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    STUDIA CHEMIA - Issue no. 4 / 2013  
         
  Article:   KINETICS OF CARBON DIOXIDE ABSORPTION INTO NEW AMINE SOLUTIONS.

Authors:  MIHAELA DRǍGAN, SIMION DRĂGAN. 		 
       
         
  Abstract:   The absorption of CO2 into activated carbonate buffer solutions is the main process applied in the existing ammonia plants. The major draw back of this process is the high endothermicity of the regeneration step. Therefore, new chemical solvents must be introduced having not only high absorption rate and capacity but also low heat of regeneration. The objective of this work was to study the kinetics of CO2 absorption into aqueous solutions of ethylenediamine (EDA). A thermo regulated constant interfacial area gas-liquid reactor has been used to measure the carbon dioxide absorption rates into this aqueous amine solution (3% mol) in the temperature range 298 – 333 K. The experimental results have been interpreted using the equations derived from the two film model. The enhancement factor was always greater then 3. The pseudo-first order rate constant derived from the experimental data was of the same order of magnitude as for absorption into mixtures of MEA and MDEA.

Keywords: carbon capture, ethylenediamine (EDA), Lewis absorber, rate constant, enhancement factor.
 
         
     
         
         
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