A phase-change solvent for CO₂ absorption was prepared by mixing N-methyl-1,3-diaminopropane (MAPA) and N,N-dimethylformamide (DMF). In this MAPA/DMF solvent, MAPA-carbamate precipitate was formed after CO₂ absorption to facilitate reducing energy consumption of amine regeneration. The CO₂ uptake of MAPA/DMF solvent (14.8 mg/g solvent) was increased by 22% compared with that of MAPA/water solvent (12.1 mg/g solvent). For MAPA/DMF solvent, time was reduced by 22% to reach the CO₂ absorption equilibrium. The maximum CO₂ uptake rate of MAPA/DMF solvent was 30% higher than that of MAPA/water solvent because DMF displayed higher CO₂ solubility and lower MAPA-carbamate solubility than water. Differential scanning calorimetry and thermogravimetry experiments revealed that MAPA(H⁺)₂ and MAPA(CO₂^–)₂ compositions in MAPA-carbamate precipitate first decomposed (peak temperature = 59.9 °C). Subsequently, the MAPACO₂ compositions in precipitate also decomposed (peak temperature = 124.2 °C).

中文翻译：

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N-甲基-1,3-二氨基丙烷/ N，N-二甲基甲酰胺溶剂相变中CO ₂吸收和氨基甲酸酯沉淀的表征

通过混合N-甲基-1，3-二氨基丙烷（MAPA）和N，N-二甲基甲酰胺（DMF）来制备用于CO ₂吸收的相变溶剂。在该MAPA / DMF溶剂中，吸收CO ₂后会形成MAPA-氨基甲酸酯沉淀，从而有助于减少胺再生的能耗。与MAPA /水溶剂（12.1 mg / g溶剂）相比，MAPA / DMF溶剂（14.8 mg / g溶剂）的CO ₂吸收增加了22％。对于MAPA / DMF溶剂，时间减少了22％，达到了CO ₂吸收平衡。MAPA / DMF溶剂的最大CO ₂吸收率比MAPA /水溶剂的最大CO ₂吸收率高30％，因为DMF显示出更高的CO₂溶解度，比水更低的MAPA-氨基甲酸酯溶解度。差示扫描量热和热实验表明MAPA（H ⁺）₂和MAPA（CO ₂ ^- ）_2个组合物在MAPA氨基甲酸酯沉淀首先被分解（峰温度= 59.9℃）。随后，沉淀物中的MAPACO ₂组合物也分解（峰值温度＝ 124.2℃）。