Measurement and Testing
Trace H2S analysis in complex gas mixtures
Dec 17 2019 Read 447 Times
Hydrogen sulphide (H2S) is a very flammable, corrosive and toxic gas, with a characteristic odour of rotten eggs. Even when present at low trace-level concentrations, H2S can damage equipment, pipelines and lead to catalyst poisoning. Therefore, it must be carefully monitored and controlled in industrial processes where it is generated or used.
Chromatotec®’s H2S MEDOR analyser measures H2S in gas samples at trace-level concentration ranges (0-1ppm). It consists of an automatic process gas chromatograph (autoGC) equipped with a sulphur specific electrochemical wet cell detector (ED) which only reacts with sulphur compounds and provides excellent results down to 1ppb. All compounds have a linear response with the ED, with R2> 0.995. Moreover, theMEDOR® detectoris not affected by the moisture in the sample, which can be up to 100% relative humidity.
The H2S MEDOR is available with a dedicated configuration for safe and hazardous areas (ATEX, IECEx, CSA and CSA international certifications) including an integrated N2 generator. Its simplicity for online application in refineries and petrochemical plants is achieved thanks to its flameless detector for which no hydrogen is required. Specially designed for on-field deployment, this standalone solution includes a built-in nitrogen generator and a touch screen display behind the front door of the wall-mounted cabinet. It is temperature controlled for outdoor installation to provide the best performance for operation from -10 to +55°C.
The versatile and robust H2S MEDOR analyser has been used for H2S measurement in a recycle gas stream composed of up to 60% of H2 as well as in reactor’s effluent gas with very high concentrations of COS (5000 ppm).
The H2S MEDOR is a reliable, simple and robust turnkey solution. It is fully autonomous thanks to its integrated gas generators which avoid the need for gas cylinders and embedded, internal calibration for automatic data validation. Moreover, this process analyser is designed to have very low maintenance requirements.
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