Comparison of DEA and TEA performance for CO2 capture from synthesis gas of ammonia under different operational conditions

Abstract

Aqueous solvent of di ethanolamine and tri ethanolamine 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 carbon dioxide from synthesis gas of ammonia production. 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 between (DEA&TEA) with the least energy consumed while preserving the higher capture of CO2 from synthesis gas. Therefore, this research aims to investigate the influence of solvent rate on the efficiency of CO2 capture. Aspen hysys was employed to simulate an absorption plant and to investigate the influence of several variables on process efficiency. Increasing the amine loading 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 but the regeneration energy is directly affected by any change in the amine rates.