Analytical Instrumentation 25 Better Silicon Detection Counts


XOS (USA) announces its latest product introduction – the Signal analyser – features XOS’s robust, widely used Monochromatic Wavelength Dispersive X-Ray Fluorescence (MWD XRF) to detect Silicon down to 0.5 ppm with the XOS-exclusive advantage of unprecedented precision at the push of a button.Signal effectively eliminates extensive sample preparation associated with ICP while offering better precision in a 10-minute measurement cycle: Placing the sample in a standard XRF sample cup is the only handling required for the measurement. This Silicon quantification capability is available for petroleum matrices, additives and bio-fuels, including ethanol.


XOS’s MWD XRF platform technology is also used in the company’s award-winning Sindie and Clora line analysers to quantifySulphur and Chlorine in hydrocarbon, aqueous and bio-fuels matrices. “XOS is leading the ASTM D2.03 Task Group for the development of an ASTM standard test method for the Signal technology, and a wide ranging inter-laboratory study has been completed in support of this ASTM method development effort,” said Berry Beumer, Vice President of Sales and Marketing at XOS.


MWD XRF uses state-of-the-art focusing and monochromating optics to increase excitation intensity and offers a dramatic improvement of signal-to-background over high-power traditional WD XRF instruments. This enables significantly improved detection limits and enhanced precision from crude oils matrices to bio-fuels. MWD XRF is a direct measurement technique that does not require sample treatment or sample conversion and does not involve high-temperature operations or processing.


For more information, contact XOS at info@xos.com or visit our website at www.xos.com. Reader Reply Card No 88 Sulphur in Oil Analyser Achieves a Detection Limit of 30 ppb


The new international regulations for low sulphur content in refined petroleum products such as gasoline or diesel are more and more demanding and the levels are always pushing lower. It has already been agreed that concentrations have to be less than 10 ppm and even less than 5 ppm in the future. Horiba Scientific (France), offers the appropriate solution with the SLFA-UV21A.


The SLFA-UV21A uses unique features such as a four-axes auto-sampler that allows the use of a horizontal combustion tube, automatic back flushing rinse and programmable tube cleaning. The exclusive reflected type filter (RTF) maintains 75% of the UV excitation power compared to penetrated type filter designs, which only pass 15%, resulting in higher sensitivity.


The SLFA-UV21 A is based on the principle of combustion of a fixed volume of sample in a tubular resistance furnace at 1100°C, with real time combustion control and optimisation. UV Fluorescence is used to analyse the SO2 gas produced during combustion. The SLFA-UV21 A is compliant with ASTM D-5453 as well as ISO 20846.


Reader Reply Card No 89


Laboratory Fluorinated By-products Analyser


The Hydrofluoric (HF) Alkylation process catalytically combines C3 – C5 olefins with isobutene to produce motor fuel alkylate. There is an increasing demand for alkylate because of its properties as a low-sulphur, high-octane blending component for unleaded and reformulated gasoline. The products of the process contain traces of HF and organofluoride by-product compounds. Elevated levels of residual fluorinated by-products in process streams can cause serious problems in refinery operations including corrosion, catalyst poisoning, downtime, and lost production. Fluorinated by-products are removed by catalytic decomposition at 177 – 220 °C to HF and olefins. The HF released during this decomposition step is removed by adsorption on a bed of alumina forming aluminium fluoride. This step reduces total fluoride levels from approximately 100 – 400 ppm down to low ppm levels in the motor fuel alkylate. OI Analytical’s FBA 5320 is a laboratory fluorinated by-products analyser (FBA) designed to detect and measure total fluorinated contaminants (HF and organofluoride compounds) in liquid propane, liquid butane, and motor fuel alkylate from the HF alkylation process.The analyser is based on an Agilent 7890 gas chromatograph equipped with an automated liquid sampling valve for sample introduction, a packed-inlet injection port, a stainless steel column, and a 5320 Electrolytic Conductivity Detector (ELCD) configured for fluoride detection. The FBA 5320 accurately detects total fluoride concentrations in the low parts-per-million (ppm) range. The FBA 5320 is typically calibrated with a calibration gas mixture (e.g. 3-fluoropropane in n-Butane) or using a sample from a


C4 process stream analysed by the Wickbold Method (ASTM D 7284). The measurement range of the FBA 5320 is 0.02 to 100ppm-F.


OI Analytical www.oico.com


Reader Reply Card No 90


Superior Selectivity and Sensitivity in Sulfur Analysis


PFPD – Pulsed Flame Photometric Detector Selective, high sensitivity detection of sulfur compounds in liquid-phase petrochemicals


OI Analytical is a leading provider of instrumentation for selective, high sensitivity measurement of sulfur compounds in petrochemicals.


The PFPD – Pulsed Flame Photometric Detector measures known and unknown sulfur compounds in liquid-phase samples from low ppb to ppm levels, and total sulfur as the sum of all sulfur compounds. Simultaneous sulfur and hydrocarbon chromatograms from the PFPD provide a unique analytical capability for ultra-low-sulfur fuels.


The S-PRO 3200 GC system is equipped with special components to measure sulfur compounds in gas-phase samples such as; natural gas, propylene, ethylene, and liquefi ed petroleum gas (LPG).


S-PRO 3200


Automated GC System for Sulfur Analysis Custom-confi gured gas chromatograph for measurement of sulfur compounds in gas-phase petrochemicals


Reader Reply Card No 91


February / March 2011•www.petro-online.com


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