Modelling study of the optimal operation conditions of CO2 capture from natural gas using activated Methyldiethanol amine.

Aqueous solvent of Piperazine activated MDEA has been the focus of research over the last decade because of the desire to obtain more efficient and economical chemical absorption solvent to eliminate acid gases from natural gas. As well as being the promising technology which could be employed to control and reduce carbon dioxide emissions from fuel gas. However, the substantial disadvantage of this technology is high energy requirements. Though, the main objective facing this process is to select the most efficient and appropriate amine solvent with the least energy consumed while preserving the higher capture of CO2. Therefore, this research aims to investigate the influence of Piperazine on the efficiency of acid gases capture. Aspen plus was employed to simulate an absorption plant and to investigate the influence of several variables on process efficiency. Increasing Pz concentration rises the efficiency of absorption process, but till a particular limit. Similarly, increasing amine circulation rate rises the absorption process efficiency as long as below the equilibrium rate. Increasing lean amine temperature was found to affect the absorption process negatively, exactly contrary to the behavior of pure MDEA. Finally, the regeneration energy is directly affected by any change in the mentioned operating factors.