Effect of thermal history of aqueous solutions of KCl on the metastable zone width

1984 ◽  
Vol 49 (3) ◽  
pp. 559-569 ◽  
Author(s):  
Jaroslav Nývlt
Keyword(s):  
Aqueous Solution ◽  
Aqueous Solutions ◽  
Thermal History ◽  
Equilibrium Solubility ◽  
Metastable Zone Width ◽  
Zone Width ◽  
Preceding Experiment ◽  
History Of ◽  
Metastable Zone ◽  
The Given

The metastable zone width of an aqueous solution of KCI was measured as a function of the time and temperature of overheating above the equilibrium solubility temperature. It has been found that when the experiments follow close upon one another, the parameters of the preceding experiment affect the results of the experiment to follow.The results are interpreted in terms of hypotheses advanced in the literature to account for the effect of thermal history of solution. The plausibility and applicability of these hypotheses are assessed for the given cause of aqueous solution of a well soluble electrolyte.

Probable mechanism of the effect of thermal history of solution on the metastable zone width

1984 ◽  
Vol 49 (9) ◽  
pp. 2045-2049 ◽  
Author(s):  
Jaroslav Nývlt
Keyword(s):  
Aqueous Solution ◽  
Thermal History ◽  
Transformation Temperature ◽  
Smooth Curve ◽  
Probable Mechanism ◽  
Metastable Zone Width ◽  
Zone Width ◽  
History Of ◽  
Metastable Zone

The metastable zone width of an aqueous solution of FeSO4 has been measured as a function of the temperature of solution overheating. For the solution overheated to a temperature lower than that of hydrate transformation, the data fit to a continuous, smooth curve, while points obtained in overheating the solution above the hydrate transformation temperature lie distinctly above the extension of the curve. Of hypotheses advanced in the literature to explain the thermal history of solution, only that based on redistribution of subcritical cluster sizes of crystallizing substance seems compatible with the observation.

scholarly journals Sugar Industry: Effect of Dextran Concentrations on the Sucrose Crystallization in Aqueous Solutions

2019 ◽  
Vol 2019 ◽  
pp. 1-6 ◽  
Author(s):  
Abdelali Borji ◽  
Fatima-Ezzahra Borji ◽  
Abdelaziz Jourani
Keyword(s):  
Experimental Data ◽  
Aqueous Solutions ◽  
Growth Process ◽  
Sugar Industry ◽  
Nucleation Kinetics ◽  
Metastable Zone Width ◽  
Zone Width ◽  
Industry Effect ◽  
Instantaneous Nucleation ◽  
Metastable Zone

Using the spectrophotometric method, as a new method, the influence of dextran on the sucrose solubility and metastable zone width has been studied. In agreement with the literature the experimental data show that the dextran has a negligible effect on the sucrose solubility. The results also show that this impurity decreases the sucrose metastable zone width. The study of the nucleation kinetics performed, using Nyvlt’s approach, shows that the dextran accelerates the nucleation and that the nuclei are formed in the solution by instantaneous nucleation. The presence of dextran in the system causes a decrease in the growth rate of sucrose. The growth process of sucrose is governed by a Birth and Spread mechanism. The kinetic parameters of sucrose growth in aqueous solutions without and with dextran were estimated.

Metastable zone-width of some aqueous solutions

1970 ◽  
Vol 6 (2) ◽  
pp. 151-162 ◽  
Author(s):  
Jaroslav Nývlt ◽  
Rudolf Rychlý ◽  
Jaroslav Gottfried ◽  
Jiřina Wurzelová
Keyword(s):  
Aqueous Solutions ◽  
Metastable Zone Width ◽  
Zone Width ◽  
Metastable Zone

Crystallization of Pentaerythritol I. Solubility, Density and Metastable Zone Width

1994 ◽  
Vol 59 (6) ◽  
pp. 1261-1269 ◽  
Author(s):  
Miloslav Karel ◽  
Jaroslav Nývlt ◽  
Angelo Chianese
Keyword(s):  
Aqueous Solutions ◽  
Nucleation Rate ◽  
Laboratory Experiments ◽  
Metastable Zone Width ◽  
Zone Width ◽  
Kinetics Of Crystallization ◽  
Primary Nucleation ◽  
Metastable Zone ◽  
Width Measurements ◽  
Kinetics Of

Solubility of pentaerythritol in water has been determined using literature data, the polythermal method and the dry residue method. Densities of its aqueous solutions have been measured using a pycnometer. Kinetics of crystallization of the pentaerythritol has been determined in laboratory experiments. In this paper, metastable zone width measurements have been employed for the assessment of the primary nucleation rate.

DETERMINATION OF THE METASTABLE ZONE WIDTH OF GLYCINE AQUEOUS SOLUTIONS FOR BATCH CRYSTALLIZATIONS

2011 ◽  
Vol 198 (8) ◽  
pp. 1004-1017 ◽  
Author(s):  
Johanne Bonnin-Paris ◽  
Stéphane Bostyn ◽  
Jean-Louis Havet ◽  
Henri Fauduet
Keyword(s):  
Aqueous Solutions ◽  
Metastable Zone Width ◽  
Zone Width ◽  
Metastable Zone
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