Mass Transfer Modeling of CO2 Absorption into Blended Aqueous MDEA–PZ Solution

Document Type: Research Paper

Authors

1 M.S. Student, School of Chemical, Petroleum, and Gas Engineering, Iran University of Science and Technology, P.O. Box 16846-13114, Tehran, Iran

2 Associate Professor, School of Chemical, Petroleum, and Gas Engineering, Iran University of Science and Technology, P.O. Box 16846-13114, Tehran, Iran

Abstract

In this research, the rate of CO2 absorption into methyl diethanolamine–piperazine (MDEA–PZ) solution was investigated. To model the mass transfer flux in the reactive absorption processes, the dimensionless parameters of the process were obtained using the Buckingham Pi theorem and considering the effective parameters in mass transfer. The CO2 mass transfer flux in the reactive absorption process depends on the mass transfer parameters of both the liquid and gas phases. Based on the dimensionless parameters obtained, a correlation is proposed to calculate the mass transfer flux of acidic gases in MDEA–PZ solutions. The mass transfer flux in the reactive absorption process is modeled based on the four laws of chemical equilibrium, phase equilibrium, mass balance, and charge balance. Experimental data from the literature were used to determine the constants of the derived correlation as a function of dimensionless parameters. In the provided correlation, the effects of dimensionless parameters including film parameter, CO2 loading, ratio of diffusion coefficients in the gas–liquid phase, CO2 partial to total pressure, and film thickness ratio as well as factors such as temperature, the number of free amines in the solution, the partial pressure of CO2, on the CO2 mass transfer flux were investigated. According to the results, the absorption rate decreases with increasing CO2 loading and film parameter, and the mean absolute deviation is about 3.6%, which indicates the high accuracy of the correlation.

Highlights

  • The rate of CO2 absorption into methyl diethanolamine-piperazine (MDEA-PZ) solution is investigated.
  • The dimensionless parameters of the process are obtained using the Buckingham Pi theorem and considering the effective parameters in mass transfer.
  • The CO2 mass transfer flux in the reactive absorption process depends on the mass transfer parameters of both the liquid and gas phases.
  • Based on the dimensionless parameters obtained, a correlation is proposed to calculate the mass transfer flux of acidic gases in the MDEA–PZ solutions.
  • The mass transfer flux in the reactive absorption process is modeled based on the four laws of chemical equilibrium, phase equilibrium, mass balance, and charge balance.

Keywords

Main Subjects


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