Improvement of CO2 Absorption/Desorption Rate Using New Nano-Fluid

Abstract

Increasing the serious impact of the emissions of carbon dioxide (CO2) on the warming of globe and change of climate make this issue is one of the most important issues facing the world that needs to be resolved urgently. Several techniques have been used to control CO2 emissions. One of the methods that achieved good results was the chemical absorption technique using absorption solutions. Recently, nano solutions have been used. This action has received attention. However, further studies are needed to enhance the absorption/desorption of nano fluids and reduce the energy requirements for the regeneration process. In this study, the nanoparticle suspended in blend of monoethanolamine and triethanolamine are utilized as a new solvent. Ultrasonic was used to obtain good suspension of the nanoparticle into the base fluid and also to ensure high stability. The results showed that the CO2 absorption using the Nano fluid is enhanced by ~28% for Al2O3, 19% for Fe2O3 and 15% for SiO2 compared to that with using the base fluid alone. In addition, the rate of CO2 desorption was increased by 47%, 28%, and 22% using the Nano fluids of Fe2O3, SiO2, and Al2O3, respectively, compared with the desorption rate of the base fluid without nanoparticles.

Analysis of the Impact of Nanofluids on the Improvement in CO2 Absorption using Taguchi Method

“…It is clear that raising the concentration of nanoparticles increases the expected absorption rate, which is consistent with earlier research[2]. The chosen range of nanoparticles concentration had a significant influence on the CO2 absorption rate, The lack of significance of the factor on process performance is supported by the S/N and ANOVA results, where the F-value was found to be less than 1 at a significance level of 0.05, and the impact percentage was determined to be 0.05% which consistence with literatures[14,16,17].…”

“…Subsequently, research was done to determine the effect of nanoparticles on CO2 absorption rates. The CO2 ingestion rate of the solvent can be calculated by quantifying the difference in CO2 fluxes at the gas-phase absorber's inlet and output using a CO2 gas analyzer and the following formulas [14,15]:…”

“…The augmentation of stirring velocity would result in an amplification of the surface area of interaction between the fragmented gas bubbles and the surrounding liquid medium, as well as the nanoparticles. Additionally, it would intensify the random motion of particles, known as Brownian motion, hence leading to an enhancement in the rate of absorption of carbon dioxide [14,20]. In order to examine the influence of elevated stirring speed on the absorption of CO2, the graphical representation labeled as Figure 9 was shown utilizing the equation denoted as (3).…”

Intensification of Sono-Assisted CO2 Stripping/Carbon-Rich Solvent Regeneration by Fe2O3 Hydrophobic Micronized Particles

“…Alternative techniques for carbon-rich solvent regeneration have been developed, such as conventional solvent regeneration using Al 2 O 3 , SiO 2 , TiO 2 , and Fe 2 O 3 nanoparticles (NPs), MEA-based nanofluids such as SiO 2 and Sulfinol-M-based Fe 3 O 4 , and multiwalled carbon nanotubes (MWCNTs). − Low-frequency (35 kHz) bath-type ultrasonics-assisted solvent regeneration ( T = 20.15–28.15 °C) has been attempted using amine-functionalized Fe 3 O 4 NPs . The main drawbacks of using low-frequency ultrasound are CO 2 reabsorption while regenerating the solvent − and lack of data on energy demand and scalability aspects in the literature.…”