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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Influence of the bed geometry on the kinetics of the extraction of clove bud oil with supercritical CO2

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Author(s):
Zabot, Giovani L. [1] ; Moraes, Moyses N. [1] ; Petenate, Ademir J. [2] ; Meireles, M. Angela A. [1]
Total Authors: 4
Affiliation:
[1] Univ Estadual Campinas, Sch Food Engn, LASEFI DEA FEA, BR-13083862 Campinas, SP - Brazil
[2] EDTI Proc Improvement, BR-13085170 Campinas, SP - Brazil
Total Affiliations: 2
Document type: Journal article
Source: JOURNAL OF SUPERCRITICAL FLUIDS; v. 93, n. SI, p. 56-66, SEP 2014.
Web of Science Citations: 30
Abstract

There is a need for scientific research that evaluates the influence of important process variables on the scale up of supercritical technology. For supercritical fluid extraction (SFE), one of these variables is the extractor's bed geometry, which can be defined by the ratio of the bed height (HB) to the bed diameter (DB). A systematic study is needed to select suitable criteria that can be used to obtain similar extraction curves among beds with different geometries. In this study, maintaining a constant ratio of solvent mass to feed mass for two beds with 1-L volumes but different geometries (E-1: HB/DB = 7.1; E-2: H-B/D-B = 2.7) was confirmed as a successful scale up criterion. For constant values of the temperature, pressure and bed porosity, there is experimental evidence that the mass transfer rate is equal in the two beds when the solvent flow rate is high. When 0.6 kg of clove buds was packed in the beds, the extraction rates were 2.10 +/- 0.08 and 2.3 +/- 0.1 g extract/min for beds E-1 and E-2, respectively. However, when the solvent flow rate was lower, the extraction rates were 0.93 +/- 0.06 and 1.12 +/- 0.02 g extract/min for beds E-1 and E-2, respectively. This difference in behavior between the extraction beds is associated with the axial dispersion of the fluid, which is more pronounced when the H-B/D-B ratio is increased. Thin particles tend to compact in the beds with high HB/DB ratios, which shorten the solvent passage. Non-isothermal profiles and differences in chemical composition of the extracts were also observed: 17% more alpha-humulene and 9% more eugenol were extracted in E-1 and E-2, respectively. (C) 2013 Elsevier B.V. All rights reserved. (AU)

FAPESP's process: 09/17234-9 - Obtaining anthocyanins, carotenoids, flavonoids, volatile oils, and tocotrienols by supercritical technology: process parameters and chemical characterization of extracts
Grantee:Maria Angela de Almeida Meireles Petenate
Support type: Regular Research Grants
FAPESP's process: 11/23665-2 - Obtaining bioactive compounds from clove and rosemary using supercritical technology: influence of the bed geometry, process intensification and cost of manufacturing of extracts
Grantee:Giovani Leone Zabot
Support type: Scholarships in Brazil - Doctorate (Direct)