ENGINEERING AND PROCESS DEVEILOPMENT Performance Characteristics of Spray-Type Absorption

Sudden Decrease of the Dissolved Ozone Concentration in Sprays: A Mass Transfer Phenomenon?

“…The considerable difference of values for the volumetric mass transfer coefficient in both regions confirms the presence of the two regimes of transfer in the spray. This considerable rate of transfer in the first few centimetres has been reported by several studies [34][35][36]. Although they highlighted significantly higher transfer close to the nozzle, no efforts were made to characterize this region since, for most of the spraying column, it represents a negligible part of the gas-liquid system.…”

Mass Transfer in Foams

“…As the investigation of the effect of foam height was carried out in the turbulent region, the observed effects of foam height may undoubtedly be attributed to the backmixing of turbulent foam. Behavior illustrated in Figure 5 is similar to the behavior of spray columns (5).…”

“…The corrections for the mass transfer which occurred in the descending shower of liquid above the foam were made by interpolation of data taken with the same spray nozzles in the empty column. The interpolation procedure was to assume the same effect of volume of chamber as reported by Pigford and Pyle (5). Further details of this are available (7).…”

“…The mass transfer is not as effective in the present foam column as in the gas-bubble column, presumably because of the decreased mass-transfer rates due to the presence of detergent. Rates of mass transfer for foam and packed columns are in same neighborhood as for the spray columns investigated by Pigford and Pyle (5).…”

The Effect of Additives on Mass Transfer in CaCO3 or CaO Slurry Scrubbing of SO2 from Waste Gases

“…If m is estimated to be 1.0 atm-l./mol (by Figure 4), r = 0.22 atml./mol and CB' = 0.9 mmol/1. Pigford and Pyle (1951) measured values of kga and k\a for a spray scrubber using NH3 absorption and 02 desorption at 30 °C. Their measured values were corrected to make predictions for S02 absorption at 50 °C by assuming variation oí k%a and k\a with the square root of diffusivity and assuming a temperature dependence for r of +2%/°C.…”