Experimental Study of Oxygen Mass Transfer Coefficient in Bubble Column with High Temperature and High Pressure

Abstract

The volumetric gas-liquid mass transfer coefficient, k L a, for oxygen was studied by using the dynamic method in slurry bubble column reactors with high temperature and high pressure. The effects of temperature, pressure, superficial gas velocity and solids concentration on the mass transfer coefficient are systemically discussed. Experimental results show that the gasliquid mass transfer coefficient increases with the increase in pressure, temperature, and superficial gas velocity, and decreases with the increase in solids concentration. Moreover, k L a values in a large bubble column are slightly higher than those in a small one at certain operating conditions. According to the analysis of experimental data, an empirical correlation is obtained to calculate the values of the oxygen volumetric mass transfer coefficient for a water-quartz sand system in two bubble columns with different diameter at high temperature and high pressure.

Hydrokinetic optimization of commercial scale slurry bubble column reactor

“…The authors include a vast list of prior studies of mass transfer coefficients in ambient bubble columns. Similar directional temperature and pressure effects on k L a were concluded by Jin et al7 In addition, a decreasing k L a was discovered as loading of solids increased. This confirms other researchers' findings about the reduction of bubble size with increased levels of solids.…”

Gas–Liquid Mass Transfer Characteristics in a Gas–Liquid–Solid Bubble Column under Elevated Pressure and Temperature

“…The liquid phase volumetric mass transfer coefficient k L a was determined by means of a dynamic absorption technique [3,13]. First the system temperature and system pressure were elevated to given values.…”

“…Gas components of the inlet and outlet are analyzed by means of gas chromatograph (H 2 ) and infrared analyzer (CO, CO 2 ). The holdups and the rising velocity for the small bubble swarm and large bubble swarm are determined using the differential pressure method and dynamic gas disengagement (DGD) method [3,13].…”

Bubble column reactors for high pressures and high temperatures operation

“…Literature results show that the effect of pressure on k L is not predominant because, even when k L decreases or remain constant, k L a still increases ( Jin et al (2004) studied the effect of temperature on k L a L in a wide temperature range (from 298 to 473 K) and for three pressures (1, 2 and 3 MPa). They showed that k L a L increases with temperature for the three pressures.…”