Abstract
The impinging stream technology is used to extract kerosene-acetic acid-water system. The effects of different structural parameters and operating conditions on the extraction efficiency and mass transfer coefficient of liquid-liquid extraction in the impinging stream reactor are studied. The results show that the extraction efficiency firstly increases and then decreases with the increase of nozzle diameter D, nozzle spacing L, impact chamber height H, acetic acid concentration ψ and inlet velocity u. The mass transfer coefficient firstly increases and then decreases with the increase of nozzle spacing, acetic acid concentration and inlet velocity, increases with the increase of nozzle diameter and decreases with the increase of impact chamber height. A dimensionless correlation is established to accurately predict the mass transfer coefficient in the impinging stream reactor. The process parameters (inlet velocity, nozzle spacing and nozzle diameter) are optimized for the extraction efficiency using response surface methodology (RSM). The order of influence of each factor on the extraction efficiency is as follows: inlet velocity > nozzle spacing > nozzle diameter. The optimal operating conditions are obtained: inlet velocity u = 2.56m/s, nozzle diameter D = 4mm, nozzle spacing L/D = 2, and the extraction efficiency is 91.27%, which is 10% higher than that of traditional stirring equipment.