Behavior of LiOH·H2O crystals obtained by evaporation and by drowning out

T. A. Graber; J. W. Morales; P. A. Robles; H. R. Galleguillos; M. E. Taboada

doi:10.1002/crat.200711110

Behavior of LiOH·H₂O crystals obtained by evaporation and by drowning out

T. A. Graber, J. W. Morales, P. A. Robles, H. R. Galleguillos, M. E. Taboada

Research output: Contribution to journal › Article › peer-review

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Abstract

In the present work, the behavior of crystals derived from two different crystallization methods applied in a concentrated aqueous lithium salt solution was studied. The LiOH·H₂O crystals obtained by a simple evaporation (Crystal I) differed in terms of morphology and solubility from those precipitated from lithium hydroxide solutions by addition of ethanol as a co-solvent (Crystal II). Solubility of Crystal II at different temperatures (15 to 35°C) and mass ratios of ethanol to water (0 to 0.1) was determined. Polymorphic like behavior of these crystals was evidenced from X-ray diffraction patterns. Measurement of density, refractive index, absolute viscosity and electrical conductivity of saturated solutions are reported. A thermodynamic analysis in terms of the Chen model for the calculation of activity coefficients, indicate that the polymorphic system in water and in water + ethanol (ethanol/water ratio 0.1 ) is enantiotropic.

Original language	English
Pages (from-to)	616-625
Number of pages	10
Journal	Crystal Research and Technology
Volume	43
Issue number	6
DOIs	https://doi.org/10.1002/crat.200711110
State	Published - Jun 2008
Externally published	Yes

Keywords

Crystal polymorphism
Crystallization
Lithium hydroxide

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10.1002/crat.200711110

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title = "Behavior of LiOH·H2O crystals obtained by evaporation and by drowning out",

abstract = "In the present work, the behavior of crystals derived from two different crystallization methods applied in a concentrated aqueous lithium salt solution was studied. The LiOH·H2O crystals obtained by a simple evaporation (Crystal I) differed in terms of morphology and solubility from those precipitated from lithium hydroxide solutions by addition of ethanol as a co-solvent (Crystal II). Solubility of Crystal II at different temperatures (15 to 35°C) and mass ratios of ethanol to water (0 to 0.1) was determined. Polymorphic like behavior of these crystals was evidenced from X-ray diffraction patterns. Measurement of density, refractive index, absolute viscosity and electrical conductivity of saturated solutions are reported. A thermodynamic analysis in terms of the Chen model for the calculation of activity coefficients, indicate that the polymorphic system in water and in water + ethanol (ethanol/water ratio 0.1 ) is enantiotropic.",

keywords = "Crystal polymorphism, Crystallization, Lithium hydroxide",

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AU - Graber, T. A.

AU - Morales, J. W.

AU - Robles, P. A.

AU - Galleguillos, H. R.

AU - Taboada, M. E.

PY - 2008/6

Y1 - 2008/6

N2 - In the present work, the behavior of crystals derived from two different crystallization methods applied in a concentrated aqueous lithium salt solution was studied. The LiOH·H2O crystals obtained by a simple evaporation (Crystal I) differed in terms of morphology and solubility from those precipitated from lithium hydroxide solutions by addition of ethanol as a co-solvent (Crystal II). Solubility of Crystal II at different temperatures (15 to 35°C) and mass ratios of ethanol to water (0 to 0.1) was determined. Polymorphic like behavior of these crystals was evidenced from X-ray diffraction patterns. Measurement of density, refractive index, absolute viscosity and electrical conductivity of saturated solutions are reported. A thermodynamic analysis in terms of the Chen model for the calculation of activity coefficients, indicate that the polymorphic system in water and in water + ethanol (ethanol/water ratio 0.1 ) is enantiotropic.

AB - In the present work, the behavior of crystals derived from two different crystallization methods applied in a concentrated aqueous lithium salt solution was studied. The LiOH·H2O crystals obtained by a simple evaporation (Crystal I) differed in terms of morphology and solubility from those precipitated from lithium hydroxide solutions by addition of ethanol as a co-solvent (Crystal II). Solubility of Crystal II at different temperatures (15 to 35°C) and mass ratios of ethanol to water (0 to 0.1) was determined. Polymorphic like behavior of these crystals was evidenced from X-ray diffraction patterns. Measurement of density, refractive index, absolute viscosity and electrical conductivity of saturated solutions are reported. A thermodynamic analysis in terms of the Chen model for the calculation of activity coefficients, indicate that the polymorphic system in water and in water + ethanol (ethanol/water ratio 0.1 ) is enantiotropic.

KW - Crystal polymorphism

KW - Crystallization

KW - Lithium hydroxide

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DO - 10.1002/crat.200711110

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VL - 43

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EP - 625

JO - Crystal Research and Technology

JF - Crystal Research and Technology

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Behavior of LiOH·H₂O crystals obtained by evaporation and by drowning out

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Keywords

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