Production of alginate-based aerogel particles using supercritical drying: Experiment, comprehensive mathematical model, and optimization

Autor(es)

Hatami, Tahmasb ^{[1, 2]} ; Vigano, Juliane ^{[1, 3]} ; Innocentini Mei, Lucia Helena ^[2] ; Martinez, Julian ^[1]

Afiliação do(s) autor(es)

^[1] Univ Estadual Campinas, Sch Food Engn, Food Engn Dept, UNICAMP, R Monteiro Lobato 80, BR-13083862 Campinas, SP - Brazil

^[2] Univ Estadual Campinas, Sch Chem Engn, Dept Mat Engn & Bioproc, UNICAMP, Av Albert Einstein 500, BR-13083852 Campinas, SP - Brazil

^[3] Univ Fed Sao Paulo, Inst Environm Chem & Pharmaceut Sci, Dept Chem Engn, UNIFESP, R Sao Nicolau 210, BR-09913030 Diadema, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: JOURNAL OF SUPERCRITICAL FLUIDS; v. 160, JUN 1 2020.
• Citações Web of Science: 0

Resumo

Alginate-based aerogel particles were produced by dripping alginate solution (2%, w/w) into CaCl2 solution (100 mM) followed by solvent exchange and supercritical drying (SCD). Hydrogel particles were first produced by the dripping method. Beads were separated from the CaCl2 cross-linking solution by filtration. Then, the solvent exchange was performed at room temperature by the immersion of the particles into ethanol/water mixtures. Next, the obtained alcogels were submitted to a SCD process at 12 MPa, 40 degrees C, and CO2 flow rate from 0.27 to 0.84 kg/h, and the recovered ethanol was gravimetrically measured. Finally, a comprehensive mathematical model was employed to describe the SCD process using the law of conservation of mass. The model, which resulted in two partial differential equations for the fluid and solid phases, was numerically solved using the finite difference method, successfully validated by the experimental data and employed in the sensitivity analysis and optimization. (C) 2020 Elsevier B.V. All rights reserved. (AU)

• Processo FAPESP: 18/18722-6 - Desenvolvimento uma unidade supercrítico de formação de espuma por deposição para fabricação de suportes (scaffolds) 3D: Caracterização, modelagem matemática e otimização
• Beneficiário: Tahmasb Hatami
• Modalidade de apoio: Bolsas no Brasil - Pós-Doutorado
• Processo FAPESP: 17/23670-2 - Biorrefinaria para aproveitamento de subprodutos do processamento de maracujá com tecnologias de alta pressão
• Beneficiário: Julian Martínez
• Modalidade de apoio: Auxílio à Pesquisa - Regular
• Processo FAPESP: 11/06083-0 - Emulsificação por microcanais
• Beneficiário: Rosiane Lopes da Cunha
• Modalidade de apoio: Auxílio à Pesquisa - Regular