Attenuated total reflection infrared difference spectroscopy (ATR-IRDS) for quantitative reaction monitoring.
Monitoring of chemical reactors is key to optimizing yield and efficiency of chemical transformation processes. Aside from tracking pressure and temperature, the measurement of the chemical composition is essential in this context. We present an infrared difference spectroscopy approach  for determining the reactant (cyclooctene) and product (cyclooctane) concentrations during a catalytic hydrogenation reaction in the solvent cyclohexane, which is present in large excess. Subtracting the spectrum of the pure solvent from the reactor mixture spectra yields infrared (IR) spectra,  which can ultimately be evaluated using a curve-fitting procedure based on spectral soft modeling. An important feature of our evaluation approach is that the calibration only requires recording the pure component spectra of the reactants, products, and solvent. Hence, no time-consuming preparation  of mixtures for calibration is necessary. The IR concentration results are in good agreement with gas chromatography measurements.
School of Engineering, University of Aberdeen, Scotland, UK. j.kiefer@abdn.ac.uk
Johannes
J
Kiefer
Melek A
MA
Cöngevel
Daniel
D
Roth
Katharina
K
Obert
Peter
P
Wasserscheid
Alfred
A
Leipertz