17 Selective Analysis of Trace Level Carbonyl Sulphide in Propylene by Gas
Chromatography and Chemiluminescence as Alternative Detection for ASTM D5303 In processes producing propylene, trace level carbonyl sulphide (COS) acts as a poison to commercial polymerisation catalysts, resulting in deactivation and costly process downtime. Standard methods like ASTM method D5303 addresses this analysis but is limited to the analysis of COS within the range of 0.5 to 4.0 ppm mass.
The determination of COS in propylene is the most challenging because COS is not separated from the propylene matrix. On many detectors, the COS response is heavily affected by the propylene matrix which results in erroneous results; particularly when going to the often-desired low levels of as low as 30 ppb Mol.
The PAC SeNse Chemiluminescence Detector is the most advanced GC Detector available for the selective determination of sulphur containing compounds in hydrocarbon matrices. The PAC COS in Propylene analyser not only overcomes the analytical challenge of COS/Propylene coelution by unmatched selectivity, but also addresses the desired detection levels. Its performance exceeds ASTM D5303 requirements, providing accurate and repeatable data down to 30 ppb Mol.
CNS SIMDIS: Fast quantitative Boiling Point Distribution
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A few years ago, a new technique was developed in PAC to address this challenge: we named it CNS SIMDIS. Adding specific SCD and NCD detectors to a HT SIMDIS provides and analyser that generates complete hydrocarbon, sulfur and nitrogen boiling point distribution data in less than 30 minutes, without any sample preparation.
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Obviously CNS SIMDIS Data far superior distillation efficiency than the standard 15 plates in D2892, and thanks to the specific software it is extremely powerful in reporting. It reports Total Sulphur, Total Nitrogen, %recovery, TBP boiling point plots, %OFF reports for Carbon, Sulphur and Nitrogen, and various other typical SIMDIS correlations and parameters. For crudes with very light ends, a DHA- front end may be added as per ASTM D7900, for even better accuracy and precision.
Different studies have proven CNS data to compare very well with conventional techniques such as UV-F or X-ray for Sulphur and Nitrogen. The method has been in use in various refining labs, and the first reference method for Sulphur SIMDIS has already been published (D7807).
CNS SIMDIS combines the typical robustness and precision associated with Gas Chromatography with specific detection, and the ability to simulate boiling point over a very wide range. It delivers unique and actionable data addressing some of our most critical challenges fast and very early in the process, and therefore should be considered an essential tool in the refining process and refining R&D labs.
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Advanced Analytical Instrumentation for Lab and Process Applications
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data for Carbon, Sulphur and Nitrogen for Crude Oil In current volatile markets with diversifying qualities of crude sources and qualities, early crude assessment data is pivotal in decision-making. Doing so however, can be costly and time- consuming. Methods such as combustion UV-fluorescence and X-ray are widely used techniques for quantification of Sulphur and Nitrogen in crude. However, none of these provide boiling point specific distributions for these hetero-atoms. This creates the need to assay the crude first, and run multiple samples through the lab for measuring these key value differentiators.
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