Measurement of astaxanthin and squalene diffusivities in compressed liquid ethyl acetate by Taylor-Aris dispersion method
authors Zezere, B; Silva, JM; Portugal, I; Gomes, JRB; Silva, CM
nationality International
journal SEPARATION AND PURIFICATION TECHNOLOGY
author keywords Astaxanthin; Squalene; Diffusion coefficient; Ethyl acetate; Pressurized liquid
keywords BINARY DIFFUSION-COEFFICIENTS; SUPERCRITICAL-FLUID EXTRACTION; CARBON-DIOXIDE EXTRACTION; BIOACTIVE COMPOUNDS; SOLVENT SELECTION; INFINITE DILUTION; LENNARD-JONES; DENSE FLUIDS; HARD-SPHERE; WIDE RANGES
abstract An increasing demand of consumers for natural bioactive compounds has boosted the interest of the scientific community for vegetables and fruits, with many efforts being made to identify new bioactive compounds and to develop sustainable extraction methods that preserve the compounds bioactivity. Such is thicase of pressurized liquid extraction and supercritical fluid extraction using "green solvents" as supercritical CO2, ethanol, and ethyl acetate. The accurate design of these processes requires the knowledge of transport properties, namely, diffusion coefficients, D-12. Astaxanthin and squalene are two bioactive compounds whose D-12 values were measured in compressed liquid ethyl acetate using a chromatographic technique. For astaxanthin the D-12 values were in the range 0.817 x 10(-5) - 1.223 x 10(-5) cm(2) s(-1) (at 303.15-333.15 K and 1-100 bar) and for squalene they were in the range 1.052 x 10(-5) - 1.822 x 10(-5) cm(2) s(-1) (at 303.15-333.15 K and 1-150 bar). The influence of tem- perature, pressure and Stokes-Einstein coordinate was studied for both systems and explained with the most relevant theories of the literature.
publisher ELSEVIER
issn 1383-5866
year published 2020
volume 234
digital object identifier (doi) 10.1016/j.seppur.2019.116046
web of science category Engineering, Chemical
subject category Engineering
unique article identifier WOS:000491627200057
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