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 journalArticlepeer-review

4 Scopus citations

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 languageEnglish
Pages (from-to)616-625
Number of pages10
JournalCrystal Research and Technology
Volume43
Issue number6
DOIs
StatePublished - Jun 2008
Externally publishedYes

Keywords

  • Crystal polymorphism
  • Crystallization
  • Lithium hydroxide

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