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Title: The nucleation kinetics of calcium sulfate dihydrate in NaCl solutions up to 6 m and 90 C

Abstract

The crystallization of calcium sulfate from aqueous solutions with NaCl is both geological and industrial interest because NaCl is the dominant solute in natural brines and many industrial fluids. Induction periods for the nucleation of calcium sulfate dihydrate were experimentally determined as a function of supersaturation in NaCl solutions from 0 to 6 m at 25 C and in 3.0-m NaCl solutions at temperatures from 25 to 90 C. Using classic nucleation theory, the interfacial tension between gypsum and 3.0-m NaCl solution was estimated to be about 39 mJ/m[sup 2] at 25 C and increases with increasing temperature (to 63 mJ/m[sup 2] at 90 C). It was observed that the induction period decreases with increasing NaCl concentrations up to 3 m and then starts to increase slightly at a given temperature and saturation state. The electrolyte effect on nucleation was proportional to the enhanced solubility of calcium sulfate dihydrate in NaCl solutions. This phenomenon may result from decreased crystal-solution interfacial tensions caused by increased gypsum solubility in electrolyte solutions. Although anhydrite is the thermodynamically stable phase at elevated temperatures and in concentrated solutions, only gypsum was nucleated.

Authors:
; ;  [1]
  1. Rice Univ., Houston, TX (United States). Dept. of Environmental Science and Engineering
Publication Date:
OSTI Identifier:
7206183
Resource Type:
Journal Article
Journal Name:
Journal of Colloid and Interface Science; (United States)
Additional Journal Information:
Journal Volume: 162:2; Journal ID: ISSN 0021-9797
Country of Publication:
United States
Language:
English
Subject:
15 GEOTHERMAL ENERGY; 02 PETROLEUM; 32 ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATION; GEOTHERMAL WELLS; SCALING; GYPSUM; SOLUBILITY; OIL WELLS; WATER TREATMENT PLANTS; AQUEOUS SOLUTIONS; BRINES; CONCENTRATION RATIO; SODIUM CHLORIDES; ALKALI METAL COMPOUNDS; CHLORIDES; CHLORINE COMPOUNDS; DISPERSIONS; HALIDES; HALOGEN COMPOUNDS; MINERALS; MIXTURES; SODIUM COMPOUNDS; SOLUTIONS; SULFATE MINERALS; WELLS; 152001* - Geothermal Data & Theory- Properties of Aqueous Solutions; 020300 - Petroleum- Drilling & Production; 320305 - Energy Conservation, Consumption, & Utilization- Industrial & Agricultural Processes- Industrial Waste Management

Citation Formats

He, S, Oddo, J E, and Tomson, M B. The nucleation kinetics of calcium sulfate dihydrate in NaCl solutions up to 6 m and 90 C. United States: N. p., 1994. Web. doi:10.1006/jcis.1994.1042.
He, S, Oddo, J E, & Tomson, M B. The nucleation kinetics of calcium sulfate dihydrate in NaCl solutions up to 6 m and 90 C. United States. https://doi.org/10.1006/jcis.1994.1042
He, S, Oddo, J E, and Tomson, M B. 1994. "The nucleation kinetics of calcium sulfate dihydrate in NaCl solutions up to 6 m and 90 C". United States. https://doi.org/10.1006/jcis.1994.1042.
@article{osti_7206183,
title = {The nucleation kinetics of calcium sulfate dihydrate in NaCl solutions up to 6 m and 90 C},
author = {He, S and Oddo, J E and Tomson, M B},
abstractNote = {The crystallization of calcium sulfate from aqueous solutions with NaCl is both geological and industrial interest because NaCl is the dominant solute in natural brines and many industrial fluids. Induction periods for the nucleation of calcium sulfate dihydrate were experimentally determined as a function of supersaturation in NaCl solutions from 0 to 6 m at 25 C and in 3.0-m NaCl solutions at temperatures from 25 to 90 C. Using classic nucleation theory, the interfacial tension between gypsum and 3.0-m NaCl solution was estimated to be about 39 mJ/m[sup 2] at 25 C and increases with increasing temperature (to 63 mJ/m[sup 2] at 90 C). It was observed that the induction period decreases with increasing NaCl concentrations up to 3 m and then starts to increase slightly at a given temperature and saturation state. The electrolyte effect on nucleation was proportional to the enhanced solubility of calcium sulfate dihydrate in NaCl solutions. This phenomenon may result from decreased crystal-solution interfacial tensions caused by increased gypsum solubility in electrolyte solutions. Although anhydrite is the thermodynamically stable phase at elevated temperatures and in concentrated solutions, only gypsum was nucleated.},
doi = {10.1006/jcis.1994.1042},
url = {https://www.osti.gov/biblio/7206183}, journal = {Journal of Colloid and Interface Science; (United States)},
issn = {0021-9797},
number = ,
volume = 162:2,
place = {United States},
year = {1994},
month = {2}
}