Print ISSN: 1681-6900

Online ISSN: 2412-0758

Keywords : carbon dioxide


The Effect of Surfactant Concentration on the Rate of CO2 Absorption by Carbonate Solution in Packed Tower

Fadil H. Faraj; Alyaa K. Mageed

Engineering and Technology Journal, 2009, Volume 27, Issue 6, Pages 1134-1142

Absorption of carbon dioxide from gaseous mixture (carbon dioxide, air) was
studied by using Carbonate Solution (Na2CO3) in a counter-current packed column (7.5 cm
id, 1.70 m height), packed with glass rashing rings of 1.8 cm i.d to a depth of 1.1 m.
The effect of Surfactant concentration (dodecyl benzene sulfuric acid sodium
(DBS))(0.5, 1.5, 2.5gm/lit.), gas mass flux (0.05, 0.075, 0.1 kg/m2.sec) and liquid mass flux
(kg/m2.sec) on the absorption rate of carbon dioxide and mass transfer coefficient was
studied at constant carbonate concentration (0.3 kmol/m3), inlet carbon dioxide
concentration(0.08, Y2=0.086 mol CO2/mol air), ambient temperature and atmospheric
pressure. The results show that the absorption rate tends to increase with increasing gas and
liquid flow rate. Mass transfer coefficient (KG.a) increases with increasing liquid flow rate
and slightly change with increasing gas flow rate. Increasing surfactant concentration
(decreasing surface tension) leads to decrease the absorption rate and mass transfer
coefficient.

Redlich-Kwong Equation of State Used For Prediction phase Data

Dhia Aldeen M. Kassim

Engineering and Technology Journal, 2008, Volume 26, Issue 7, Pages 747-752

The solubility of CO2 in the non-volatile compounds of n-Hexadecane,
Diphenylmetnane, Diphenyl ethane, Ethyl benzene and of Nitrogen in n-
Hexadecane, at temperature range 298.15-358.15 K are measured at partial
pressure of one atmosphere, Falling-film flow technique was used in the present
experimental work.
It is seen that in most cases the solubility is decreased at the temperature
increased, though in the case of the Nitrogen/n-Hexadecane system the reverse is
true. The effect is probably related to the decrease in solvent density which occurs
as the temperature raises. For systems of low Solubility ,this effect tends to counter
balance the increase tendency for solute molecules to "escape" from the solvent,
arising from their increase kinetic energy . In addition ,the binary interaction
constant (LAB) was calculated by fitting the mole fraction solubility of solute gases
CO2 and N2 by using Redlich-Kwong equation of state for predicting phase data.
The interaction constant LAB was calculated from the following expression:
= 1− ( )−0.5 ...........(1) AB AB A B L a a a