Sol–gel synthesis, characterization and water vapor adsorption properties of 1,1′-(1,6-hexanediyl)-bis(imidazolium)dichloride-silica hybrid material

Amarasekara, Ananda S.; Razzaq, Ashfaqur; Caballero, R Manuel; Wiredu, Bernard

doi:10.1007/s10971-013-3223-2

Cited by 5 publications

(3 citation statements)

References 26 publications

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“…On the other hand, from the standpoint of the dehumidification property of the neat ILs, except for the case of [Ch][DMPO 4 ], [HMEDA][DMPO 4 ] showed the highest dehumidification capability. It was reported that the 1,1’ -(1,6-hexanediyl)-bis(imidazolium)dichloride-silica hybrid material showed a significant water vapor absorption [ 50 ]. These results seem to suggest that the polycationic quaternary ammonium salts could become good desiccant materials, though such a compound may not suitable as a desiccant source for an air-conditioner system.…”

Section: Resultsmentioning

confidence: 99%

Design of quaternary ammonium type-ionic liquids as desiccants for an air-conditioning system

Maekawa¹,

Matsumoto²,

Ito³

et al. 2020

Green Chemical Engineering

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The liquid desiccant air-conditioning system allows reducing energy consumption compared to the conventional compressor-type air conditioners. In order to develop desiccant materials for air conditioners, we have investigated the dehumidification capability of quaternary ammonium Ionic Liquids (ILs) and the equilibrium water vapor pressure of aqueous solutions of these ammonium salts. Among the seven tested types of ILs, 2-hydroxy- N , N , N -trimethylethan-1-aminium dimethylphosphate ([Ch][DMPO 4 ]) displayed the best dehumidification capability and the lowest equilibrium water vapor pressure. Furthermore, the 80% aqueous solution of [Ch][DMPO 4 ] exhibited a less corrosive effect on four types of metals, i.e., steel (hot dip zinc-aluminum alloy plated steel), copper (C1100P), aluminum (A5052), and stainless steel (SUS: SUS304). It should be noted that this [Ch][DMPO 4 ] is not only non-toxic but also exhibits a stable nature; the aqueous solution produced no odor after storing for over 1 year under ambient conditions.

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Section: Resultsmentioning

confidence: 99%

Design of quaternary ammonium type-ionic liquids as desiccants for an air-conditioning system

Maekawa¹,

Matsumoto²,

Ito³

et al. 2020

Green Chemical Engineering

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“…We also found that dicationic quaternary ammonium bis(dimethylphosphate), N 1 , N 1 , N 1 , N 2 , N 2 , N 2 -hexamethylethane-1,2-diaminium bis(dimethylphosphate) ([HMC2][DMPO 4 ] 2 ) shows a high dehumidification capability though its overall performance was slightly inferior to that of [Ch][DMPO 4 ] . Not surprisingly, a related but different dicationic salt, 1,1′-(1,6-hexanediyl)-bis(imidazolium)dichloride-silica, was previously found to exhibit a good dehumidification capability . As for the corrosive effect, we observed that aqueous solutions of [Ch][DMPO 4 ] and [HMC2][DMPO 4 ] 2 are less caustic to metals than imidazolium salts …”

Section: Introductionmentioning

confidence: 87%

“…49 Not surprisingly, a related but different dicationic salt, 1,1′-(1,6-hexanediyl)-bis(imidazolium)dichloride-silica, was previously found to exhibit a good dehumidification capability. 50 As for the corrosive effect, we observed that aqueous solutions of [Ch][DMPO 4 ] and [HMC2][DMPO 4 ] 2 are less caustic to metals than imidazolium salts. 49 Encouraged by the prior findings about dicationic ILs and the corrosive effect of quaternary ammonium salts on metals, we have conducted a systematic evaluation of the dicationic ILs consisting of dicationic quaternary ammonium cations paired with dimethylphosphate (DMPO 4 ) or diethylphosphate (DEPO 4 ) anions as a source for desiccant materials for use in the liquid desiccant air-conditioning system.…”

Section: ■ Introductionmentioning

confidence: 99%

Dicationic-Type Quaternary Ammonium Salts as Candidates of Desiccants for an Air-Conditioning System

Itoh

Hiramatsu

Kamada

et al. 2021

ACS Sustainable Chem. Eng.

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Liquid desiccant air conditioners contribute to sustainable living by reducing the electricity consumption. They can be driven with continuous ventilation and thus can prevent airborne transmission of infectious diseases like COVID-19. In order to develop efficient desiccant materials for liquid desiccant air conditioners, we have investigated the dehumidification capability of 21 types of ammonium salts, many of them being ionic liquids. The hygroscopicity of dicationic quaternary ammonium bis(dimethyl or diethylphosphate) is found to increase with the carbon chain length of the spacer group −(CH2) n – that bridges the two terminal cationic moieties of the dication, that is, (CH2)2 < (CH2)3 < (CH2)6. This trend remains unchanged when methyl substituents on the cation and the phosphate anion are replaced by ethyl groups. A high dehumidification capability is obtained for N 1,N 1,N 1,N 6,N 6,N 6-hexamethylhexane-1,6-diaminium bis(dimethylphosphate) ([HMC6][DMPO4]2) and 1,6-diethyl-1,1,6,6-tetramethylhexane-1,6-diaminium bis(diethylphosphate) ([DETMC6][DEPO4]2); their capability per gram reaches almost twice that of CaCl2, and their dehumidification rate is superior to popular solid desiccants. A favorable equilibrium water vapor pressure for the liquid desiccant air-conditioning system is attained for an 80% (w/w) aqueous solution of [HMC6][DMPO4]2. In addition, the 80% aqueous solution of [HMC6][DMPO4]2 affords no corrosive effect on steel, aluminum, and stainless steel and a very weak effect on copper. Dicationic quaternary ammonium bis(dimethyl or diethylphosphate)s are stable compounds; their aqueous solutions produce no odor after storing for over 1 year under ambient conditions. Molecular dynamics simulations are performed to gain insights into the solvation structure, energetics, and transport behavior of water in aqueous solutions of [HMC6][DMPO4]2 and related salts.

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Acidic ionic liquid polymers: poly(bis-imidazolium-p-phenylenesulfonic acid) and applications as catalysts in the preparation of 1-amidoalkyl-2-naphthols

2017

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Sol–gel synthesis, characterization and water vapor adsorption properties of 1,1′-(1,6-hexanediyl)-bis(imidazolium)dichloride-silica hybrid material

Cited by 5 publications

References 26 publications

Design of quaternary ammonium type-ionic liquids as desiccants for an air-conditioning system

Design of quaternary ammonium type-ionic liquids as desiccants for an air-conditioning system

Dicationic-Type Quaternary Ammonium Salts as Candidates of Desiccants for an Air-Conditioning System

Acidic ionic liquid polymers: poly(bis-imidazolium-p-phenylenesulfonic acid) and applications as catalysts in the preparation of 1-amidoalkyl-2-naphthols

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