Quantitative Analysis of Process Streams by On-Line FT-IR Spectrometry

Abstract

Current efforts in the Process Analytical Chemistry and Control Technology group at Bell Laboratories, Lucent Technologies, have focused on the development of an online method for real-time characterization of organiccontaining effluents (principally trimethyamine (TMA) and methanol) produced during a high-temperature processing. On-line analysis of the gas streams was performed by combining FT-IR spectrometry with partial least squares (PLS) to obtain quantitative information for process control. The gas-phase infrared spectra were measured at a resolution of 16 cm -1 under atmospheric conditions. The correlation coefficients for all the components including water were larger than 0.999, and the standard errors of prediction were much less than 1% by weight. The effect of CO 2 on the predictability of other components is discussed. Results of our experiment showed that the predicted errors for TMA and methanol increased by as much as 10 and 15%, respectively, as the amount of CO 2 increased to 100% of the most intense absorption peak in the spectra.

Fourier Transform Infrared Absorption Spectroscopy for Quantitative Analysis of Gas Mixtures for Homeland Security Applications

“…This criterion is met in the present referee method, which makes an absorption measurement of the gas using a commercial Fourier transform infrared (FT-IR) absorption spectrometer. FT-IR spectroscopy has been utilized previously for quantitative analysis of gasphase components, using a variety of approaches (see, for example, [3][4][5][6][7]). The method that we demonstrate relies upon the use of primary reference spectra from available spectral libraries, thus providing quantitative concentration measurements with defined levels of uncertainty.…”

“…These analytes are often reactive under typical background atmosphere environments that include varied temperatures and humidity levels. The testing parameters for validation of chemical detectors include temperature and humidity parameters for challenge streams that have been defined by recently published Quantitative FT-IR Spectroscopy of TIC Test Gases [5] chemical vapor detector standard specifications [1,2]. The testing conditions are shown in Table 1 with the acceptable ranges for the temperatures and humidities [1].…”

Nickel-Palladium Nanoparticles for Nonenzymatic Methanol Detection

“…Traditionally, detection of methanol is accomplished by Fourier transform infrared (FTIR), chromatography and electrochemical methods (Bangalore et al 1994;Qin and Cadet 1997;De Paula et al 1999). Electrochemical techniques are the most popular due to high sensitivity, rapid turnaround, and low cost and most electrochemical methods utilize enzyme electrodes (Liu and Kirchhoff 2007;Wu et al 2007; Guo and Dong 1997;Zhang et al 1999;Konash and Magner 2005).…”

An electrochemical methanol sensor based on a Pd–Ni/SiNWs catalytic electrode

“…Thus far, the majority of methods developed for methanol quantification include spectrophotometry [1], chromatography [2], electrochemistry [3], etc. Among these, the electrochemical method, which uses current signal to quantify the methanol concentration [3][4][5], is regarded as a promising strategy. Currently, research is primarily focused on the development of novel electrode materials that can electro-catalyze methanol easily and effectively [6][7][8][9].…”