Physical data for a process to separate krypton from air by selective absorption in an ionic liquid

Waheed Afzal; Xiangyang Liu; John M Prausnitz

doi:10.1016/j.fluid.2015.06.037

Physical data for a process to separate krypton from air by selective absorption in an ionic liquid

Waheed Afzal, Xiangyang Liu, John M Prausnitz^* (Corresponding Author)

^*Corresponding author for this work

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Abstract

Ionic liquids provide a possible absorption process to extract krypton from air. The feed for such a process is an oxygen stream from a liquid-air plant. An effective ionic liquid is [P(14)666][TMPP]; in that solvent, the solubilities of some pertinent common gases are appreciably larger than those in conventional ionic liquids, and the selectivity Kr/O2 is close to 3. A nonvolatile ionic liquid is preferred over a hydrocarbon solvent because of safety and simpler solvent recovery. Because, the viscosity of [P(14)666][TMPP] is very high, 20 wt.% [BHMIM][AC] is added to reduce the viscosity by one order of magnitude without significantly reducing solvent capacity and selectivity. This work provides extensive fundamental data (solubility, density and viscosity) required for process design.

Original language	English
Pages (from-to)	124-130
Number of pages	7
Journal	Fluid Phase Equilibria
Volume	404
Early online date	2 Jul 2015
DOIs	https://doi.org/10.1016/j.fluid.2015.06.037
Publication status	Published - 25 Oct 2015

Keywords

Selectivity Kr/O2
mixture of ionic liquids
separation
absorption
diluent

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Waheed Afzal
- Engineering,
- Centre for Energy Transition
Person: Academic

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@article{8e10d6d2b27b415b8f253ae2d8969e10,

title = "Physical data for a process to separate krypton from air by selective absorption in an ionic liquid",

abstract = "Ionic liquids provide a possible absorption process to extract krypton from air. The feed for such a process is an oxygen stream from a liquid-air plant. An effective ionic liquid is [P(14)666][TMPP]; in that solvent, the solubilities of some pertinent common gases are appreciably larger than those in conventional ionic liquids, and the selectivity Kr/O2 is close to 3. A nonvolatile ionic liquid is preferred over a hydrocarbon solvent because of safety and simpler solvent recovery. Because, the viscosity of [P(14)666][TMPP] is very high, 20 wt.% [BHMIM][AC] is added to reduce the viscosity by one order of magnitude without significantly reducing solvent capacity and selectivity. This work provides extensive fundamental data (solubility, density and viscosity) required for process design.",

keywords = "Selectivity Kr/O2, mixture of ionic liquids, separation, absorption, diluent",

author = "Waheed Afzal and Xiangyang Liu and Prausnitz, {John M}",

note = "This work was supported by the Assistant Secretary for Energy Efficiency and Renewable Energy, Office of Building Technology, Building Technologies Program of the U.S. Department of Energy under Contract No. DE-AC02-05CH11231. The authors are grateful to Robert Hart, Dragan Curcija, Alexis Bell, Scott Lynn and co-workers for valuable advice, and to Maogang He for assistance in preparing the manuscript.",

year = "2015",

month = oct,

day = "25",

doi = "10.1016/j.fluid.2015.06.037",

language = "English",

volume = "404",

pages = "124--130",

journal = "Fluid Phase Equilibria",

issn = "0378-3812",

publisher = "Elsevier",

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TY - JOUR

T1 - Physical data for a process to separate krypton from air by selective absorption in an ionic liquid

AU - Afzal, Waheed

AU - Liu, Xiangyang

AU - Prausnitz, John M

N1 - This work was supported by the Assistant Secretary for Energy Efficiency and Renewable Energy, Office of Building Technology, Building Technologies Program of the U.S. Department of Energy under Contract No. DE-AC02-05CH11231. The authors are grateful to Robert Hart, Dragan Curcija, Alexis Bell, Scott Lynn and co-workers for valuable advice, and to Maogang He for assistance in preparing the manuscript.

PY - 2015/10/25

Y1 - 2015/10/25

N2 - Ionic liquids provide a possible absorption process to extract krypton from air. The feed for such a process is an oxygen stream from a liquid-air plant. An effective ionic liquid is [P(14)666][TMPP]; in that solvent, the solubilities of some pertinent common gases are appreciably larger than those in conventional ionic liquids, and the selectivity Kr/O2 is close to 3. A nonvolatile ionic liquid is preferred over a hydrocarbon solvent because of safety and simpler solvent recovery. Because, the viscosity of [P(14)666][TMPP] is very high, 20 wt.% [BHMIM][AC] is added to reduce the viscosity by one order of magnitude without significantly reducing solvent capacity and selectivity. This work provides extensive fundamental data (solubility, density and viscosity) required for process design.

AB - Ionic liquids provide a possible absorption process to extract krypton from air. The feed for such a process is an oxygen stream from a liquid-air plant. An effective ionic liquid is [P(14)666][TMPP]; in that solvent, the solubilities of some pertinent common gases are appreciably larger than those in conventional ionic liquids, and the selectivity Kr/O2 is close to 3. A nonvolatile ionic liquid is preferred over a hydrocarbon solvent because of safety and simpler solvent recovery. Because, the viscosity of [P(14)666][TMPP] is very high, 20 wt.% [BHMIM][AC] is added to reduce the viscosity by one order of magnitude without significantly reducing solvent capacity and selectivity. This work provides extensive fundamental data (solubility, density and viscosity) required for process design.

KW - Selectivity Kr/O2

KW - mixture of ionic liquids

KW - separation

KW - absorption

KW - diluent

U2 - 10.1016/j.fluid.2015.06.037

DO - 10.1016/j.fluid.2015.06.037

M3 - Article

VL - 404

SP - 124

EP - 130

JO - Fluid Phase Equilibria

JF - Fluid Phase Equilibria

SN - 0378-3812

ER -

Physical data for a process to separate krypton from air by selective absorption in an ionic liquid

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