چكيده به لاتين
Due to the widespread use of carbon dioxide in various industries and also reducing greenhouse gases, several processes for separating carbon doxide from a mixture of gases are available that the most notable one is “absorption”. Different technologies have been developed for the gas absorption process, such as packed bed columns, mechanical agitator, membrane contactor etc. Nonetheless, there are some drawbacks and limitations in the current absorption technologies. Therefore, it is necessary to provide an alternative absorption technology that does not have these limitations or at least minimizes them. For this purpose, an experimental setup was designed and built with high-frequency ultrasonic wave (1.7 MHz) for absorption. By applying high-frequency ultrasonic waves, very small droplets were pinched out by the strong vibration on the gas-liquid interfacial. Thus small droplets provided a large surface area for the mass transfer process. Technically, this phenomenon is called Atomization. In this study, carbon dioxide absorption was investigated in DEA, Na2CO3, NaOH and water. Obtained results indicated that the absorption rate was being increased up to 20 times as compared with the case without ultrasonic irradiation at 8.64 watts. A magnetic stirrer was replaced by the ultrasonic piezoelectric transducer to better analyze the effect of high-frequency ultrasonic waves on absorption and to compare it with other methods. The mass transfer coefficient by the ultrasonic system was approximately 4.4 times more than the magnetic stirrer at 600 rpm in the water which indicates the better performance of the ultrasonic system to the stirrer. The effect of four parameters of temperature, pressure, concentration, and power on the carbon dioxide absorption rate was studied by using the Box–Behnken design. The power and temperature had the most and least effect on the selected parameter, respectively. According to the significant obtained results and benefits, it can be acknowledged that absorption through this method can be expanded as a possible option for the carbon dioxide capture process.
Keywords: Carbon dioxide, Greenhouse gases, Absorption, Ultrasonic waves and High frequency.
