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An Isoperibolic Reaction Twin Calorimeter for Investigating Precipitation
Author(s) -
Velich V.,
Söhnel O.,
CostaBauzá A.,
Kroupa M.
Publication year - 1992
Publication title -
crystal research and technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.377
H-Index - 64
eISSN - 1521-4079
pISSN - 0232-1300
DOI - 10.1002/crat.2170270824
Subject(s) - supersaturation , nucleation , precipitation , thermodynamics , calorimeter (particle physics) , reaction calorimeter , enthalpy , chemistry , calorimetry , standard enthalpy of formation , kinetics , meteorology , physics , quantum mechanics , detector , optics
Abstract An isoperibolic reaction twin calorimeter is described and its application to studying precipitation is shown. This technique is suitable for determining both the total reaction enthalpy and also, in specific ranges of supersaturation, kinetics of the process. The total enthalpy of BaSO 4 and CaC 2 O 4 · H 2 O precipitation at 25 °C was determined as −16.2 and −18.1 kJ mol −1 , respectively. The spontneous precipitation of these compounds affected by mixing reactant solutions together proceeds through initial surge of nucleation and fast crystal growth that steeply diminishes. No major wave of secondary nucleation during precipitation was observed.