This study investigated the chemical absorption of carbon dioxide gas from a carbon dioxide–nitrogen gas mixture at a low partial pressure of carbon dioxide (0.1–1.0 bar) using a water-in-oil microemulsion system. Gas chemisorption in the aqueous phase was examined using N-methyldiethanolamine (MDEA) at 3 mol kg^–1 concentration and piperazine (PZ) at concentrations ranging from 0.3 to 0.9 mol kg^–1. The first stage was to assess the effectiveness of the microemulsion system in comparison to that of the nonemulsion system for gas absorption. Then, the aim was to evaluate the effectiveness of PZ in combination with an amine. The results clearly validate the superior gas absorption performance of the microemulsion system compared to that of the nonemulsion system. Furthermore, concerning the effectiveness of PZ, the results indicate that PZ is more efficient at low partial pressures of carbon dioxide than at high pressures. An interesting observation is that in a solution with a constant concentration of MDEA and PZ, as the partial pressure of carbon dioxide gas changes, PZ performs optimally at a partial pressure of 0.3 bar. Additionally, the results obtained confirm the linearity of the relationship between the mole fraction of PZ in the MDEA/PZ solution and the carbon dioxide loading of the MDEA/PZ solution within this pressure range.

中文翻译：

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评估哌嗪对 N-甲基二乙醇胺水溶液和水/油微乳液中二氧化碳负载的有效性

本研究使用油包水微乳液系统研究了在低二氧化碳分压（0.1-1.0 bar）下从二氧化碳-氮气混合物中化学吸收二氧化碳气体的情况。使用浓度为 3 mol kg ^{–1 的}N-甲基二乙醇胺 (MDEA)和浓度范围为 0.3 至 0.9 mol kg ^–1的哌嗪 (PZ)检查水相中的气体化学吸附。第一阶段是评估微乳液系统与非乳液系统相比的气体吸收效果。然后，目的是评估 PZ 与胺组合的有效性。结果清楚地验证了微乳液系统与非乳液系统相比具有优越的气体吸收性能。此外，关于 PZ 的有效性，结果表明 PZ 在低二氧化碳分压下比在高压下更有效。一个有趣的观察结果是，在 MDEA 和 PZ 浓度恒定的溶液中，随着二氧化碳气体分压的变化，PZ 在 0.3 bar 的分压下表现最佳。此外，获得的结果证实了在此压力范围内MDEA/PZ溶液中PZ的摩尔分数与MDEA/PZ溶液的二氧化碳负载量之间的关系的线性。