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Experimental studies determining mass transfer coefficient in high-pressure absorber packed columns

https://doi.org/10.1039/C7RA01352C

“In the previous section, we reviewed the experimental studies for determining KGCO2aV in low-pressure absorber packed columns. The evaluation of the KGCO2aV coefficient under high pressure is essential for removing CO2 from natural gas streams. Few studies are available in the literature for determining KGCO2aV in high-pressure absorber packed columns.

Abdul Halim, et al.62 performed experiments in order to remove CO2 from a mixture of CO2 and methane using an MEA solution under a pressure of 50 bar. The experiments were performed in a packed column (packing height 2.04 m; column diameter 0.046 m) with a packing type of Sulzer gauze, which has a surface area of around 500 m2 m−3. The aim of their work was to determine KGCO2aV and the CO2 removal efficiency under high pressure. The KGCO2aV values were obtained at a fixed CO2 concentration of 20% mol, an amine concentration range of 1–4 kmol m−3, an amine flow rate range of 4.51–8.1 m3 m−2 h−1, a gas flow rate range of 18.89–35.08 kmol m−2 h−1, and feed temperature range of 27 °C to 45 °C. They validated their experiments’ reliability by the work of Maneeintr, et al.79 under low-pressure conditions. Their results indicated that high pressure, amine flow rate, and amine concentration had a significant effect on KGCO2aV, and that by increasing these parameters, the KGCO2aV values would increase. They also showed that the KGCO2aV values were unaffected by the gas flow rate and that the optimal point for the temperature of the inlet amine to the absorption column was found to be 40 °C. Halim, et al.80 performed their experiments for removing CO2 from a mixture of CO2 and methane using an AMP–PZ solution in a packed column (packing height 2.04 m; column diameter 0.046 m) with a packing type of Sulzer gauze. The aim of their work was to determine the KGCO2aV values under high pressures (10–40 bar). The KGCO2aV values were obtained at a fixed CO2 concentration of 40% mole, a total amine concentration of 30% wt (PZ with 7 wt% and AMP with 23 wt%), an amine flow rate range of 2.89–3.97 m3 m−2 h−1, a gas flow rate range of 33–51 kmol m−2 h−1, and a feed temperature range of 30 °C to 35 °C. Their results indicated that high pressure, amine flow rate, and amine concentration had a large effect on KGCO2aV, and; the KGCO2aV values were unaffected by the gas flow rate. Following the work of Halim, et al.,80 Hairul, et al.81 performed experiments under different conditions of operating parameters. Their setup for an absorber column was similar the one in the work of Halim, et al.80 They determined KGCO2aV under different operating conditions over a pressure range of 10–50 bar, a CO2 concentration range of 30% to 50% mol, an amine concentration range of 3–9 wt% for PZ and 23–30 wt% for AMP, an amine flow rate range of 2.89–4.33 m3 m−2 h−1, a gas flow rate range of 33–40 kmol m−2 h−1, and feed temperature range of 30 °C to 35 °C. Their results showed that by increasing pressure above 20 bar, KGCO2aV increased, and by increasing the CO2 concentration in the feed gas, KGCO2aV decreased. In addition, the performance of AMP in removing CO2 from natural gas was compared with the AMP–PZ solution, and results showed the AMP–PZ system to be superior in terms of CO2 removal efficiency.”

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