https://pure.rug.nl/ws/files/3066501/2002ChemEngSciKumar.pdf

New absorption liquids for the removal of CO2 from dilute gas streams using membrane contactors

For the characterization of CO(2) absorption in aerated microalgal culture systems, a different approach based on K(L)a(O(2)) determination and transformation was studied. To confirm the validity of this method, the influence of reactions between CO(2) and compounds (OH(-), H(2)O, and NH(3)) present in the culture medium upon the absorption mechanism was evaluated under different physical and chemical culture conditions. Under these conditions, knowledge of the relative magnitudes of the diffusion and reaction kinetics permitted the evaluation of their relative importance. For the determination of the parameters required for the calculation of the CO(2) absorption constant, empirical correlations for K(L) (0) and a were used that had been previously verified with experimental data for O(2) absorption. Since, for the conditions studied, the absorption rate was shown to be independent of the chemical reactions taking place in the liquid phase, the K(L)a for CO(2) could be directly related to the K(L)a for O(2) by a simple factor that took into account the difference in aqueous diffusivity of the two gases. Thus, using methods developed for determining O(2) absorption in gas-liquid contactors, it is possible to adequately characterize CO(2) absorption for laboratory and pilot scale algal production systems.

Absorption of CO2 in algal mass culture systems: a different characterization approach.

High-throughput microporous tube-in-tube microchannel reactor (MTMCR) was first designed and developed as a novel gas–liquid contactor. Experimentally measured kLα in MTMCR is at least one or two orders of magnitude higher than those in the conventional gas–liquid contactors. A high throughput of 500 L/h for gas and 43.31 L/h for liquid is over 60 times higher than that of T-type microchannel. An increase of the gas or liquid flow rate, as well as a reduction of the micropore size and annular channel width of MTMCR, could greatly intensify the gas–liquid mass transfer. The interfacial area, α, in MTMCR was measured to be as high as 2.2 × 105 m2/m3, which is much higher than those of microchannels (3400–9000 m2/m3) and traditional contactors (50–2050 m2/m3). The artificial neural network model was proposed for predicting α, revealing only an average absolute relative error of <5%. © 2010 American Institute of Chemical Engineers AIChE J, 2011

High-throughput microporous tube-in-tube microreactor as novel gas–liquid contactor: Mass transfer study

Reactive absorption of CO2 in NaOH: Detailed study of enhancement factor models

https://pure.rug.nl/ws/files/14527971/2000ChemEngJVasBhat.pdf

S. Asai

Papers

Gas absorption with a two-step chemical reaction