H2S measurement in titanium plant exhaust gas

Two processes are used for Titanium Dioxide (TiO₂) pigment manufacture: the sulfate (using sulfuric acid) or the chloride (using chlorine) route. The first digestion step of the sulfate process leads to off-gases containing H₂S.

The off-gases must be scrubbed to decrease H₂S concentrations before discharge because this flammable, corrosive and toxic gas can damage equipment, pipelines and lead to catalysts poisoning even at low trace-level concentrations.

The H2S MEDOR analyzer was used to monitor the performance of the scrubbing process. The on-line measurement of H₂S concentrations up to 50 ppm was achieved for a reactor effluent gas with very high concentration of COS (5000 ppm).

Chromatotec®’s H2S MEDOR analyzer consists of an automatic process Gas Chromatograph (autoGC) equipped with Sulfur Specific Electrochemical wet cell Detector (ED) which only reacts with sulfur compounds and providing excellent results down to 1ppb. All compounds have a linear response with the ED, with R² > 0.995. Moreover, the MEDOR® detector is not affected by the moisture in the sample.

It is available with dedicated configuration for safe and hazardous areas (ATEX, IECEx, CSA and CSA international certifications). including an integrated N₂ generator : no Hydrogen is required. The H2S MEDOR includes and embedded internal calibration for automatic data validation.