What are the applications of FTIR spectroscopy in process analysis?

FTIR (Fourier Transform Infrared) provides rapid, simultaneous multi-component gas analysis. Process applications: refinery gas (H2, CO, CO2, CH4, C2+), ammonia plants, ethylene production, automotive exhaust, and stack emissions. FTIR offers: wide dynamic range (ppm to %), multi-component capability (10+ gases simultaneously), no consumables, and fast response (seconds). Implementation: extractive systems with heated cells or cross-stack in-situ. Considerations: water vapor interference (requires sample conditioning or spectral subtraction), calibration with reference spectra, and data interpretation complexity. Increasingly used for continuous emission monitoring.