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Title: Measuring induction period for calcium sulfate dihydrate precipitation

Abstract

Homogeneous nucleation of CaSO{sub 4}{center_dot}2H{sub 2}O (gypsum) based on an optical diagnostic technique was studied within a supersaturation range of 1--4 at 25--90 C. The experiments were carried out using an experimental apparatus consisting of a batch crystallizer with the related measurement devices. Signals of scattered and transmitted light coming from a He-Ne laser source were analyzed to measure the induction period (t{sub ind}), that is, the time delay necessary for homogeneous nucleation to take place. As expected from theory, it was found that t{sub ind} decreases when either temperature or supersaturation increase; from the dependence of t{sub ind} on supersaturation, it was possible to distinguish between the mechanisms of homogeneous and heterogeneous nucleation. From the experimental data relative to homogeneous nucleation, the interfacial tension ({gamma}{sub s}) between CaSO{sub 4}{center_dot}2H{sub 2}O and the surrounding aqueous solution and the activation energy (E{sub att}) for CaSO{sub 4}{center_dot}2H{sub 2}O crystallization were evaluated. In particular, the dependence of t{sub ind} on temperature made it possible to evaluate E{sub att} at 30 kJ/mol and the dependence of t{sub ind} on supersaturation offered the value of {gamma}{sub s} to be about 37 mJ/m{sup 2}, which does not vary with temperature in the interval explored.

Authors:
 [1];  [2];  [3]
  1. Univ. di Napoli Federico II (Italy). Dipt. di Ingegneria Chimica
  2. CNR, Napoli (Italy). Istituto di Ricerche sulla Combustione
  3. Univ. di L`Aquila (Italy). Dipt. di Chimica, Ingegneria Chimica e Materiali
Publication Date:
OSTI Identifier:
329250
Resource Type:
Journal Article
Journal Name:
AIChE Journal
Additional Journal Information:
Journal Volume: 45; Journal Issue: 2; Other Information: PBD: Feb 1999
Country of Publication:
United States
Language:
English
Subject:
54 ENVIRONMENTAL SCIENCES; 01 COAL, LIGNITE, AND PEAT; CALCIUM SULFATES; HYDRATES; PRECIPITATION; LIME-LIMESTONE WET SCRUBBING PROCESSES; NUCLEATION; ACTIVATION ENERGY; SULFUR DIOXIDE; AIR POLLUTION CONTROL

Citation Formats

Lancia, A, Musmarra, D, and Prisciandaro, M. Measuring induction period for calcium sulfate dihydrate precipitation. United States: N. p., 1999. Web. doi:10.1002/aic.690450218.
Lancia, A, Musmarra, D, & Prisciandaro, M. Measuring induction period for calcium sulfate dihydrate precipitation. United States. https://doi.org/10.1002/aic.690450218
Lancia, A, Musmarra, D, and Prisciandaro, M. 1999. "Measuring induction period for calcium sulfate dihydrate precipitation". United States. https://doi.org/10.1002/aic.690450218.
@article{osti_329250,
title = {Measuring induction period for calcium sulfate dihydrate precipitation},
author = {Lancia, A and Musmarra, D and Prisciandaro, M},
abstractNote = {Homogeneous nucleation of CaSO{sub 4}{center_dot}2H{sub 2}O (gypsum) based on an optical diagnostic technique was studied within a supersaturation range of 1--4 at 25--90 C. The experiments were carried out using an experimental apparatus consisting of a batch crystallizer with the related measurement devices. Signals of scattered and transmitted light coming from a He-Ne laser source were analyzed to measure the induction period (t{sub ind}), that is, the time delay necessary for homogeneous nucleation to take place. As expected from theory, it was found that t{sub ind} decreases when either temperature or supersaturation increase; from the dependence of t{sub ind} on supersaturation, it was possible to distinguish between the mechanisms of homogeneous and heterogeneous nucleation. From the experimental data relative to homogeneous nucleation, the interfacial tension ({gamma}{sub s}) between CaSO{sub 4}{center_dot}2H{sub 2}O and the surrounding aqueous solution and the activation energy (E{sub att}) for CaSO{sub 4}{center_dot}2H{sub 2}O crystallization were evaluated. In particular, the dependence of t{sub ind} on temperature made it possible to evaluate E{sub att} at 30 kJ/mol and the dependence of t{sub ind} on supersaturation offered the value of {gamma}{sub s} to be about 37 mJ/m{sup 2}, which does not vary with temperature in the interval explored.},
doi = {10.1002/aic.690450218},
url = {https://www.osti.gov/biblio/329250}, journal = {AIChE Journal},
number = 2,
volume = 45,
place = {United States},
year = {1999},
month = {2}
}