Article

On-line determination of supersaturation of a kcl-nacl aqueous solution based on density measurement

  1. Terry P. Redman,
  2. Sohrab Rohani*

Article first published online: 27 MAR 2009

DOI: 10.1002/cjce.5450720110

Issue

The Canadian Journal of Chemical Engineering

The Canadian Journal of Chemical Engineering

Volume 72, Issue 1, pages 64–71, February 1994

Additional Information

How to Cite

Redman, T. P. and Rohani, S. (1994), On-line determination of supersaturation of a kcl-nacl aqueous solution based on density measurement. Can. J. Chem. Eng., 72: 64–71. doi: 10.1002/cjce.5450720110

Author Information

  1. Department of Chemical Engineering, University of Saskatchewan, Saskatoon, Saskatchewan S7N OW0

*Department of Chemical Engineering, University of Saskatchewan, Saskatoon, Saskatchewan S7N OW0

Publication History

  1. Issue published online: 27 MAR 2009
  2. Article first published online: 27 MAR 2009
  3. Manuscript Accepted: 31 AUG 1993
  4. Manuscript Revised: 27 AUG 1993
  5. Manuscript Received: 6 APR 1993

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Keywords:

  • Keywords: saturation temperature;
  • supersaturation;
  • solubilities;
  • aqueous NaCI-KCI solution;
  • KCI crystallization

Abstract

A method is developed for the calculation of the saturation temperature of a KCI-NaCI aqueous solution, based on the measurement of the density and temperature of a sample solution, and prior knowledge of the NaCl concentration. Experimental density and solubility data for solutions saturated with KCI in the temperature range of 299 to 321 K with concentrations of NaCl greater than 0.200 kg/kg H2O were used to develop the empirical correlation allowing the calculation of the solution saturation level.

The method is applicable in the on-line determination of the level of supersaturation in a KCI crystallizer in which the NaCl concentration is known. Knowledge of the prevailing supersaturation is necessary for the control of crystal purity and crystal size distribution in industrial potash crystallizers.

On a mis au point une méthode de calcul de la température de saturation d'une solution aqueuse de KCI=NaCl baséc sur la mesure de la masse volumique et de la température d'une solution échantillon ainsi que la connaissance préable de la concentration de NaCl. Des données expérimentales de masse volumique et de solubilité pour des solutions saturkes en KCI dans une gamme de températures de 299 à 321 K à des concentrations de NaCl supérieures à 0,2 kg/kg H2O, ont été utilisées pour mettre au point une corrélation empirique permettant le calcul du niveau de saturation de la solution.

La méthode est applicable é la détermination en ligne du niveau de sursaturation dans un cristallisoir de KCI dans lequel la concentration de NACl est connue. La connaissance de la sursaturation dominante est nécessaire pour le contrble de la pureté du cristal et la distribution de taille des cristaux dans les cristallisoirs de potasse industriels.

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