A new method to regenerate high pressure CO₂ absorbent is presented in this paper, where PTFE hollow fiber membrane contactor was used as a gas–liquid separator in pressure swing process. CO₂ desorption happened in the membrane contactor at the same time. The two mass transfer mechanisms were analysed through calculation of viscous flux and mass transfer coefficients. Experimental results showed that CO₂ loading in regenerated absorbent increased with absorbent flow rate. This was due to decrease in membrane area available for CO₂ desorption, as most of the membrane area was utilized for gas-liquid separation. Co-current configuration exhibited higher CO₂ desorption driving force compared to counter-current configuration, hence its CO₂ loading in regenerated absorbent was lower. When integrated with membrane contactor for CO₂ absorption, stable and consistent performance was observed. Unlike conventional flash drum, membrane contactor did not have requirement on flashed gas velocity, because the membrane itself functioned as a screen to prevent fine liquid droplets from escaping the system along with flashed gas. Results from this study show that vessel size reduction up to 2.5 times could be achieved when PTFE membrane contactor was used, with absorbent regeneration energy as low as 0.94 GJ/ton CO₂.

本文提出了一种新的再生高压CO ₂吸收剂的方法，其中PTFE中空纤维膜接触器在变压过程中用作气液分离器。同时在膜接触器中发生了CO ₂解吸。通过计算粘性通量和传质系数来分析两种传质机理。实验结果表明，随着吸收剂流速的增加，再生吸收剂中的CO ₂含量增加。这是由于可用于CO ₂解吸的膜面积减少，因为大部分膜面积都用于气液分离。并流配置表现出更高的CO ₂与逆流配置相比，其解吸驱动力更高，因此再生吸收剂中的CO ₂负载量更低。当与膜接触器集成以吸收CO _2时，观察到稳定且一致的性能。与传统的闪蒸鼓不同，膜接触器对闪蒸气体的速度没有要求，因为膜本身起着筛网的作用，可防止细小液滴与闪蒸气体一起逸出系统。这项研究的结果表明，使用PTFE膜接触器可将容器尺寸减小多达2.5倍，吸收剂的再生能量低至0.94 GJ /吨CO ₂。