Abstract
The aim of this work is to find the effect of the adding graphene oxide nanoparticle ands dodecyl sulfate (SDS) on the absorption rate and solubility of CO2 in mono-ethanolamine (MEA) solvent. To this end, an experimental setup was designed and constructed to measure the gas solubility in the solvent and the absorption rate during the process. The experiments were conducted at ambient temperature and initial pressure of 20 bar. The parameters analyzed in this paper included GO-NPS at 0.0375, 0.05, 0.075 and 0.1%, SDS at the same percentages, and the simultaneous effects of both additives. In each experiment, the absorption rate and solubility were calculated by recording the temperature and pressure variations in the absorption and loading chambers. The results indicated that the highest effect of GO-NPS was in the concentration of 0.05%, increasing solubility by up to 7.62%. These values for SDS were 0.075% and 8.39%, respectively. In the experiment with both additives at 0.05% and 0.075% for GO-NPS and SDS, solubility increased by 6.32% and simultaneous presence of both compounds had the greatest effect on absorption rate. Comparison of the results of mole variations suggested that addition of nanoparticles and surfactants both increased the absorption rate.
Highlights
Numerous studies have been conducted to preserve carbon dioxide at a higher efficiency and lower energy consumption [1]
It can be argued that mass transfer intensifies by increases in GO-NPs according to the effect of boundary mixture
The results show that increases in the concentration of solvent MEA up to a certain level increased CO2 gas solubility, but beyond that lowered solubility of carbon dioxide gas
Summary
Numerous studies have been conducted to preserve carbon dioxide at a higher efficiency and lower energy consumption [1]. Svante August Arrhenius (1859–1927) first discussed the effects of carbon dioxide on global warming until the present time that its concentration has reached 400 ppm due to excessive release of carbon dioxide into the atmosphere [2], and is the most important reason for the effect of greenhouse gases on global warming (IPCC 2007). Due to their high reaction rate and capacity for CO2 adsorption, amines have attracted greater interest from researchers. Lemoine et al examined solubility of carbon dioxide and hydrogen sulfide in methyl diethanolamine (MDEA) aqueous solution. They investigated carbon dioxide solubility in MDEA at 63.23 wt% and temperature of 298 K, as well
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