Joint International Center for CO2 Capture and Storage (iCCS), Provincial Hunan Key Laboratory forCost-effective Utilization of Fossil Fuel Aimed at Reducing CO2 Emissions, College of Chemistry and ChemicalEngineering, Hunan University

燃煤电厂、钢铁企业等尾气中低浓度CO2的排放控制是实现“碳中和”目标的关键。目前胺法捕获CO2技术被认为是最有产业化应用前景的技术。为突破现有胺法在降能耗方面的技术瓶颈,旨在开发高效的相分离CO2吸收剂。探究了伯/仲胺结构对与胺-正丁醇-水吸收剂吸收CO2后分相特性的构效关系,研究了叔胺结构对3-氨基丙醇(3AP)-正丁醇(NBA)-水吸收-解吸和分相性能的作用规律。实验结果显示,3AP-NBA-H2O吸收剂在富CO2相黏度、胺分布、体积和相变临界点等方面均具有一定的优势,表明其具有良好的分相特性。添加叔胺可以明显降低富CO2相黏度,同时提高单位体积溶液的CO2循环容量和解吸率。新型20%3AP-10%N,N-二甲基乙醇胺(DMEA)-40%NBA-30%H2O相分离吸收剂的富相体积为61.2%,黏度仅为6.73mPa·s,富相中胺的占比为91.2%,其解吸率和CO2循环容量分别达72.00%和1.42mol·L-1,分别比30%3AP-40%NBA-30%H2O吸收剂提高了88.6%和86.8%,比30%单乙醇胺(MEA)溶液提高了46.8%和13.6%。

Controlling CO2 emissions from low-concentration sources like coal-fired power plants andsteel mills is crucial for achieving " carbon neutrality" . Amine-based CO2 capture technology is a lead-ing contender for industrial application. This study aims to overcome limitations in energy consumptionassociated with amine-based processes by developing an efficient phase-separating CO2 absorbent. Thestructural effects of primary and secondary amines on the phase separation characteristics of amine-n-butanol-water absorbents after CO2 absorption were investigated. The role of tertiary amines in the ab-sorption-desorption and phase separation performance of 3AP-NBA-H2O was also studied. Experimen-tal results showed that the 3-aminopropanol (3AP) -n-butanol (NBA) -water absorbent had certainadvantages in terms of rich CO2 phase viscosity, amine distribution, volume, and phase transition criti-cal point, indicating good phase separation characteristics. The addition of tertiary amines significantlyreduced the viscosity of the rich CO2 phase while increasing the CO2 cycling capacity and desorptionrate per unit volume of the solution. The novel 20%3AP -10%N,N-dimethylethanolamine(DMEA) -40%NBA-30%H2O phase-separating absorbent had a rich phase volume of 61.2% and a viscosity ofonly 6.73 mPa·s. The proportion of amine in the rich phase was 91.2%, with desorption rate and CO2cycling capacity reaching 72.00% and 1.42 mol·L-1, respectively. Compared to the absorbent with30%3AP-40%NBA-30%H2O, the desorption rate and CO2 cycling capacity were improved by 88.6%and 86.8%, respectively, while showing an improvement of 46.8% and 13.6% compared to a 30% mo-noethanolamine (MEA) solution.

国家重点研发计划“政府间国际科技创新合作”重点专项资助项目(2021YFE0112800)

洪淑敏,胡兴,郑壮壮,等.高效3AP-DMEA-正丁醇-水相分离CO2吸收剂的开发[J].能源环境保护,2024,38(3):100-108.

HONG Shumin, HU Xing, ZHENG Zhuangzhuang, et al. Development of an efficient 3AP-DMEA-butanol-waterphase change absorbent for CO2 capture[J]. Energy Environmental Protection, 2024, 38(3): 100-108.