Agitated vessels absorption

Agitated vessel Complete mixing Integral Liquid Absorption... 

The choice of a bubble column or an agitated vessel depends primarily on the solubihty of the gas in the liquid, the corrosiveness of the liquid (often a gas compressor can be made of inexpensive material, whereas a mechanical agitator may have to be made of exotic, expensive materials), and the rate of chemical reac tion as compared with the mass-transfer rate. Bubble columns and agitated vessels are seldom used for gas absorption except in chemical reac tors. As a general rule. 

Hikita, H. and Ishikawa, H., 1969. Physical absorption in agitated vessels with a flat gas-liquid interface. Bulletin of the UniversityOsaka Prefect, A18, 427-437. 

The absorption rates of CO2 were measured in such non-aqueous solvents as toluene, NMP, and DMSO with GMA concentration ranging Ifom 0.5 to 3 kmol/m in a semi-batch flat-stirred agitated vessel constructed of pyrex glass of 0.075 m inside diameter and of 0.13 m in height. The apparatus and the experimental procedure are the same as those described by... 

Ayerst, R. R. and Herbert, L. S. Trans. Inst. Chem. Eng. 32 (1954) S68. A study of the absorption of carbon dioxide in ammonia solutions in agitated vessels. 

This dependence of kL on Pm/v was also reported by Prasher and Wills (1973) based on the absorption of C02 into water in an agitated vessel, as follows ... 

For gas absorption, the equipment possibilities are generally packed columns plate distillation towers, possibly with mechanical agitation on every plate deep-bed contactors (bubble columns or sparged lagoons) and mechanically agitated vessels or lagoons. Packed towers and plate distillation columns are discussed elsewhere. Generally these... 

The objective of absorption equipment is to provide intimate contact between the liquid concerned and gas, thus facilitating the absorption process. When a large volume of gas is absorbed per unit volume of liquid, a marked rise in temperature may result and devices for the removal of the heat evolved are then an important feature of the equipment. Apart from packed towers, the types of equipment described here include agitated vessels, bubble-plate towers, cooler-absorbers and spray towers. 

Perez and Sandall (1974) studied the absorption of carbon dioxide in aqueous carbopol solution. The rheological behavior of the solution was described by the power law model with flow behavior indices varying from 0.91 to 0.59. For an agitated vessel with a turbine impeller, the mass-transfer coefficient across the unbroken interface was correlated as... 

The methods for both semi-batch and continuous reactors are generally restricted to the 02-aqueous system because of the limitations of the analytical technique for the direct measurement of liquid-phase concentration. Novel agitated vessels for measurement of transient absorption rates are described by Danckwerts and Kennedy (1954), Oishi et al. (1965) and Govindam and Quinn (1964). 

Yagi II.. Yoshida F., Gas Absorption by Neivtonian and bfon-Neivtonian Fluids in Sparged Agitated Vessels, Ind. Eng. Chem. Process Des. Dev. 14 (1975) 4, p. 488-493... 

Bubbles. Mass transfer between gas bubbles and a liquid phase is oF importance in a variety of operations—gas-liquid reactions in agitated vessels, aerobic reimamaiions, aed absorption or distillation in tray columns. As in liquid-liquid transfer, dispersion of a phase into small units greatly increases tha avtalable area for transfer. If the fractional holdup (volume gas/total volume) of the gas in a gas-liquid mixture is Hs, the imerfacial area par unit volume for bubbles of diameter dB is given by... 

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