Supercritical Technologies for the Valorization of Wine Industry By-Products
type: CreativeWork
description: This study aim at the valorization of wine industry by products; particularly on the extraction and characterization of grape seeds oil using supercritical CO2 (SC-CO2) and polyphenols from grape skins and defatted grape seeds using subcritical water (SW) and then, modeling of the kinetics of extractions and process economic analysis. The overall objective of the work is to develop recovery strategies for wine-making wastes in order to reduce their environmental impact and to valorize them in order to provide wine-makers with the possibility of selling by-products at a profitable price. To address the objectives, the work is divided into seven Chapters. In Chapter 1, some general overview and the fundamental of SC-CO2 and SW technologies along with emerging areas of applications are presented. Special emphasis is given to the work in the field of valorization of agro-industrial by-products. Then, the Chapter ends by stating the general and specific objectives of the thesis. The second Chapter is devoted to the characterization of grape seeds oil. To make the result more holistic, grape seeds from six grape cultivars were extracted using SC-CO2 in two subsequent harvesting years and the resulting oils were characterized. Comparative extractions were also performed by utilizing conventional solvent extraction using n-hexane and by mechanical press. The results testify the potentiality of grape seed oil as a source of unsaturated fatty acids and tocols. Moreover, they offers a clear picture of the similarities and differences among oils from different grape cultivars and obtained through different extraction techniques. The third Chapter is dedicated to compare the effectiveness of the models used to evaluate the kinetic of SC-CO2 extraction curves. Particularly, three models, the broken and intact cells (BIC), the shrinking core (SC), and the bridge (combined BIC-SC) models are critically analyzed. The objective of the Chapter is to objectively choose the best model t…
abstract: This study aim at the valorization of wine industry by products; particularly on the extraction and characterization of grape seeds oil using supercritical CO2 (SC-CO2) and polyphenols from grape skins and defatted grape seeds using subcritical water (SW) and then, modeling of the kinetics of extractions and process economic analysis. The overall objective of the work is to develop recovery strategies for wine-making wastes in order to reduce their environmental impact and to valorize them in order to provide wine-makers with the possibility of selling by-products at a profitable price. To address the objectives, the work is divided into seven Chapters. In Chapter 1, some general overview and the fundamental of SC-CO2 and SW technologies along with emerging areas of applications are presented. Special emphasis is given to the work in the field of valorization of agro-industrial by-products. Then, the Chapter ends by stating the general and specific objectives of the thesis. The second Chapter is devoted to the characterization of grape seeds oil. To make the result more holistic, grape seeds from six grape cultivars were extracted using SC-CO2 in two subsequent harvesting years and the resulting oils were characterized. Comparative extractions were also performed by utilizing conventional solvent extraction using n-hexane and by mechanical press. The results testify the potentiality of grape seed oil as a source of unsaturated fatty acids and tocols. Moreover, they offers a clear picture of the similarities and differences among oils from different grape cultivars and obtained through different extraction techniques. The third Chapter is dedicated to compare the effectiveness of the models used to evaluate the kinetic of SC-CO2 extraction curves. Particularly, three models, the broken and intact cells (BIC), the shrinking core (SC), and the bridge (combined BIC-SC) models are critically analyzed. The objective of the Chapter is to objectively choose the best model t…
author: Duba, Kurabachew Simon
language: eng
keywords: Settore ING-IND/27 - Chimica Industriale e Tecnologica, Settore ING-IND/25 - Impianti Chimici, Settore ING-IND/26 - Teoria dello Sviluppo dei Processi Chimici, Settore ING-IND/24 - Principi di Ingegneria Chimica
date published: 2015
date modified: 2026-07-24T05:04:33Z
provider: Università degli Studi di Trento
publisher: Networked Digital Library of Theses and Dissertations
type: WebPage
source organization: Università degli studi di Trento

PropertyValue
property ID: Handle
value: https://hdl.handle.net/11572/367970

PropertyValue
property ID: DOI
value: 10.15168/11572_367970