BIBLIOS

Document type
Conference papers

Document subtype
Abstract

Title
Micronization of Calcium Acetate from a Food Residue Using Supercritical Antisolvent Precipitation

Participants in the publication
Luis C. S. Nobre (Author)
António M. F. Palavra (Author)
INSTITUTO SUPERIOR TÉCNICO
Mário J. F. Calvete (Author)
UNIVERSIDADE DE COIMBRA
Carlos A. Nieto de Castro (Author)
Dep. Química e Bioquímica
CQE
Beatriz P. Nobre (Author)
INSTITUTO SUPERIOR TÉCNICO

Summary
The food industry generates annually thousands of tons of egg shells around the globe. This important source of calcium carbonate has called the attention of the chemists for many applications in different areas. . In the catalysis perspective this raw material can be a source of calcium oxide, which can be used as a heterogeneous catalyst to produce, for example, biodiesel. On the other hand, one of the crucial points for the improvement of the catalysts is the anoarchitecture of the particles. A way to achieve this objective is the use of processes with supercritical fluids. The supercritical antisolvent process (SAS) has been used to produce micro or nanoparticles of different compounds for a wide range of applications. The study of the SAS experimental conditions (temperature, pressure, concentration and flow rate ratio) is important to optimize the size and morphology of the obtained particles. The aim of this work is to produce nanoparticles of calcium oxide from egg shells using the SAS micronization process. In order to attain this purpose, the calcium carbonate of the egg shells was derived into calcium acetate, which was then successfully micronized by\nthe SAS process. The micronized calcium acetate and the calcium oxide, obtained by the calcination of the former, were evaluated in terms of morphology and particle size by scanning electron microscopy analysis.

Editor(s)
Rui Moreira and Luísa Martins


Institution
UNIVERSIDADE DE LISBOA

Event
3rd Meeting of the CQUL (3ECQUL), Chemistry at Lisboa & 2018 Summer School, RULisboa, June, 27-29, 2018

Publication Identifiers

Address
Lisboa, Portugal

Organizers
Colegio de Química da Universidade de Lisboa

Publisher
Universidade de Lisboa

Collection
Abstract Book



Document Identifiers
URL - https://www.ulisboa.pt/sites/ulisboa.pt/files/public/bookabstracts_3ecqul.pdf

Keywords
Micronization Calcium Acetate Food Residue Supercritical Antisolvent Precipitation