| Summary: | 碩士 === 中原大學 === 化學工程研究所 === 80 ===
The solubility data of CO2 or H2S in aqueous mixtures of monoethanol-amine (MEA) and methyldiethanolamine (MDEA) have been measured at 40, 60, 80, and 100°C. The aqueous systems studied are 30 wt% MEA, 24 wt% MEA + 6 wt% MDEA, 18 wt% MEA + 12 wt% MDEA, 12 wt% MEA + 18 wt% MDEA, 6 wt% MEA + 24 wt% MDEA, and 30 wt% MDEA. The partial pressures are from 1 kPa to 2000 kPa and 1 kPa to 500 kPa for CO2 and H2S, respectively.
The equilibrium solubility of CO2 in aqueous mixtures of MEA with MDEA has been correlated based on the model of Kent and Eisenberg. Sat-isfactory results were obtained for the systems tested. When performing the equilibrium solubility calculations for the data which are not included in the data base, the model predicts the equilibrium solubility of carbon dioxide in aqueous MEA/MDEA solutions reasonably well.
Using the wetted-wall column, the reaction kinetics data of CO2 with 2-amino-2-methy1-1-propanol (AMP) and of CO2 with 2-piperidineethanol (PE) aqueous systems have also been studied. The reactions were found to be first order with respect to both CO2 and the amine AMP or PE, respectively. The second-order forward rate constant had a value of 1270 m3/(kmol s) within the AMP concentration range 0.258∼3.0 kmo1/m3, and 195 m3/(kmol s) within the PE concentration range 0.218∼1.0 kmo1/m3. Based on the N2O analogy, the product of the diffusivity and solubility for CO2 in AMP and in PE solutions, D1/2A/He, were found by absorbing N2O into the AMP and PE solutions within the above concentration range.
The vapor-liquid equilibrium data of CO2 and H2S in MEA/MDEA aqueous solutions and the CO2./amines kinetics dataa measured in the work provide valuable informations for efficient design of units involving in acid gas treating process.
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