Effects of surface active agents on hydrodynamics and mass transfer characteristics in a split-cylinder airlift bioreactor with packed bed

Hydrodynamics and oxygen mass transfer characteristics of petroleum based micro-emulsions in a packed bed split-cylinder airlift reactor

“…Three independent parameters involving surface tension (σ), density (ρ) and viscosity (v) affect the micro-emulsions properties in an unpacked airlift reactor (Moraveji et al, 2012b).…”

Liquid–solid mass transfer behaviour of a fixed bed airlift reactor

“…Previous studies have shown that the presence of packed bed in airlift reactors increases gas holdup and the degree of turbulence inside the bed [2], this effect tends to increase the rate of mass transfer via thinning the developing diffusion layer at each ring to a degree depending on ring diameter. The larger the ring diameter the higher the mass transfer coefficient; a possible explanation for this fact is that as the ring diameter and bed porosity decreases, the number of entrapped gas bubbles surrounding each ring increases to the extent that they obstruct the diffusion of the reacting ions to the ring surface with a consequent decrease in the rate of mass transfer.…”

“…Previous studies have used fixed beds only to improve the rate of gas-liquid mass transfer [2][3][4][5][6][7] but no study has been reported on liquid-solid mass transfer at fixed bed in airlift reactors. As far as we know two previous studies on liquid-solid mass transfer in airlift reactors deserve to be mentioned.…”

“…Previous studies on airlift reactors [2][3][4][5][6][7] have concentrated on the hydrodynamic aspects and gas-liquid mass transfer especially mass transfer of O 2 in aqueous solutions in relation to biochemical processes. Little has been done on the liquid-solid mass transfer behaviour of such reactors despite the importance of the subject in case of liquid-gas-solid catalytic reactions which are controlled by the liquid-solid mass transfer step.…”

Modeling of Mass Transfer in an Internal Loop Airlift Reactor

“…A well‐designed airlift reactor is expected to have the maximal mass transfer rate, with efficient mixing, but at minimal energy input 6. In recent decades, lots of studies have been carried out to investigate mass transfer characteristics of airlift reactors under different experimental conditions 7–11, where the volumetric mass transfer coefficients were used as the dominate index to evaluate the mass transfer capability. Although these studies provided much useful quantitative information about the mass transfer performance of airlift reactors, they did not unfold the dynamical mass transfer process in airlift reactors.…”