OFFLINE SAMPLING OF HIGH PRESSURE GASES
Large quantities of hydrogen are required in industry for the manufacture of ammonia, hydrogeneration reaction such as the hardening of fats and for reducing the oxides of some metals such as those of Molydendum and Tungsten. Part of this hydrogen is obtained as a by-product of other manufacturing operations, of which the most important are the electrolytical alkali processes and the carbonisation of coal.
The “crack gas” obtained when high boiling point petrochemicals are pyrolysed also contains substantial amounts of hydrogen that can be recovered by fractional condensation.
Mercury is a contaminant in the production of hydrogen since it is present in petrochemical chemical feedstocks, coke and it is used in electrolytic chlor-alkali processes. The volatility of mercury is such that the majority of the mercury in feedstocks is transferred to the hydrogen produced, therefore there is not only a need to remove Hg from the hydrogen but also to provide a reliable method of determination.
Offline Sampling of Hydrogen
The 10.537D is a portable offline sampling device certified to (ExdIIB+H2T3) which means that it can be used in hazardous explosive areas.
Offline Measurement of Mercury in Hydrogen
The Sir Galahad instrument (10.525) operates on the principle of dual amalgamation coupled to atomic fluorescence spectrometry. Prior to sampling the sampling tubes are cleaned to give a reproducible blank. Calibration is achieved using the vapour injection technique. A known volume of the gas is then passed over a gold tube which is then taken to the analyser for quantification.
To discuss particular requirements and for more detailed information on the above products please complete the Information Request Form.
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