Effect Of Adsorptive Particles And Contamination On CO₂ Absorption Process

The effect of fine particle on gas-liquid mass transfer has received increasing attention, and become an important interest in chemical process intensification. In this paper, the physical absorptions and mechanism of CO2 into slurry containing activated carbon particles and fouled by fingerprint were studied.The absorption of CO2 into aqueous slurry of activated carbon and an aqueous solution of fingerprint contamination were carried out in a stirring reactor with volume of 0.8L. The influence of contaminated time ranging from 0.25 to 5min, initial pressure from 0 to 0.2MPa, stirring speed from 0 to 210min-1, solid loading from 0 to 1 kg·m-3 and particles diameter from 3 to 300μm at 298.15±0.5 K on CO2 absorption rate had been investigated experimentally.There was an obvious negative effect on CO2 absorption into water by fingerprint contamination. Mass transfer was intensified by adding activated carbon especially smaller diameter particles. Enhancement factor increased in closely linear under lower solid loading and came up to a constant when particle content reached certain value Enhancement factors at different initial pressures were determined under particle diameter 3μm, solid loading 0.15 kg·m-3 and stirring speed 120min-1. The results show that enhancement factor firstly increased and then reduced with initial pressure. At constant particle loading, the enhancement factor increased with stirring speed under lower stirring intensity (<90min-1) but decreased under higher (>150min-1).A novel one-dimensional model of enhancement factor was proposed by dividing interfacial region into particles-covered and uncovered zones in slurry containing activated carbon fine particles on the basis of earlier researches. The calculated values were in good accordance with experimental data which validate the model proposed.