Non-thermal effect of microwave on organic sulfur removal from coal by microwave with peroxyacetic acid

Tang, Longfei; Chen, Xueli; Tao, Xiuxiang

doi:10.1016/j.fuel.2022.127262

Cited by 11 publications

(3 citation statements)

References 62 publications

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“…To reduce the amount of sulfur before thermal processing of coal, various methods of sulfur removal are used: magnetic separation, gravitational separation, leaching, etc. [14][15]. Also, to improve the environmental characteristics of flue gases it is necessary to reduce the amount of exhausted carbon dioxide [16].…”

Section: Introductionmentioning

confidence: 99%

Thermal decomposition of sulfur brown coal

Tsvetkova,

Kislov,

Zaichenko

et al. 2024

E3S Web Conf.

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Section: Introductionmentioning

confidence: 99%

Thermal decomposition of sulfur brown coal

Tsvetkova,

Kislov,

Zaichenko

et al. 2024

E3S Web Conf.

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“…3 Microwaves have the characteristics of selectivity, penetration, and bulk heating, which can promote chemical reactions, accelerate the reaction rate, and increase the yield. [4][5][6][7] By taking advantage of the difference in microwave absorption capacity between coal matrix and organic sulfur compounds, the organic sulfur compounds in coal can generate local high temperature and dissociate reaction through microwave radiation within a very short time before the coal matrix is decomposed. 8,9 The response of the medium to microwave depends on its own dielectric characteristics.…”

Section: Introductionmentioning

confidence: 99%

“…Organic sulfur in coal is generally embedded in organic matter and is difficult to remove; its main forms include mercaptan, sulfide, thiophene, sulfone, and sulfoxide 3 . Microwaves have the characteristics of selectivity, penetration, and bulk heating, which can promote chemical reactions, accelerate the reaction rate, and increase the yield 4–7 . By taking advantage of the difference in microwave absorption capacity between coal matrix and organic sulfur compounds, the organic sulfur compounds in coal can generate local high temperature and dissociate reaction through microwave radiation within a very short time before the coal matrix is decomposed 8,9 .…”

Section: Introductionmentioning

confidence: 99%

Microwave absorption properties and quantum chemistry of organic sulfur compounds in coal

Tao

Wang

et al. 2023

Asia-Pacific J Chem Eng

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The microwave absorption properties of dielectrics determine the promotion degree of microwave energy to chemical reaction. The wave‐absorbing characteristics of organic sulfur compounds in high‐sulfur coking coal need to be studied to improve the efficiency of microwave desulfurization of coal. In this study, the imaginary part of complex dielectric constants (ε′′) and dielectric loss tangent (tan σ) of benzene mercaptan, difurfuryl disulfide, and benzothiophene were characterized. The dipole moment, molecular configuration, and frontier molecular orbital energy of organic sulfur compounds were simulated and calculated under the different external energy fields. The migration law of mercaptan, sulfide, and thiophene in coal in microwave field were analyzed. The results show that the ε'′ and tan σ of benzothiophene slightly changed with the change in microwave frequency in the frequency range of 500–2500 MHz, and the microwave absorption properties are weaker than those of benzene mercaptan and difurfuryl disulfide. Therefore, difurfuryl disulfide and benzene mercaptan molecules are more active in the microwave field than benzothiophene. The sulfur components in benzene mercaptan and difurfuryl disulfide can dissociate in the form of small inorganic sulfur molecules of carbon sulfides and disulfides, respectively. After microwave irradiation, the relative content of mercaptan and thioether in coal was decreased, whereas the relative content of thiophene remained almost unchanged.

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