Optimization of a novel measurement technique for the simultaneous measurements of gaseous and liquid species compositions and phase volume fraction

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Multiphase processes (i.e., gas-solid, liquid-solid, gas-solid, and gas-liquid-solid) have been commonly employed in many industries in such areas as chemical, petrochemical, pharmaceutical, energy, pulp and paper, and food. Theses systems can be characterized through the measurements of chemical species composition and phase volume fraction to arrive at the successful control, optimization, and troubleshooting in the industries and laboratories. These two parameters are dependent while coupled through the system hydrodynamics and reaction kinetics. The hydrodynamics of multiphase systems are often characterized by different regions of varying solids concentration and the species composition. In addition, in a reactive system, solids volume fraction influences chemical reaction through heterogeneous catalytic and/or inhibitive effects. In the case of a gas-liquid-solid fluidized bed, the simultaneous measurement of volume fractions of different phases was considered problematic with the help of a single measurement technique principally due to the difficulties in differentiating between the signals from solids and the bubbles. Therefore, the simultaneous and in-situ measurements of gas/liquid species composition and the volume fraction of different phases are critical to the multiphase process characterization.