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Open AccessArticle

The Dependence of Effective Distribution Coefficient on Growth Rate and Mass Transfer Coefficient for P-xylene in Solid-Layer Melt Crystallization

1
Department of Chemical and Materials Engineering, Chang Gung University, Taoyuan 333, Taiwan
2
Department of Urology, Chang Gung Memorial Hospital Linkou, Taoyuan 333, Taiwan
Processes 2020, 8(2), 175; https://doi.org/10.3390/pr8020175
Received: 3 January 2020 / Revised: 29 January 2020 / Accepted: 1 February 2020 / Published: 4 February 2020
The solid-layer growth kinetics and resulting crystal purity for a well-mixed p-xylene (PX) melt with impurity of o-xylene (OX) or ethylbenzene (EB) were studied in this work at various cooling temperatures. A correlation based on the energy balance was adopted to describe the dependence of growth rate on the temperature gradient between melt and cooling medium. An empirical equation based on the mass balance was proposed to relate the effective distribution coefficient with growth rate, mass transfer coefficient, and impurity mole fraction. By fitting the proposed empirical equation with the experimental effective distribution coefficients, the mass transfer coefficients for the PX/OX and PX/EB mixtures were retrieved respectively.
Keywords: crystallization; growth rate; melt; para-xylene; impurity crystallization; growth rate; melt; para-xylene; impurity
MDPI and ACS Style

Shiau, L.-D. The Dependence of Effective Distribution Coefficient on Growth Rate and Mass Transfer Coefficient for P-xylene in Solid-Layer Melt Crystallization. Processes 2020, 8, 175.

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