5161-60-4Relevant academic research and scientific papers
Concentrated aqueous solutions of protic ionic liquids as effective CO2 absorbents with high absorption capacities
Zheng, Wen-Tao,Zhang, Feng,Wu, You-Ting,Hu, Xing-Bang
, p. 169 - 177 (2017)
Solubilities of CO2 in a series of aqueous 3-(dimethylamino)-1-propylamine (DMAPA) cation-based protic ionic liquids (PILs) with different anions were determined at 308.2 K and pressure up to 3.5 bar. Impressively, the solubility of CO2 in the [DMAPAH][F] aqueous solution reached up to 3.62 mol/kg at 1 bar and 308.2 K, which was much superior to the traditional amine solutions and other ILs reported in the literature. A novel absorption mechanism is proposed and verified by 13C NMR and 19F NMR spectra. Based on this, CO2 absorption behaviors on pressure, temperature and concentrations of [DMAPAH][F] in aqueous solutions were studied. Meanwhile, the relevant parameters, such as the apparent absorption rate constant k, the absorption activation energy Ea, the dissolution enthalpy change ΔHSOL and the entropy change ΔSSOL were also calculated from the dynamic and thermodynamic data. Regeneration under the condition of 353.2 K and 15 kPa for 1 h showed that aqueous [DMAPAH][F] solution had good regeneration efficiency (over 94%). The absorption capacity (3.62 mol/kg), the ΔHSOL (? 35 to ? 43 kJ·mol? 1), as well as the good recyclability indicate that the aqueous [DMAPAH][F] is a kind of promising absorbent for the separation of CO2 and believed to have potential use in gas decarburization.
Ionothermal synthesis and crystal structures of novel aluminum phosphates with in situ generated templates
Man, Shanshan,Wang, Zenglong,Zhao, Boya,Liu, Lei,Dong, Jinxiang
, p. 2294 - 2298 (2015)
Protic ionic liquids (PILs) are a subgroup of ionic liquids and easily formed by proton transfer from a Bronsted acid to a Bronsted base. Two new crystalline aluminophosphates, [C5H16N2][Al(PO4)(HPO4)] (AlPO-PIL1) and [C5H16N2][Al2(OH)2 (PO4)2] (AlPO-PIL2), are successfully prepared for the first time from a protic ionic liquid, 3-dimethylaminopropylamine acetate. Their structures were determined from single-crystal X-ray diffraction data. It was found that HF in the reaction mixture is crucial in determining the selectivity of the phase. In the absence of HF, AlPO-PIL1 with a one-dimensional chain structure was synthesized by templating the protonated 3-dimethylaminopropylamine cation of the PIL. Upon addition of HF to the initial reaction mixture, AlPO-PIL2 was obtained by templating the protonated N,N′-dimethyl-1,3-propanediamine, which was in situ generated from the protonated 3-dimethylaminopropylamine through migration of methyl groups during the crystallization. AlPO-PIL2 has a novel layered structure with a 3-connected 4·8·8 two-dimensional network which has never been found in the previously reported layered aluminophosphates.
