期刊
SEPARATION AND PURIFICATION TECHNOLOGY
卷 288, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.seppur.2022.120634
关键词
Amine alkyl organosilicon; Optimal absorption and desorption; temperature; capture of SO2; Objective function; Enthalpy and entropy change
资金
- National Natural Science Foundation of China [22068016, 21666011]
- Yunnan prov-ince high level talents special support plan [YNWR-QNBJ-2018-369]
- Analysis and Measure Foundation of Kunming University of Science and Technology [2020 M20192208031, 2018 T20090102]
A low viscous and high thermal stable compound was synthesized by two steps reaction, showing high reaction enthalpy and entropy change. Its regeneration sensible heat consumption is the lowest, with optimal absorption and desorption temperature. Considering the optimal temperature range of adsorbents is crucial for evaluating their performance.
A low viscous and high thermal stable dibutyl-(1,1-dimethyl-3,3,3-triphenyl-disiloxanylmethyl)-amine (DDTDA) was synthesized by two steps reaction. Its reaction enthalpy and entropy change with SO2 were found to be-85.39 kJ/mol and-244 J mol(-1) K-1, whose absolute value are much higher than those of ionic liquids (ILs) and deep eutectic solvents (DESs). An objective function was proposed to balance reversible capacity and regeneration sensible heat consumption per unit absorption capacity. Based on it, the optimal absorption and desorption temperature of DDTDA were calculated and the temperature difference was found to be much lower than those of ILs and DESs, which implied its regeneration sensible heat is the lowest. According to the function, the traditional method to evaluate two absorbents by simply comparing their capacities at a certain temperature is unscientific. Different absorbents have different optimal absorption and desorption temperature range.
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