THERMAL SCIENCE

International Scientific Journal

Bojana Božilović

,

Bojan Ž Janković

,

Milena Pijović-Radovanović

,

Hadi Waisi

,

Milena Marinović-Cincović

,

Sanja Krstić

,

Vladimir M. Dodevski

THERMO-CHEMICAL CONVERSION OF CIGARETTE BUTT FILTERS WASTE THROUGH PYROLYSIS PROCESS USING THERMAL ANALYSIS TECHNIQUES

ABSTRACT
Thermo-chemical conversion of cigarette butt filters (CBF) waste was investigated using various thermal analysis techniques (simultaneous TG-DTG-DTA and DSC methods) at different heating rates in an inert atmosphere. Thermo- and thermo-physical properties of waste material were discussed, from the point of view of chemical structure and the influence of experimental parameters on the conversion process. It was established that acetyl groups of plasticizer (triacetin) interact with cellulose acetate through dipolar interactions and hydrogen bonding’s. Influence of these polar interactions can affect the position of glass transition temperature, Tg, of CBF. Based on estimated value of Tg from DSC analysis, it was found that cellulose acetate present in CBF has degree of substitution equals to 2.8, where the presence of cellulose triacetate was confirmed. It was assumed that an increase of degree of substitution leads to decline in the crystallinity. A decline of crystallinity causes the reduction of hydroxyl groups, leading to less organized chains, and whereby decreasing of inter-molecular interactions through hydrogen bonding. Based on the examination of thermophysical characteristics of the tested material, it was found that both, the heat capacity and the thermal inertia of material linearly increase with temperature, during pyrolysis progression. It was concluded that the type of bio-char produced in this process would have a large capacity to store the heat, which may depend on the formed particles size diameter and porosity. Furthermore, it was inferred that magnitude drops of thermal conductivity, κ, after Tg depends on the material fibrillation.
KEYWORDS
industrial waste, pyrolysis, thermal analysis, glass transition, thermophysical properties, heat-resistance
PAPER SUBMITTED: 2023-05-20
PAPER REVISED: 2023-06-10
PAPER ACCEPTED: 2023-06-13
PUBLISHED ONLINE: 2023-07-16
DOI REFERENCE: https://doi.org/10.2298/TSCI230520153B
CITATION EXPORT: view in browser or download as text file
THERMAL SCIENCE YEAR 2024, VOLUME 28, ISSUE Issue 1, PAGES [513 - 527]
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Thermo-chemical conversion of cigarette butt filters waste through pyrolysis process using thermal analysis techniques

© 2024 Society of Thermal Engineers of Serbia. Published by the Vinča Institute of Nuclear Sciences, National Institute of the Republic of Serbia, Belgrade, Serbia. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution-NonCommercial-NoDerivs 4.0 International licence