Study on COz Removal by Benfield Solution Using FEMLAB

The main objective of this project is to study C02 removal by Benfield solution at
various process conditions ie: atvarious temperature and concentration of lean Benfield
solution, at different concentration of diethanolamine (DEA) and at different value of
gas mass transfer coefficient, Kgco2-
Scope of study includes identification of general process description of Benfield
absorption system and chemical reactions involved, development of transport
phenomena equation that describes Benfield absorption system in mathematical form.
Then the required coefficient values are searched through literature review. Followed by
modelling using FEMLAB and documentation of FEMLAB output. Finally the results
were analyzed andjustified with existing studies.
At different temperature of lean Benfield, the rate of C02 absorption is increased
initially, but further increment of temperature caused less C02 to be absorbed. Thus for
temperature 333K, 343K and 353K the optimum temperature for this system is found at
343K. The effect of gas mass transfer coefficient, Kgco2 to amount of C02 absorption in
Benfield solution is inversely proportional. At various concentration of potassium
carbonate which are 0.0001 mol/m3, 0.02 mol/m3 and 0.06 mol/m3 the most efficient of
C02 absorption occurred at 0.02 mol/m3. The different in concentration of Amine did
not affect the system. From the results obtained it canbe concluded that the absorption
is limited by the resistance to diffusion and finite velocity of the reaction.