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.
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.