Determination of the Henry's Coefficient and Mass Transfer for Ozone in a Bubble Column at Different pH Values of Water

Experimental investigation of gas-liquid mass transfer of ozone in water, in bubble column with two-fluid nozzle gas distributor (BKDM), under different operating conditions, are presented in this work. The main objective was to determine the ozone volumetric mass transfer coefficient, kL a, in calm uniform section of the column, under different values of gas and liquid flow rates. Obtained values of these coefficients were compared with the values in countercurrent bubble column. The critical liquid flowrate, when gas hold up reaches its maximum, was experimentally determined. It was shown that the maximum value of the ozone volumetric mass transfer coefficient is obtained just when liquid flowrate is at its critical value.

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Determination of Equilibrium Constants for Reactions between Nitric Oxide and Ammoniacal Cobalt(II) Solutions at Temperatures from 298.15 to 309.15 K and pH Values between 9.06 and 9.37 under Atmospheric Pressure in a Bubble Column

Industrial & Engineering Chemistry Research ◽

10.1021/ie302439u ◽

2013 ◽

Vol 52 (10) ◽

pp. 3663-3673 ◽

Cited By ~ 8

Author(s):

Hesheng Yu ◽

Zhongchao Tan

Keyword(s):

Nitric Oxide ◽

Atmospheric Pressure ◽

Bubble Column ◽

Equilibrium Constants ◽

Ph Values

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Mass Transfer Studies in a Novel Perforated Plate Bubble Column

International Journal of Chemical Reactor Engineering ◽

10.2202/1542-6580.2340 ◽

2010 ◽

Vol 8 (1) ◽

Author(s):

S. Dhanasekaran ◽

T. Karunanithi

Keyword(s):

Mass Transfer ◽

Liquid Velocity ◽

Bubble Column ◽

Perforated Plate ◽

Gas Velocity ◽

Plate Spacing ◽

Mass Transfer Studies ◽

Superficial Gas Velocity ◽

Superficial Liquid Velocity

This investigation reports the experimental and theoretical results carried out to evaluate the volumetric mass transfer coefficient (kLa) in a novel hybrid rotating and reciprocating perforated plate bubble column. Countercurrent condition is performed. kLa is studied by the absorption of oxygen from air into deoxygenated water at room temperature (27 ± 1°C). Effects of agitation level, superficial gas velocity, superficial liquid velocity and plate spacing on kLa were analyzed and found to be significant. With an increase in agitation level at a constant superficial gas and liquid velocities, the breakage process of gas bubbles starts to be more pronounced and intensive oxygen mass transfer occurs. Hence, kLa increases sharply. kLa increases with an increase in superficial gas velocity, due to higher gas holdup and the enhanced breakup of bubbles. Similarly, kLa increases with an increase in superficial liquid velocity and the effect is found to be significant. When plate spacing is decreased (by increasing the number of plates), it is observed that the kLa increases at higher superficial gas velocity and agitation level. Correlation is developed for the determination of kLa and found to concur with experimental results. This correlation can be used for the determination of kLa for this hybrid column with 95% accuracy within the range of variables investigated in this present study.

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