Abstract
Chemical absorption is the most common technology used for the process of CO2 removal from natural gas due to its ability to reduce the level of the acid gas to a very low level as well as higher mass transfer performance due to the chemical kinetic reaction. Higher solvent concentration resulted in higher capacity to remove CO2, however reduces the diffusivity as well as its ability to spread on the packing due to its high solvent viscosity. This has hindered the used of high viscosity solvent in the operation of conventional packed column. However, recent technology of using high frequency ultrasonic irradiation for absorption process has shown possibility to operate high viscosity solvent due to the absence of packing in the reactor. From this work, it is shown that high viscosity solvent does not affect the mass transfer performance under ultrasonic irradiation due to the presence of acoustic streaming, fountain and atomization that reduced the film resistance thus increases the diffusivity. This work has demonstrated that this technology has high flexibility of solvent selection for the absorption process.
Highlights
In the chemical absorption process, CO2 gas is removed from natural gas by reacting with chemical solvent and form intermediate compounds
For packed column operation, the use of high viscosity solvent resulted in decrease of absorption performance due to the reduced in turbulence on the packing surface as well as lower solvent ability to spread on the packing [12, 13]
The high solvent viscosity resulted in the lower liquid flow rate and low mixing effect
Summary
In the chemical absorption process, CO2 gas is removed from natural gas by reacting with chemical solvent and form intermediate compounds. The increase in MEA concentration resulted in the increase of the solvent viscosity This affects the mass transfer performance of the absorption process due to slower diffusion of amine from the bulk solvent to the gas-liquid interfacial area and slower diffusion of the gas to the reactive boundary layer. A new technology of using high frequency ultrasonic irradiation has shown higher CO2 absorption performance as compared to the packed column [4, 1517] This technology successfully enhanced the mass transfer process due to the physical effects of ultrasonic irradiation that increases the gas-liquid interfacial area without having any packing in the column. In this work, the effect of MEA concentration on the mass transfer performance of CO2 absorption using high frequency ultrasonic irradiation in a continuous system is reported
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