Dechlorination of polyvinyl chloride electric wires by hydrothermal treatment using K2CO3 in subcritical water

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Title: Dechlorination of polyvinyl chloride electric wires by hydrothermal treatment using K2CO3 in subcritical water
Authors: Gandon-Ros, Gerard | Soler, Aurora | Aracil, Ignacio | Gómez-Rico, María Francisca
Research Group/s: Residuos, Energía, Medio Ambiente y Nanotecnología (REMAN)
Center, Department or Service: Universidad de Alicante. Departamento de Ingeniería Química | Universidad de Alicante. Instituto Universitario de Ingeniería de los Procesos Químicos
Keywords: Hydrothermal process | Dechlorination efficiency | PVC electric wires | Alkaline additive | Potassium carbonate
Knowledge Area: Ingeniería Química
Issue Date: 1-Feb-2020
Publisher: Elsevier
Citation: Waste Management. 2020, 102: 204-211. doi:10.1016/j.wasman.2019.10.050
Abstract: Polyvinyl chloride (PVC) waste generation has significantly increased in recent years and their disposal is considered a major environmental concern. Removal techniques of chlorine from PVC waste are being studied to minimize a negative environmental impact. In this work, the use of K2CO3 as an alkaline additive to improve the dechlorination efficiency (DE) in the hydrothermal degradation of PVC wires was studied. Different experiments were carried out varying both temperature (175, 200, 225, 235 and 250 °C) and K2CO3 concentration (0.025, 0.050 and 0.125 M), using a solid/liquid ratio of 1:5 in order to determine the evolution of the dechlorination efficiency with time. About 4.66, 21.1, 24.4, 45.7 and 92.6 wt% of chlorine in PVC wire was removed during hydrothermal dechlorination (HTD) with an additive/chlorine ratio of 1:25 (K2CO3 solution of 0.050 M) at 175, 200, 225, 235 and 250 °C, respectively. Optimal additive/chlorine ratio decreased to 1:50 (K2CO3 solution of 0.025 M) at 250 °C, obtaining a dechlorination degree of 99.1% after 4 h without the need of metallic catalysts. Concerning the solid phase behavior during dechlorination, a linear correlation between the DE reached and the weight loss of PVC was found.
Sponsor: Support for this work was provided by the CTQ2016-76608-R project and the scholarship BES-2017-080382 from the Ministry of Economy Industry and Competitiveness (Spain).
ISSN: 0956-053X (Print) | 1879-2456 (Online)
DOI: 10.1016/j.wasman.2019.10.050
Language: eng
Type: info:eu-repo/semantics/article
Rights: © 2019 Elsevier Ltd.
Peer Review: si
Publisher version:
Appears in Collections:INV - REMAN - Artículos de Revistas
INV - I4CE - Artículos de Revistas

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