Characteristics of coal tar residue treated with microwave-assisted hydrothermal treatment

Xu, Zhiwen; Shao, Huaishuang; Wang, Yungang; Zhao, Qinxin; Liang, Zhiyuan

doi:10.1016/j.fuproc.2020.106580

Cited by 11 publications

(4 citation statements)

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“…Therefore, it may be inferred that part of the tar is probably adsorbed inside the micropores. 23 This porous structure indicates the possible occurrence of pore diffusion during the solid–liquid extraction process of CTR and can support the assumption of CTR as a porous spherical model in this paper.…”

Section: Methodssupporting

confidence: 83%

“…Therefore, it may be inferred that part of the tar is probably adsorbed inside the micropores. 23 The particle size analysis of the extraction residue was performed by using a Malvern Mastersizer 3000 laser particle size meter. As illustrated in Figure 5, particles with sizes below 19.1 μm constitute approximately 10% of the total extraction residue volume, while those in the range of 19.1−44.7 μm account for approximately 15%.…”

Section: Characterization and Analysis Of Ctrmentioning

confidence: 99%

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Simulation and Experimental Study of Solid–Liquid Extraction of Coal Tar Residue Based on Different Extractants

Yang,

Fan,

et al. 2023

ACS Omega

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Coal tar residue (CTR) is recognized as a hazardous industrial waste with a high carbon content and coal tar consisting mainly of toxic polycyclic aromatic hydrocarbons (PAHs). The coal tar in CTR can be deeply processed into high-value-added fuels and chemicals. Effective separation of coal tar and residue in CTR is a high-value-added utilization method for it. In this paper, ethyl acetate, ethanol, and n -hexane were chosen as extractants to study the extraction process of coal tar from CTR, considering the mass transfer in the liquid phase outside the CTR particles and the diffusion inside the CTR particles, and a mathematical model of the solid–liquid extraction process of CTR was established based on Fick’s second law. First, the mass-transfer coefficients ( k f ) and effective diffusion coefficients ( D e ) of ethyl acetate, ethanol, and n -hexane in solid–liquid extraction at 35 °C were determined to be 1.54 × 10 –5 and 4.99 × 10 –10 m 2 ·s –1 , 1.14 × 10 –5 and 3.57 × 10 –10 m 2 ·s –1 , and 1.01 × 10 –5 and 3.48 × 10 –10 m 2 ·s –1 , respectively. Furthermore, the simulated values obtained by the model also maintained a high degree of agreement with the experimental results, which indicates the high accuracy prediction of the model. Finally, the model was used to investigate the effects of the solvent–solid ratio, temperature, and stirring speed on the extraction rates with the three extractants. According to the analysis with gas chromatography–mass spectrometry (GC-MS), among the three solvents, n -hexane extracted the highest content of aliphatic hydrocarbons (ALHs), ethyl acetate extracted the highest content of oxygenated compounds (OCs), and ethanol extracted the highest content of aromatic hydrocarbons (ARHs). The model and experimental data can be used to provide accurate predictions for industrial utilization of CTR.

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Section: Methodssupporting

confidence: 83%

Section: Characterization and Analysis Of Ctrmentioning

confidence: 99%

Simulation and Experimental Study of Solid–Liquid Extraction of Coal Tar Residue Based on Different Extractants

Yang,

Fan,

et al. 2023

ACS Omega

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“…The combustibility index S is used as a criterion for fuel combustion characteristics. A bigger S indicates a better combustion characteristic, and S is defined as follows 26 where DTG max denotes the maximum mass loss rate (%/min), DTG mean is the average mass loss rate (%/min), T i is the ignition temperature (K), and T b is the burnout temperature (K).…”

Section: Resultsmentioning

confidence: 99%

“…The combustibility index S is used as a criterion for fuel combustion characteristics. A bigger S indicates a better combustion characteristic, and S is defined as follows 26…”

Section: Resultsmentioning

confidence: 99%

Research on Thermal Behaviors and NO_x Release Properties during Combustion of Sewage Sludge, Sawdust, and Their Blends

et al. 2022

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To investigate the thermal behaviors and NO x emission properties during combustion of sewage sludge (SS), sawdust (SD), and their blends (SS5SD5, SS3SD7, and SS1SD9 with SD proportions of 50, 70, and 90 wt %, respectively), tests were conducted using thermogravimetry–mass spectrometry (TG-MS), Fourier transform infrared spectroscopy (FTIR), and a tube furnace in this study. Results indicated that hydrogen in the fuel was mainly released during volatile combustion, and carbon conversion proceeded during the whole combustion process. With the SD proportion increasing, samples exhibited better combustion characteristics. Compared to SD, SS emitted more NO x due to its higher nitrogen content but showed lower conversion ratios from fuel nitrogen to NO x , and the NO x yields decreased significantly with the increase in SD proportion. NO x emissions of higher volatile samples were more sensitive to temperature, and NO x yields of SD and SS1SD9 continued to decrease from 800 to 1000 °C, whereas NO x yields of SS, SS5SD5, and SS3SD7 changed slightly from 800 to 900 °C and decreased significantly from 900 to 1000 °C. Synergistic effects of cocombustion on NO x emission varied with the blending ratio and temperature. SS5SD5 and SS3SD7 always presented a positive NO x reduction performance, and SS1SD9 exhibited opposite NO x reduction effects at different temperatures. Synthetically considering the SS disposal capacity, combustion characteristic, and NO x yield, an SS proportion of around 30% in blends is more recommended in practical applications.

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Mass transfer research on solid-liquid separation of extracted coal tar residue based on diffusion model

Jing,

Du,

Shang

et al. 2024

Chemical Engineering Research and Design

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Characteristics of coal tar residue treated with microwave-assisted hydrothermal treatment

Cited by 11 publications

References 11 publications

Simulation and Experimental Study of Solid–Liquid Extraction of Coal Tar Residue Based on Different Extractants

Simulation and Experimental Study of Solid–Liquid Extraction of Coal Tar Residue Based on Different Extractants

Research on Thermal Behaviors and NO_x Release Properties during Combustion of Sewage Sludge, Sawdust, and Their Blends

Mass transfer research on solid-liquid separation of extracted coal tar residue based on diffusion model

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Characteristics of coal tar residue treated with microwave-assisted hydrothermal treatment

Cited by 11 publications

References 11 publications

Simulation and Experimental Study of Solid–Liquid Extraction of Coal Tar Residue Based on Different Extractants

Simulation and Experimental Study of Solid–Liquid Extraction of Coal Tar Residue Based on Different Extractants

Research on Thermal Behaviors and NOx Release Properties during Combustion of Sewage Sludge, Sawdust, and Their Blends

Mass transfer research on solid-liquid separation of extracted coal tar residue based on diffusion model

Contact Info

Product

Resources

About

Research on Thermal Behaviors and NO_x Release Properties during Combustion of Sewage Sludge, Sawdust, and Their Blends