Transformation of organic sulfur and its functional groups in nantong and laigang coal under microwave irradiation

Wu, Yue; Zhang, Shengfu; Cai, Shengguan; Xiao, Xiong; Yin, Cheng; Xu, Jian; Qiu, Shuxing; Yu, Wenzhou; Hu, Meilong; Li, Wen

doi:10.1002/jcc.26051

Cited by 16 publications

(11 citation statements)

References 36 publications

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“…11 The microwave irradiation experiment of Nantong coal (NTC) and Laigang coal (LGC) has been carried out in a microwave oven, and the transformation of organic sulfur and its functional groups was investigated via a compact sulfur tester and Fourier-transform infrared spectra. 12 Although the modeling of the desulfurization of coal has been analyzed, the main goal of this study was to avoid high nonlinearity of the mathematical approaches by using soft computing methodology. Soft computing methods do not require knowledge of the internal system, and these methods can provide a compact solution for multivariable problems.…”

Section: Introductionmentioning

confidence: 99%

Retracted: Impactful factors for inorganic sulfur reduction of coal by adaptive neurofuzzy technique

Aleksic¹,

Statkic²,

Grbic³

et al. 2020

Structural Concrete

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The main aim of this study was to analyze the impact of six parameters on the organic and inorganic sulfur reduction of coal using a mixed culture consisting of ferrooxidans species extracted from coal washery tailings and from pyritic sulfur and Rhodococcus species extracted from oily soils for organic sulfur removal. An adaptive neurofuzzy inference system (ANFIS) was used to determine the influence of particle size, pulp density, initial pH, shaking rate, leaching time, and temperature on the microbial desulfurization of coal. This process is known as variable selection procedure or wrapper methodology, where the parameters' influence is determined by prediction errors. Results show that the initial pH has the strongest relevance for the microbial desulfurization of coal.

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Section: Introductionmentioning

confidence: 99%

Retracted: Impactful factors for inorganic sulfur reduction of coal by adaptive neurofuzzy technique

Aleksic¹,

Statkic²,

Grbic³

et al. 2020

Structural Concrete

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show abstract

“…The researchers desulfurized under microwave irradiation. After treatment, most of the FeS 2 had been transferred, while -SH and S-S needed more time to rupture than S=O when the microwave power was 1000 W (Wu et al, 2019). Gürü oxidized pulverized coal through nitric acid solution, and the conversion rate was only 38.7% (Gürü et al, 2007).…”

Section: Comparison Of the Resultsmentioning

confidence: 99%

Evaluation of Microwave-Assisted Organic Acid Separation of Organic Sulfur from High Sulfur Coal

Jiang

Jin

Shen

et al. 2021

Preprint

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To explore the feasibility of organic acid removal of organic sulfur from high sulfur coal, three organic acids, oxalic acid, citric acid and ascorbic acid, were selected as desulfurization reagents. Combined with microwave irradiation technology, desulfurization experiments of high-sulfur coal treated with nitric acid were conducted. The orthogonal experimental results showed that microwave synergistic citric acid desulfurization had a better desulfurization effect. The removal rate of organic sulfur was 55.47% when the operation conditions of the reaction were 1 mol/L, 90 ℃ and 1000 W for 7 min. The desulfurization efficiency of oxalic acid and ascorbic acid was not good, and the removal efficiencies of organic sulfur were 32.35% and 21.37%, respectively. Fourier transform infrared spectroscopy showed that sulfones and sulfoxides were partially reduced and that the removal effect of thiophene was poor. X-ray photoelectron spectroscopy showed that the mercapto group in the mercaptan combined with hydrogen ions and escaped in the form of H2S. The content of aromatic thioether and aromatic thiol in the coal treated with microwave irradiation was only 0.1%. Research indicates that microwave-assisted organic acid removal of organic sulfur is feasible, and researchers can explore more efficient organic acids as desulfurization reagents based on this study.

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“…In accordance with the literature review, 34 under the condition of microwave and auxiliary agent, the sulfur-containing structure is gradually oxidized, and the strength of the C S bond decreases and breaks. 35,36 The reaction mechanism of sulfur structure removal from coal is shown in Figure 7. The C S bond in benzenethiol is broken, and SO 2 and H 2 S are formed to escape, as shown in Figure 7a.…”

Section: Analysis Of the Mechanism Of Microwave Synergistic Auxiliary...mentioning

confidence: 99%

Effect of chemical desulfurization on coal properties and sulfur structure based on microwave technology

Zhou

Tao

Luo

et al. 2022

Asia-Pacific J Chem Eng

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Under the two frequency microwave conditions of 915 and 2450 MHz, orthogonal tests were designed to investigate the effects of organic acid reagent, microwave irradiation time, and mixing time of additives and coal samples on the desulfurization effect of coal. Results show that the effect of irradiation time on the experimental desulfurization efficiency under frequency microwave conditions is large and is the main factor. The desulfurization effect under 915 MHz microwave condition is better than 2450 MHz microwave condition. Two sets of experimental optimal coal samples were used for characterization and analysis. Thermogravimetric analysis revealed that the combustion temperature range of the coal samples is shortened and the integrated combustion index is considerably higher after the microwave irradiation experiment. Fourier‐transform infrared spectroscopy analysis showed that the overall chemical structure of the coal samples does not change significantly after the experimental treatment. X‐ray photoelectron spectroscopy analysis showed that the intensity of organic sulfur in coal samples is weakened after microwave irradiation, the characteristic peaks of thiols and thioethers are reduced to a great extent, and an increase in the intensity of sulfoxide organic sulfur is observed. On the basis of the results of experimental analysis and quantum chemical simulation calculations, the mechanism of organosulfur structure removal under the action of microwave is revealed.

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Transformation of organic sulfur and its functional groups in nantong and laigang coal under microwave irradiation

Cited by 16 publications

References 36 publications

Retracted: Impactful factors for inorganic sulfur reduction of coal by adaptive neurofuzzy technique

Retracted: Impactful factors for inorganic sulfur reduction of coal by adaptive neurofuzzy technique

Evaluation of Microwave-Assisted Organic Acid Separation of Organic Sulfur from High Sulfur Coal

Effect of chemical desulfurization on coal properties and sulfur structure based on microwave technology

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