Carbon dioxide capture from reforming gases using acetic acid modified chemical absorbents

Abstract

carbon dioxide gas is a major problem in the production of natural gas. it may also contributes to operation problems such as foaming, corrosion, high solution viscosity and fouling, thereby decreasing the plant life. this study presents experimental results on the evaluation of modified amine solution (diethanolamine, dea) for co2 absorption. in this study, the absorption capacity of this solvent was compared with traditional dea, ammonia and acetic acid (c2h4o2). experiments were carried out at 25co and 1 bar with dea concentration between 0.5m and 2m, ammonia concentration varying 1m and 6m and the concentration of acetic acid between 1wt% and 15wt%. the results showed that carbon dioxide absorption by ammonia is better than that carried out by dea and mixtures of nh3, dea and acetic acid. the most efficient absorbents (absorption capacity) were 6m nh3, 2m dea and a mixture of 6m nh3 and 1wt% acetic acid at fixed gas flow rate of 80 ml/min and liquid flow rate of 22 l/h, where the co2 removal efficiency of 94.7%, 74% and 73% was obtained, respectively.