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Effect of Fe(III) Impurity on the Antisolvent Crystallization of Aqueous Ammonium Dihydrogen Phosphate Solutions
Author(s) -
MielniczekBrzóska Ewa,
Sangwal Keshra,
Borc Jarosław
Publication year - 2020
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.201900213
Subject(s) - impurity , crystallization , nucleation , aqueous solution , crystallite , ammonium dihydrogen phosphate , ammonium , chemistry , ammonium phosphate , phosphate , materials science , analytical chemistry (journal) , inorganic chemistry , crystallography , chromatography , organic chemistry , fertilizer
Experimental results of a study of the effect of FeCl 3 impurity on the antisolvent crystallization of ammonium dihydrogen phosphate, involving processes of formation of 3D nuclei and growth of these nuclei, from its aqueous solutions saturated at 30 °C and containing different impurity concentrations c i from in situ measurements of temperatures of saturated solutions and pure water as functions of feeding time t of antisolvent ethanol at predefined rates R A are described and discussed. The processes of formation of 3D nuclei and growth of these nuclei are studied in terms of the maximum antisolvent content Δ x maxN and Δ x maxG , determined from intervals of temperature difference ( T s − T w ) = Δ T < 0 and Δ T > 0, respectively, obtained from measurements of temperature T s and T w of saturated solution, without and with impurity, and pure water. It is found that: 1) the processes of 3D nucleation in antisolvent crystallization from solutions containing impurities can be explained in the framework of theoretical expressions such as a Nývlt‐like relation and an approach based on 3D‐nucleation theory, and 2) adsorption of impurity particles accounts for the increase in the values of antisolvent contents Δ x maxN and Δ x maxG of solutions during 3D nucleation and growth of crystallites.