Experimental Study On The Removal Of CO₂ From Natural Gas By Nanoparticle-MDEA Main Absorbent

In the industrial treatment of CO₂ removal from natural gas,the development of the next generation of novel amine absorbents with better performance is the key field of formulation optimization.Nanofluids have attracted wide attention in this field due to their good mass transfer enhancement performance.It is of great significance to study the stability,absorption and desorption properties of nanofluids for absorbent selection,operation parameters optimization,process design and energy saving.In this paper,the stability,absorption and desorption properties of nanofluids were studied by experiments.The absorption and desorption properties of nanofluids under different factors were measured by natural gas decarburization experimental system,and the stability of nanofluids under different conditions was comprehensively analyzed.The results showed that in the absorption process,when MDEA-H₂O was used as the amine solution,the absorption enhancement factors of the absorbents added with nano-Ti O₂,Al₂O₃ and Si O₂ particles were all greater than 1,that is,nano-particles played a role in strengthening the absorption.The optimal absorption enhancement factors of the three nanofluids first increase and then decrease with the addition of particle solid content,and the peak values correspond to the optimal addition of particle solid content,which are 0.08%,0.10%and 0.10%,respectively.At the same time,with the increase of particle size,the absorption enhancement factor decreases.During the desorption process,nano-particles inhibited the desorption rate of amine absorbent,and nano-Al₂O₃ had the lowest inhibition effect.The stability of nanofluids decreases with the increase of solid content.The stability peak of nanofluids prepared by different nanoparticles corresponds to different optimal ultrasonic oscillation time.Both absorption and desorption processes decrease the stability of nanofluids.The desorption temperature of nanofluids decreased by 15°C still had better desorption performance,which effectively reduced energy consumption.