利用热分析技术对烟头过滤嘴废弃物热解过程进行热化学转化

IF 1.1 4区工程技术 Q4 THERMODYNAMICS

Thermal Science Pub Date : 2023-01-01 DOI:10.2298/tsci230520153b

Bojana Božilović, B. Janković, Milena Pijovic-Radovanovic, H. Waisi, M. Marinović‐Cincović, S. Krstić, V. Dodevski

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引用次数: 0

摘要

采用不同热分析技术(TG-DTG-DTA和DSC同步方法)研究了在惰性气氛中不同升温速率下烟头滤嘴(CBFs)废料的热化学转化。从化学结构和实验参数对转化过程的影响角度，讨论了废料的热物理性质和热物理性质。确定了增塑剂(三乙酸酯，TAC)的乙酰基通过偶极相互作用和氢键与醋酸纤维素(CAc)相互作用。这些极性相互作用的影响可以影响CBF的玻璃化转变温度(Tg)的位置。根据DSC分析的Tg估计值，发现CBF中存在的CAc的取代度(DS)为2.8 (DS = 2.8)，其中证实了三乙酸纤维素(CTA)的存在。假设DS的增加会导致结晶度的下降。结晶度的下降导致羟基的减少，导致链的组织减少，从而减少分子间通过氢键的相互作用。通过对被测材料热物理特性的检测，发现在热解过程中，材料的热容和热惯性(TI)均随温度的升高而线性增加。由此得出结论，在此过程中产生的生物炭类型将具有较大的储热能力，这可能取决于形成的颗粒尺寸，直径和孔隙率。进一步推断，热导率(?)的下降幅度取决于材料的纤颤。

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Thermo-chemical conversion of cigarette butt filters waste through pyrolysis process using thermal analysis techniques

Thermo-chemical conversion of cigarette butt filters (CBFs) 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 thermophysical 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, TAC) interact with cellulose acetate (CAc) 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 CAc present in CBF has degree of substitution (DS) equals to 2.8 (DS = 2.8), where the presence of cellulose triacetate (CTA) was confirmed. It was assumed that an increase of DS 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 (TI) 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 (?) after Tg depends on the material fibrillation.

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来源期刊

Thermal Science 工程技术-热力学

CiteScore

2.70

自引率

29.40%

发文量

399

审稿时长

5 months

期刊介绍： The main aims of Thermal Science to publish papers giving results of the fundamental and applied research in different, but closely connected fields: fluid mechanics (mainly turbulent flows), heat transfer, mass transfer, combustion and chemical processes in single, and specifically in multi-phase and multi-component flows in high-temperature chemically reacting flows processes present in thermal engineering, energy generating or consuming equipment, process and chemical engineering equipment and devices, ecological engineering, The important characteristic of the journal is the orientation to the fundamental results of the investigations of different physical and chemical processes, always jointly present in real conditions, and their mutual influence. To publish papers written by experts from different fields: mechanical engineering, chemical engineering, fluid dynamics, thermodynamics and related fields. To inform international scientific community about the recent, and most prominent fundamental results achieved in the South-East European region, and particularly in Serbia, and - vice versa - to inform the scientific community from South-East European Region about recent fundamental and applied scientific achievements in developed countries, serving as a basis for technology development. To achieve international standards of the published papers, by the engagement of experts from different countries in the International Advisory board.