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Determination of Mass Transfer Coefficients for Crystal Growth of Nitrate Salts
Author(s) -
Graber T. A.,
Taboada M. E.,
Alvarez M. N.,
Schmidt E. H.
Publication year - 1999
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/(sici)1521-4079(199912)34:10<1269::aid-crat1269>3.0.co;2-3
Subject(s) - supersaturation , potassium nitrate , chemistry , mass transfer , sodium nitrate , aqueous solution , saturation (graph theory) , diffusion , crystal growth , nitrate , analytical chemistry (journal) , potassium , mass transfer coefficient , solubility , crystal (programming language) , nitrogen , kinetics , thermodynamics , inorganic chemistry , chromatography , crystallography , organic chemistry , physics , mathematics , combinatorics , quantum mechanics , computer science , programming language
In this paper, the crystal growth of sodium nitrate and potassium nitrate from aqueous solutions, in a perfectly stirred batch crystallizer, has been studied considering the effect of temperature, supersaturation degree, and the size of seed crystal growth rate. The mass transfer coefficients obtained correlated with Re, Sc and NL dimensionaless numbers. Supersaturation curve determination using a 0.5 mW He‐Ne laser, connected to an automated data acquisition system, was the first stage of the study. The supersaturation and saturation curves were closely parallel with average DT value of 4.1 and 6.8 °C for KNO 3 and NaNO 3 respectively. For the growth kinetics order, unit values were found for both salts, with diffusion as a controlling stage.