Comparison of Rectification and Desorption in Packed Columns

Abstract

Substitution in Equation 1gives: logo = XtXi (7.30-,.151,,g,m+ 17!14( ) (4) Tin• accuracy of Equation 4 is shown in Table 1 by comparing t lie calculated value of a with the ratio of the vapor pressures for a series of binary mixtures at pressures ranging from 10 to 1200 mm.Deviations between the two values become appreciable only at large boiling point differences, where the value' of (1 also deviates appreciably from true relative volatility.

Absorption methods for the determination of mass transfer parameters of packing internals: A literature review

“…H 2 98 and organic compounds with limited solubilities in water (propene and toluene) have also been used. 142 Raschig rings Air O 2 in water Deed et al 143 Raschig rings Air CO 2 in water O 2 in water Landau et al 108 Raschig rings N 2 UF 6 in heavy oil Whitney and Vivian 99 Raschig rings Air O 2 in water Vivian and King 144 Raschig rings Air (saturated with water) CO 2 in water O 2 in water H 2 in water Propene in water Linek et al 39 Pall rings N 2 (saturated with water) O 2 in water Henriques de Brito et al 145 Mellapak 250.Y, 500.Y Air O 2 in water Kolev and Nakov 146 Turbo-Pack Air CO 2 in water Laso et al 3 Mellapak 10 Pall rings, Mellapak 250.Y Air CO 2 in water Laso et al 3 have warned that the solubility of CO 2 is rather high compared to that of O 2 , for example, and that the cations present in water (unless deionized) might affect the results. The liquid phase has been water in all sources, and the gas phase air or, in one case N 2 .…”

“…Several authors 97,99,146 introduced the gas into the water stream before the column from a gas cylinder, some 3,39,147 saturated the water in a tank before the experiments, while others used an absorption column. 143,144 Wang et al 55 simply mixed toluene and water in a tank at the start of the experiment since their solute is a liquid at room temperature, and then continuously added a toluene make-up into the tank, because their liquid phase was recirculated.…”

Gas-Bubble Columns for Gas-Liquid Contacting

“…)oi for the streamline region varies as the gas rate to the -0.74 power so the equation for the entire region is (H.T.U. )oi.,6= (3.8 X 10-<)¿ + 4.1 (?» » (5) Effect of Water Temperature. Variations in water temperature have been shown to cause variations in liquid-film masstransfer rates in packed columns (5, IS, 14)• To determine the effect of water temperature in a gas-bubble column, tests were made at different inlet water temperatures holding all other conditions constant.…”

“…For the hydrogen desorption experiments the compositions of the entering and leaving water streams were determined by a slight modification, of the method developed by Cooper, Christ!, and Peery (5). In this method the water composition is determined indirectly by allowing a trapped quantity of sir to come into equilibrium with the liquid stream.…”

Prediction of liquid film mass transfer coefficients in packed columns using liquid holdup

“…Data for absorption-desorption of oxygen, carbon dioxide in water, organic liquid and aqueous glycerol reported by various authors were used. These included the data of Shenvood and Holloway (1940), Deed et al (1947), Koch et al (1949), Molstad et al (1942), Vivian and Whitney (1947), Whitney and Vivian (1949), Yoshida and Koyanagi (1958) and Mangers and Ponter (1980). Curves (1) to (4) represented the data for the absorption-desorption of oxygen and carbon dioxide in water, whereas curves (5) to (9) represented the data for the absorption of carbon dioxide in aqueous glycerol solutions of different concentrations covering a viscosity range of 0.9 to 26.0 mPa.s.…”