Waste to treasure: Reutilization of fluid catalytic cracking coke block as photothermal conversion material for water evaporation--颗粒学报PARTICUOLOGY

Gao, Z., Li, C., He, J., Wang, Z., Qi, X., He, L., . . . Liu, Z. (2024). Waste to treasure: Reutilization of fluid catalytic cracking coke block as photothermal conversion material for water evaporation. Particuology, 88, 62-70. https://doi.org/10.1016/j.partic.2023.09.002

Waste to treasure: Reutilization of fluid catalytic cracking coke block as photothermal conversion material for water evaporation

Zhuwei Gao ^a *, Chengxin Li ^a, Jingjing He ^b, Zhuo Wang ^a, Xinyu Qi ^a, Lan He ^c, Shihao Wang ^a, Zhongxin Liu ^{d e}

a School of Chemical Engineering and Technology, Hainan University, Haikou 570228, China
b TJ-YZ School of Network Science, Haikou University of Economics, Haikou 570203, China
c School of Food Science and Engineering, Hainan University, Haikou 570228, China
d Key Laboratory of Advanced Materials of Tropical Island Resources of Ministry of Education, Hainan University, Haikou 570228, China
e Hainan Provincial Key Laboratory of Fine Chemicals, Hainan University, Haikou 570228, China

10.1016/j.partic.2023.09.002

Volume 88, May 2024, Pages 62-70

Received 19 June 2023, Revised 23 August 2023, Accepted 1 September 2023, Available online 21 September 2023, Version of Record 6 November 2023.

E-mail: gaozhuwei@hainanu.edu.cn

Highlights

• A novel and effective method was provided for the reutilization of FCC coke blocks.

• The membrane preparated by using coke had excellent photothermal conversion ability.

• Formation of the first aromatic hydrocarbon was important for the formation of coke.

Abstract

This study aims to analyze the coking process and propose an effective method for the reutilization of fluid catalytic cracking (FCC) coke block. Herein, we analyzed the basic characteristics and chemical composition of FCC coke blocks. The results showed that the main components were carbon, oxygen, and aluminum, accounting for 60.8%, 26.6%, and 11.5%, respectively. Under the conventional catalytic cracking reaction temperature from 500 °C to 600 °C, the formation of the first aromatic hydrocarbon was particularly important for the formation of coke. The condensation of oil-gas-entrained catalyst particles and their heavy components was the physical cause of coking, while the dehydrogenation condensation reaction of oil-gas heavy components was the chemical factor. In addition, the membrane prepared by powdered coke had excellent photothermal conversion ability, which could be heated to more than 110 °C within 360 s under two fixed light intensities. The evaporation rate of photothermal water was 5.89 kg m² h⁻¹, which has great industrial application potential. These works provide a novel and effective method of separation membrane for the reutilization of FCC coke blocks.

Graphical abstract

Keywords

Coking process; Reutilization of FCC coke; Carbonaceous deposition; Membrane; Photothermal conversion

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