Synergistic effects and kinetics analysis for co-pyrolysis of vacuum residue and plastics

doi:10.1007/s11705-024-2414-4

Front. Chem. Sci. Eng.

2024, Vol. 18

Issue (5) : 55 https://doi.org/10.1007/s11705-024-2414-4

Synergistic effects and kinetics analysis for co-pyrolysis of vacuum residue and plastics

Chao Wang¹, Xiaogang Shi¹(

), Aijun Duan¹, Xingying Lan¹, Jinsen Gao¹, Qingang Xiong²(

)

¹. State Key Laboratory of Heavy Oil Processing, China University of Petroleum-Beijing, Beijing 102249, China
². State Key Laboratory of Pulp and Paper Engineering, South China University of Technology, Guangzhou 510640, China

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Abstract

This study utilized a thermogravimetric analyzer to assess the thermal decomposition behaviors and kinetics properties of vacuum residue (VR) and low-density polyethylene (LDPE) polymers. The kinetic parameters were calculated using the Friedman technique. To demonstrate the interactive effects between LDPE and VR during the co-pyrolysis process, the disparity in mass loss and mass loss rate between the experimental and calculated values was computed. The co-pyrolysis curves obtained through estimation and experimentation exhibited significant deviations, which were influenced by temperature and mixing ratio. A negative synergistic interaction was observed between LDPE and VR, although this inhibitory effect could be mitigated or eliminated by reducing the LDPE ratio in the mixture and increasing the co-pyrolysis temperature. The co-pyrolysis process resulted in a reduction in carbon residue, which could be attributed to the interaction between LDPE and the heavy fractions, particularly resin and asphaltene, present in VR. These findings align with the pyrolysis behaviors exhibited by the four VR fractions. Furthermore, it was observed that the co-pyrolysis process exhibited lower activation energy as the VR ratio increased, indicating a continuous enhancement in the reactivity of the mixed samples during co-pyrolysis.

Keywords co-pyrolysis heavy residual oil polyethylene thermogravimetric analysis synergistic effects

Corresponding Author(s): Xiaogang Shi,Qingang Xiong

About author:

Li Liu and Yanqing Liu contributed equally to this work.

Just Accepted Date: 19 January 2024 Issue Date: 23 April 2024

Cite this article:

Chao Wang,Xiaogang Shi,Aijun Duan, et al. Synergistic effects and kinetics analysis for co-pyrolysis of vacuum residue and plastics[J]. Front. Chem. Sci. Eng., 2024, 18(5): 55.

URL:

https://academic.hep.com.cn/fcse/EN/10.1007/s11705-024-2414-4
https://academic.hep.com.cn/fcse/EN/Y2024/V18/I5/55

Tab.1 Basic properties of VR

Fig.1 TG and DTG curves of LDPE, VR, and their mixture samples at 10 °C?min^–1.

Tab.2 Thermal decomposition characteristics for the pyrolysis of LDPE, VR and their blends

Fig.2 (a–c) Experimental and calculated TG-DTG curves of mixed samples at 10°C·min^–1; (d) weight deviation value of mixture samples.

Fig.3 Comparison of the co-pyrolysis carbon residue with individual components.

Tab.3 Thermal decomposition characteristics for the pyrolysis of SARA in VR and their mixture with LDPE (1:1)

Fig.4 TG-DTG curves of SARA fractions at 10 °C·min^–1.

Fig.5 Comparison between experimental and calculated TG-DTG curves of SARA fractions mixed LDPE (1:1) at 10 °C·min^–1.

Fig.6 Weight deviation value of mixture samples of SARA fractions with LDPE in 1:1.

Tab.4 The kinetic parameters of LDPE, VR, and LDPE-VR mixed samples obtained by the Friedman method

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