Improving efficiency and feasibility of subcritical water debromination of printed circuit boards E-waste via potassium carbonate adding
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Título: | Improving efficiency and feasibility of subcritical water debromination of printed circuit boards E-waste via potassium carbonate adding |
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Autor/es: | Gandon-Ros, Gerard | Soler, Aurora | Aracil, Ignacio | Gómez-Rico, María Francisca | Conesa, Juan A. |
Grupo/s de investigación o GITE: | Residuos, Energía, Medio Ambiente y Nanotecnología (REMAN) | Ingeniería para la Economía Circular (I4CE) |
Centro, Departamento o Servicio: | Universidad de Alicante. Departamento de Ingeniería Química | Universidad de Alicante. Instituto Universitario de Ingeniería de los Procesos Químicos |
Palabras clave: | Hydrothermal process | Debromination efficiency | Printed circuit boards | E-Waste | Alkaline additive | Potassium carbonate |
Área/s de conocimiento: | Ingeniería Química |
Fecha de publicación: | 15-oct-2021 |
Editor: | Elsevier |
Cita bibliográfica: | Journal of Cleaner Production. 2021, 319: 128605. https://doi.org/10.1016/j.jclepro.2021.128605 |
Resumen: | Waste printed circuit boards (WCBs) were debrominated under hydrothermal treatment, using potassium carbonate as an alkaline additive to improve debromination efficiency (DE). Two different high-pressure reactors were used: a 1-L stirred reactor, where the evolution of the DE was followed over time at a low CO32−/Br− ratio (1:25), and an elementary 0.1-L non-stirred reactor, used to find the optimal parameters and to simplify the hydrothermal debromination (HTD) process. Considering both reactors, experiments were conducted changing the temperature (200 °C, 225 °C, 250 °C, 275 °C), and also the CO32−/Br− anionic ratio (1:50, 1:25, 1:10, 1:5, 1:2.5, 1:1, 2:1, 4:1) and the solid/liquid ratio (1:10, 1:5, 1:2) in the case of the 0.1-L reactor. No metallic catalyst was required. A maximum DE of about 98.9 wt % was reached in the agitated vessel at 275 °C after 4 h, with an additive/bromine ratio of 1:25. Similar DE (99.6 wt %) was also achieved in the non-stirred reactor at only 225 °C and after 2 h, using an additive/bromine ratio of 4:1 and a solid/liquid ratio of only 1:2. Concerning the solid phase behaviour during debromination, only 5 % of the net calorific value (NCV) was lost after a complete HTD treatment of WCB. |
Patrocinador/es: | Support for this work was granted by CTQ2016-76608-R project and the scholarship BES-2017-080382 from the Ministry of Economy, Industry and Competitiveness (Spain). |
URI: | http://hdl.handle.net/10045/117369 |
ISSN: | 0959-6526 (Print) | 1879-1786 (Online) |
DOI: | 10.1016/j.jclepro.2021.128605 |
Idioma: | eng |
Tipo: | info:eu-repo/semantics/article |
Derechos: | © 2021 The Authors. Published by Elsevier Ltd. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/). |
Revisión científica: | si |
Versión del editor: | https://doi.org/10.1016/j.jclepro.2021.128605 |
Aparece en las colecciones: | INV - I4CE - Artículos de Revistas INV - REMAN - Artículos de Revistas |
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