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Carbon capture, utilization and storage technology is an important way to realize the carbon peaking and carbon neutrality goals in China. Among them, the non-aqueous phase absorbents have great energy-saving potential, and it is suitable for the existing mixed amine reactor, which has a large development potential. However, there are still problems such as high viscosity of CO2 saturated solution and low circulating load. In this regard, a non-aqueous absorption system with low viscosity and regeneration temperature was constructed using secondary amine MCA as the absorbing component and EG as the organic solvent. The absorption and regeneration performance of MCA/EG was investigated. The results showed that, the absorption load of 3 mol/L MCA/EG solvent was up to 2.14 mol/L, and the viscosity was only 44.19 mPa∙s. Under the condition of absorption at 40 ℃ for 30 min and regeneration at 80 ℃ for 25 min, the cyclic load was as high as 0.98 mol/L, which is 1.46 times of the cyclic load of 30% MEA/H2O solution at 105.5 ℃. The reaction heat of the absorbent was measured to be -82.85 kJ/mol by C80 microcalorimeter, which was lower than that of the MEA/H2O solution. The reaction mechanism of CO2 capture by MCA/EG was explored by 13C NMR and quantum chemical calculations. It was found that the stability of the reaction products was reduced for the steric hindrance effect of MCA. The carbamates transform into alkyl carbonate by reacting with EG to realize the regeneration at low temperatures. MCA/EG can realize the stable operation of non-aqueous phase absorbent and expand the scope of waste heat utilization in absorbent regeneration, which has a great advantage of energy reduction.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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