N-Methyl-diethanolamine (MDEA) is a potential solvent to capture CO₂ at high-pressure and high CO₂ concentration conditions due to its high CO₂-loading capacity and the pressure-driven nature of CO₂-MDEA reaction equilibrium. However, no studies have been reported on packed column modelling and experimental evaluation of CO₂ absorption process using MDEA solvent for high pressure and high CO₂ concentration conditions. Therefore, this study presents the experimental evaluation and modelling of CO₂ absorption in the packed column using the MDEA solution at these extreme conditions. The effects of amine concentrations (0.83–3 M), liquid flowrates (3.61–5.42 m³/m²h) and feed CO₂ concentrations (35–45%) have been studied on the CO₂ removal efficiency at 40 bar total pressure and 1.8 kg/h gas flowrate. Highest CO₂ removal efficiency is found to be 61.7% for 35% CO₂ at 5.42 m³/m²h and 2 M MDEA solution. Further, a rate-based model is developed by accounting for sequential chemical reactions and associated mass transfer resistances occurring at low (<1 mol_CO2/mol_MDEA) and high CO₂ (>1 mol_CO2/mol_MDEA) loadings. The developed model has been successfully validated with the experimental data. In a parity plot of CO₂ concentration profiles along the column height, R² is found to be 0.97. Further the model is applied to forecast CO₂ absorption performance over the extended process conditions. It is found that 98.2% CO₂ removal efficiency can be achieved for 40% CO₂ at the conditions of 333.15 K temperature, 4 M MDEA concentration, and 5.42 m³/m²h liquid flowrates.

N-甲基二乙醇胺（MDEA）由于其高的CO ₂负载能力和CO ₂ -MDEA反应平衡的压力驱动性质，因此是在高压和高CO ₂浓度条件下捕获CO ₂的潜在溶剂。然而，关于在高压和高CO ₂浓度条件下使用MDEA溶剂进行填充柱建模和CO ₂吸收过程的实验评估的研究尚未见报道。因此，本研究介绍了在这些极端条件下使用MDEA溶液对填充柱中CO ₂吸收进行的实验评估和建模。胺浓度（0.83–3 M），液体流量（3.61–5.42 m）的影响³ / m ² h）和进料CO ₂浓度（35％-45％）已研究了在40 bar总压力和1.8 kg / h气体流量下的CO ₂去除效率。发现在5.42 m ³ / m ² h和2 M MDEA溶液中，对于35％的CO ₂，最高的CO ₂去除效率为61.7％。此外，通过考虑在低（<1 mol _CO2 / mol _MDEA）和高CO ₂（> 1 mol _CO2 / mol _MDEA）下发生的顺序化学反应和相关的传质阻力，建立了基于速率的模型）加载。实验数据已成功验证了开发的模型。在沿色谱柱高度的CO ₂浓度分布的奇偶图中，R ²为0.97。此外，该模型可用于预测扩展过程条件下的CO ₂吸收性能。发现在333.15K的温度，4M的MDEA浓度和5.42m ³ / m ² h的液体流量的条件下，对于40％的CO ₂可以实现98.2％的CO ₂去除效率。