Spray- and Bubble-Type Absorption of Acetone from Air into Water in a Two-Impinging-Jets Absorber

Spray- and bubble-type absorption of acetone from air into water was conducted by applying the method of impinging streams, which has proven to be very efficient. Two two-phase critical nozzles (Caldyn CSL 2) were used. The nozzles were positioned on the same axis and sprayed the gas-liquid mixture against each other. It was found that for identical gas and liquid flow rates the mass-transfer coefficients, K_Ga, vary in the range 0.3-15.4 s^-1for the spray absorber and 0.5-21 s^-1for the bubble absorber. The K_Ga's were correlated in dimensionless groups. The typical two-maxima behavior of the absorption rate (or K_Ga) against the internozzle distance was found in this case as in a previous investigation. This phenomenon is attributed to two distinct enhancing effects inherent to the impinging of liquid-gas mixtures. The first maximum is due to secondary droplets splitting in the impingement zone, and the second maximum is the result of an increase in the residence time due to the oscillatory motion of individual droplets in the impingement zone.