FlexStream modular gas-standards-generating system

The new FlexStream modular gas-standards-generating system uses proprietary Trace Source permeation tubes that add precise concentrations of sulfur compounds to nitrogen, ethylene or propylene matrices. Typical polymerization processes require monomers with concentrations less than 1 ppmw total sulfur, less than 1 ppmw H2S, and less than 50 ppbw of COS. Calibration standards at those levels are not readily available and tend to be unstable in storage. The FlexStream system is configured with two permeation ovens and a secondary dilution module, and it can produce mixtures containing H2S, COS, and a range of higher-boiling sulfur compounds (such as dimethyl sulfide and thiophene) to assure accurate desired total sulfur levels. An internal microprocessor system sets dilution flows and selects the proper operating mode to create specific concentrations.