calibration-free tool that provides the relative quantitative values of distinct molecules in mixtures in a rapid manner.”
Luigi Mondello, Chair of ISCC and GCxGC Conference in Riva del Garda, and Professor
Luigi Mondello, Chair of ISCC and GCxGC Conference in Riva del Garda, and Professor, University of Messina, Italy
“One thing that I really like about VUV is that it can be considered a universal detector but with the advantage of being familiar to us. We all used UV spectrometers in school.”
Nicholas Snow, Professor
Nicholas Snow, Professor, Seton Hall University, New Jersey, USA
“Eliminates ionization inefficiencies that are encountered in mass spectrometry analysis."
Mark R. Emmett, Ph.D.
Mark R. Emmett, Ph.D. Professor, The University of Texas Medical Branch Galveston, UTMB Cancer Research Center
“An amazingly simple concept extended into a powerful spectral region."
Tim Hossain, Ph.D.
Tim Hossain, Ph.D. Chief Scientist, Cerium Laboratories
“The VUV detector is a powerful new tool in the GC toolbox."
Kevin A. Schug, Ph.D.
Kevin A. Schug, Ph.D. Professor & Shimadzu Distinguished Professor of Analytical Chemistry, The University of Texas at Arlington