Journal article

Influence of Phenol on the crystallization kinetics and quality of ice and sodium sulfate decahydrate during eutectic freeze crystallization


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Publication Details

Author list: Becheleni EMA, Rodriguez-Pascual M, Lewis AE, Rocha SDF

Publisher: American Chemical Society

Publication year: 2017

Journal: Industrial & Engineering Chemistry Research

Journal name: Industrial and Engineering Chemistry Research

Volume number: 56

Start page: 11926

End page: 11935

Total number of pages: 10

ISSN: 0888-5885

eISSN: 1520-5045

URL: https://api.elsevier.com/content/abstract/scopus_id/85031795782


Abstract

The presence of impurities in solution during crystallization can
influence the crystallization kinetics of the desired product.
Consequently, this affects the product quality parameters such as the
crystal size distribution (CSD), purity, and morphology. This paper
focuses on the application of eutectic freeze crystallization (EFC) to
the purification of petrochemical brine rich in sulfate salts. The
effect of phenol on the CSD, nucleation and growth rates, purity, and
morphology of ice and sodium sulfate decahydrate crystals was evaluated
using a batch EFC setup. Nucleation and growth rates were obtained from
in situ image acquisition and analyses. In the presence of 0.2 wt %
phenol, larger crystals were obtained for both ice and sodium sulfate
decahydrate due to increased growth rates and reduced nucleation rates.
The crystal habit of both ice and salt was not modified by the phenol
impurity. Ice crystals presented elongated disk shapes and dendritic
habit, and crystal sizes up to 1000 μm were obtained. Salt particles
exhibited prismatic shape and monoclinic class as expected for Na2SO4·10H2O.
Ice purity of about 97% was obtained before washing in the presence of
phenol. Three washing cycles increased the ice purity to 100% implying
that impurities were physically adhered on the ice surfaces and not
incorporated into the crystal lattice, which deserves additional studies
to verify this proposal. X-ray diffraction (XRD) analyses of salt
crystals confirmed that Na2SO4·10H2O with the structure of thenardite was crystallized. Any other phase was detected.


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Last updated on 2018-23-09 at 09:29