In this work, the CO₂ absorption by potassium hydroxide aqueous solution was studied. The response surface methodology (RSM) based on central composite design (CCD) was used to design experiments, make models, and find the optimum operating conditions for attaining desirable responses in the range of temperature, pressure and absorbent concentration of 25–65 °C, 2–10 bar and 0.01–1.21 mol/lit, respectively. The effects of process variables and their interactions on the responses were investigated with the numerical model, obtained from experimental data fitting to a second-order polynomial model, to achieve the optimal conditions. The experiments and numerical model indicated that the increase in temperature and absorbent concentration decrease CO₂ loading, and an increase in pressure increase CO₂ loading. Optimum conditions were found to be the temperature of 35 °C, pressures of 4 bar and, KOH concentration of 0.412 mol/lit. The CO₂ loading of 0.745 and CO₂ removal efficiency of 32.221% were achieved in the optimal conditions. The modified Pitzer’s G^E model was used for CO₂ + KOH + H₂O system, in order to investigate the species concentration in the liquid phase. The average relative error between predicted CO₂ loading and experimental CO₂ loading was 7.4%.

在这项工作中，研究了氢氧化钾水溶液对CO _{2 的}吸收。基于中心复合设计 (CCD) 的响应面方法 (RSM) 用于设计实验、制作模型并找到最佳操作条件，以在 25–65 °C 的温度、压力和吸收剂浓度范围内获得理想的响应, 2–10 bar 和 0.01–1.21 mol/lit。使用数值模型研究过程变量及其相互作用对响应的影响，该数值模型是通过拟合二阶多项式模型的实验数据获得的，以获得最佳条件。实验和数值模型表明，温度和吸收剂浓度的增加降低了 CO ₂负载，压力增加会增加 CO ₂负载。发现最佳条件是 35 °C 的温度、4 bar 的压力和 0.412 mol/L 的 KOH 浓度。在最佳条件下，CO ₂负载量为0.745，CO ₂去除效率为32.221%。修改后的匹兹的ģ ^Ë使用型号为CO ₂  + KOH + H ₂ O系统中，为了调查在液相中的组分浓度。预测的CO ₂负载和实验的CO ₂负载之间的平均相对误差为7.4%。