Experimental study of a trickle-bed reactor operating at high pressure: two-phase pressure drop and liquid saturation

Abstract The effect of pressure on the hydrodynamics of trickle-bed reactors is investigated. The two-phase pressure drop and the liquid hold-up (liquid RTD determination) were measured for pressures up to 8.1 MPa. The influence of pressure, gas and liquid flow rates, viscosity, the coalescence behaviour of the liquid, and the particle size was examined. The experimental results were compared to correlations from the literature and two new correlations for the pressure drop and the liquid hold-up for non-foaming liquids are proposed; they are based on 1500 experimental results. Consideration of systems exhibiting non-foaming behaviour shows that the two-phase pressure drop is correctly described by the introduction of the modified Lockhart and Martinelli parameter. The liquid saturation data analysis shows that this hydrodynamic parameter is pressure-independent for very low gas superficial velocities allowing for an acceptable estimation at atmospheric pressure.

[1]  Gabriel Wild,et al.  A new, improved liquid hold-up correlation for trickle-bed reactors , 1990 .

[2]  R. Kelly,et al.  Experimental methods for measuring static liquid holdup in packed columns , 1986 .

[3]  J. Turpin,et al.  Prediction of pressure drop for two‐phase, two‐component concurrent flow in packed beds , 1967 .

[4]  Klaas R. Westerterp,et al.  The influence of pressure on the liquid hold-up in a cocurrent gas-liquid trickle-bed reactor operating at low gas velocities , 1991 .

[5]  Vito Specchia,et al.  Pressure drop and liquid holdup for two-phase concurrent flow in packed beds , 1977 .

[6]  André Laurent,et al.  A new, improved pressure drop correlation for trickle-bed reactors , 1988 .

[7]  Ka Ming Ng,et al.  A model for flow regime transitions in cocurrent down‐flow trickle‐bed reactors , 1986 .

[8]  Y. Varma,et al.  Flow pattern of the phases and liquid saturation in gas‐liquid concurrent downflow through packed beds , 1988 .

[9]  N. Midoux,et al.  FLOW PATTERN, PRESSURE LOSS AND LIQUID HOLDUP DATA IN GAS-LIQUID DOWNFLOW PACKED BEDS WITH FOAMING AND NONFOAMING HYDROCARBONS , 1976 .

[10]  Milorad P. Dudukovic,et al.  Convolution and deconvolution of nonideal tracer response data with application to three-phase packed-beds , 1989 .

[11]  Blok,et al.  HYDRODYNAMICS AND MASS-TRANSFER IN PULSING TRICKLE-BED COLUMNS , 1982 .

[12]  R. Lockhart Proposed Correlation of Data for Isothermal Two-Phase, Two-Component Flow in Pipes , 1949 .

[13]  V. G. Pangarkar,et al.  Liquid holdup and dispersion in packed columns , 1990 .

[14]  P. S. T. Sai,et al.  Pressure drop in gas‐liquid downflow through packed beds , 1987 .