Servomex to supply gas analysers for TDI plant

Servomex, a specialist in gas analysis, has been chosen to supply a complete gas analysis monitoring system to a toluene di-isocyanate (TDI) plant currently under construction in Dahej, India.

Chematur Engineering AB of Sweden has selected Servomex and channel partner Omniprocess AB to supply these critical instruments to the 50,000MTA-capacity plant being built on behalf of Indian chemical manufacturer GNFC.

The system will help control the process and monitor the quality of output in the manufacture of TDI, a key isocyanate used in the manufacture of polyurethane and for a variety of applications including flexible foams used in furnishings and the motor industry.

Servomex will supply a range of gas analysers to fulfil the complex requirements of TDI monitoring, including 15 Servotough Spectraexact 2500 process gas analysers, two Servopro 4210 gas purity analysers, one Servotough Oxyexact 2200 paramagnetic oxygen analyser and three k1550 katharometer-based analysers.

Designed, manufactured and tested in configurations specific to the required measurement and background stream, the Servotough Spectraexact is a photometric process analyser that offers single- or dual-component gas analysis to suit virtually any process, combustion or emissions gas analysis application.

This makes it suitable for several TDI measurement processes, including monitoring the off-gases from mixing chlorine with carbon monoxide to make phosgene and the monitoring for both carbon monoxide and chlorine in phosgene.

Control of residual O2 concentration in pure CO in the zero per cent to 0.5 per cent range will be made by the Servotough Oxyexact 2200, with a measurement precision made possible by Servomex's paramagnetic cell technology that enables an oxygen measurement that is totally unaffected by other gases in the monitor stream.

The Servopro 4210 gas purity analysers will monitor the level of specific impurities in pure H2 and pure CO respectively, with one unit monitoring a pure hydrogen stream for trace carbon monoxide and other 4210-based system monitoring for the presence of methane in CO.

Finally, three k1550 katharometer analysers will monitor the hydrogen purity and the quality of CO supply to the TDI process by checking the level of residual H2 remains between zero per cent and one per cent.

Each Servomex gas analyser will be installed in its own cubicle with an appropriate sampling system and all necessary pipework, ready for connection in the appropriate area of the plant.

The TDI plant is scheduled for completion in September 2010.

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