Crystallization kinetics of the borax decahydrate

A. A. Ceyhan; Ö Sahin; A. N. Bulutcu

doi:10.1016/j.jcrysgro.2007.01.015

Crystallization kinetics of the borax decahydrate

A. A. Ceyhan, Ö Sahin^*, A. N. Bulutcu

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

13 Citations (Scopus)

Abstract

The growth and dissolution rates of borax decahydrate have been measured as a function of supersaturation for various particle sizes at different temperature ranges of 13 and 50 °C in a laboratory-scale fluidized bed crystallizer. The values of mass transfer coefficient, K, reaction rate constant, k_r and reaction rate order, r were determined. The relative importances of diffusion and integration resistance were described by new terms named integration and diffusion concentration fraction. It was found that the overall growth rate of borax decahydrate is mainly controlled by integration (reaction) steps. It was also estimated that the dissolution region of borax decahydrate, apart from other materials, is controlled by diffusion and surface reaction. Increasing the temperature and particle size cause an increase in the values of kinetic parameters (K_g, k_r and K). The activation energies of overall, reaction and mass transfer steps were determined as 18.07, 18.79 and 8.26 kJmol^-1, respectively.

Original language	English
Pages (from-to)	440-447
Number of pages	8
Journal	Journal of Crystal Growth
Volume	300
Issue number	2
DOIs	https://doi.org/10.1016/j.jcrysgro.2007.01.015
Publication status	Published - 15 Mar 2007
Externally published	Yes

Keywords

A1. Interfaces
A2. Growth from solution
A2. Seed crystal
B1. Borates

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10.1016/j.jcrysgro.2007.01.015

Cite this

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title = "Crystallization kinetics of the borax decahydrate",

abstract = "The growth and dissolution rates of borax decahydrate have been measured as a function of supersaturation for various particle sizes at different temperature ranges of 13 and 50 °C in a laboratory-scale fluidized bed crystallizer. The values of mass transfer coefficient, K, reaction rate constant, kr and reaction rate order, r were determined. The relative importances of diffusion and integration resistance were described by new terms named integration and diffusion concentration fraction. It was found that the overall growth rate of borax decahydrate is mainly controlled by integration (reaction) steps. It was also estimated that the dissolution region of borax decahydrate, apart from other materials, is controlled by diffusion and surface reaction. Increasing the temperature and particle size cause an increase in the values of kinetic parameters (Kg, kr and K). The activation energies of overall, reaction and mass transfer steps were determined as 18.07, 18.79 and 8.26 kJmol-1, respectively.",

keywords = "A1. Interfaces, A2. Growth from solution, A2. Seed crystal, B1. Borates",

author = "Ceyhan, {A. A.} and {\"O} Sahin and Bulutcu, {A. N.}",

year = "2007",

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TY - JOUR

T1 - Crystallization kinetics of the borax decahydrate

AU - Ceyhan, A. A.

AU - Sahin, Ö

AU - Bulutcu, A. N.

PY - 2007/3/15

Y1 - 2007/3/15

N2 - The growth and dissolution rates of borax decahydrate have been measured as a function of supersaturation for various particle sizes at different temperature ranges of 13 and 50 °C in a laboratory-scale fluidized bed crystallizer. The values of mass transfer coefficient, K, reaction rate constant, kr and reaction rate order, r were determined. The relative importances of diffusion and integration resistance were described by new terms named integration and diffusion concentration fraction. It was found that the overall growth rate of borax decahydrate is mainly controlled by integration (reaction) steps. It was also estimated that the dissolution region of borax decahydrate, apart from other materials, is controlled by diffusion and surface reaction. Increasing the temperature and particle size cause an increase in the values of kinetic parameters (Kg, kr and K). The activation energies of overall, reaction and mass transfer steps were determined as 18.07, 18.79 and 8.26 kJmol-1, respectively.

AB - The growth and dissolution rates of borax decahydrate have been measured as a function of supersaturation for various particle sizes at different temperature ranges of 13 and 50 °C in a laboratory-scale fluidized bed crystallizer. The values of mass transfer coefficient, K, reaction rate constant, kr and reaction rate order, r were determined. The relative importances of diffusion and integration resistance were described by new terms named integration and diffusion concentration fraction. It was found that the overall growth rate of borax decahydrate is mainly controlled by integration (reaction) steps. It was also estimated that the dissolution region of borax decahydrate, apart from other materials, is controlled by diffusion and surface reaction. Increasing the temperature and particle size cause an increase in the values of kinetic parameters (Kg, kr and K). The activation energies of overall, reaction and mass transfer steps were determined as 18.07, 18.79 and 8.26 kJmol-1, respectively.

KW - A1. Interfaces

KW - A2. Growth from solution

KW - A2. Seed crystal

KW - B1. Borates

UR - http://www.scopus.com/inward/record.url?scp=33847743852&partnerID=8YFLogxK

U2 - 10.1016/j.jcrysgro.2007.01.015

DO - 10.1016/j.jcrysgro.2007.01.015

M3 - Article

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SN - 0022-0248

VL - 300

SP - 440

EP - 447

JO - Journal of Crystal Growth

JF - Journal of Crystal Growth

IS - 2

ER -

Crystallization kinetics of the borax decahydrate

Abstract

Keywords

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