Sulfur removal was highest at low solvent density and high temperature, ranging, for 15 min reaction time, from 34 to 53% on a feed-to-product basis, or up to 66% if loss of coal is allowed for. Initial results obtained with a semicontinuous reactor are briefly summarized, as well as recent work on oil agglomeration at low oil levels followed ...
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Unlike inorganic sulfur, only part of organic sulfur could be removed by oxidation. Baruah et al. [28] removed sulfur from high sulfur coal in a H 2 O 2 and HCOOH mixed system, whereby the inorganic sulfur was removed completely, however, the organic sulfur removal rate was merely 33 %. Demirbas [29] used prussian blue to …
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Organic sulfur is found in coal as mercaptans (RSH), disulfides (RS-S-R'), sulfides (R-S-R'), and thiophenes (heterocyclic). Organic sulfur is thus integrated into the carbon structure and difficult to remove. Oxidative ions convert organic sulfur to sulfates which can be dissolved in water or form sulfur dioxide. RSH þ H 2O ! ROH þ H ...
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The chemistry of sulfur is so complex that it greatly complicates the removal of sulfur from coal. Sulfur is found in two forms in coal: (1) inorganic sulfur, and (2) organic sulfur [4]. Sulphate-sulfur occurs in combination with either Ca or Fe. Pyritic-sulfur refers to iron disulfide (FeS 2) as pyrite, marcasite and melnikovite-pyrite ...
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Coal beneficiation is one of the most effective methods for removing minerals (such as gangues and pyrite) and pollutants (such as sulfur) before the burning of coal. ... Based on microbial cultures (such as Thiobacillus ferrooxidans), up to 90% of inorganic sulfur can be removed while the removal of organic sulfur is difficult to …
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This article covered the development of chemical desulfurization technologies for organic sulfur coal, including acid and alkaline leaching, peroxyacetic …
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Coal beneficiation and organic sulfur removal. 1996, Fuel. Show abstract. Organic sulfur removal from coal with supercritical methanol as solvent, combining extraction and reaction, was studied. Experiments were carried out in a 300 ml batch reactor with Illinois coal at a coal/methanol weight ratio of 1:1, 400–450°C and various …
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Organic sulfur removal from coal with supercritical methanol as solvent, combining extraction and reaction, was studied. Experiments were carried out in a 300 ml batch …
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Request PDF | Organic sulfur and hap removal from coal using hydrothermal treatment | Coal is still the major source of power for electrical generation worldwide and will continue to be in the ...
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The important factors restricting the removal of organic sulfur from coal lies into the (1) absence of suitable analytical techniques for the measurement of organic sulfur content in coal and (2) sparse information pertaining to biological mechanism of organic sulfur removal (ElSawy and Gray, 1991). The mechanisms of sulfur removal …
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Coalification refers to the series of processes involved during the transformation of this organic vegetation into coal. The first step in transforming vegetation into coal is the formation of peat upon decay and decomposition of the dead plants through biological processes. ... Coal beneficiation using spirals is an age-old technique and is ...
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Coal beneficiation. After mining, coal is washed to remove impurities including ash and to increase its heating value. Preparation plants remove rock, sulfur, and other particulates from the run-of-mine coal. These plants also allow mining companies to sort coal based on quality, enhancing their ability to serve customers' various …
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Demineralization and desulfurization of high-sulfur coal from Assam (Makum coalfield), India, was investigated using aqueous solutions of sodium hydroxide, potassium hydroxide, and their mixtures (1:1) alone as well as followed by mild hydrochloric acid treatment. Compared to the alkali and acid alone, successive treatments with the …
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Suitable for beneficiation of coal fines and removal of magnetic particles from coal ash. ... [101] described that the organic coal molecules are held into the micropores by a network of electron donor and acceptor (ED/A) interactions. To extract the coal molecules from pores, the ED/A complexes between the molecule and network …
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The emission of sulfur compounds during the combustion of coal is the main cause of atmospheric pollution and poses a threat to human health and the ecosystem. Thus, elimination of sulfur compounds from coal before its use is compulsory, and hence, coal desulfurization has become the key solution. In the present study, …
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The desulfurization method for Illinois No. 6 coal was capable of reducing significant amounts of organic sulfur. The removal of organic sulfur achieved a 37.8% reduction at the optimum operation ...
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1. Introduction. The organic sulfur in low rank coal is difficult to remove. However the sulfur has harmful effects on coal utilization, such as burning and coke making (Pohlmann et al., 2016, Dolhyi et al., 2000).Generally, sulfur removal during coal combustion is effective but it needs more economic investment (Cheng et al., 2003).In …
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SULFUR REMOVAL FROM COAL BENEFICIATION ... which represents at least half of the total sulfur content in coal. Organic sulfur is more ... achieving 90% removal of both inorganic and organic sulfur ...
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The U.S. Department of Energy's Office of Scientific and Technical Information
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Demirbas [29] used prussian blue to remove sulfur in coal. Results showed that temperature and stirring time were dominant parameters which can affect the organic sulfur removal performance. In this study, the removal rate of organic sulfur reached up to more than 25 %. Rodriguez et al. [30] used O 2 /O 3 mixed gas to oxidize pyrite in an ...
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In order to improve the total sulfur removal rate in coal combustion, an acidic ionic liquid (IL) 1-carboxymethyl-3-methylimidazolium hydrogen sulfate ([HOOCCH2mim][HSO4]) as the extractant combined with the oxidant 30% hydrogen peroxide (H2O2) was applied to reduce the total sulfur content, and its microscopic mechanism of desulfurization was …
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DOI: 10.1016/S0378-3820(01)00201-6 Corpus ID: 98347423; Organic sulfur and hap removal from coal using hydrothermal treatment @article{Timpe2001OrganicSA, title={Organic sulfur and hap removal from coal using hydrothermal treatment}, author={Ronald C. Timpe and Michael D. Mann and John H. Pavlish and Peter K. K. …
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Coal with low ash content, high sulfur content, and high organic sulfur Responsible editor: Philippe Garrigues * Baisheng Nie bshnie@163 content is generally referred to as low-quality coal ...
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leaching, mineral beneficiation and coal desulfurization. The iron-sulfur oxidizing microorganisms are widely studied ... to evaluate the organic sulfur removal efficacy of the A. fer-
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DOI: 10.1016/j.fuel.2020.118124 Corpus ID: 219503603; Effect of pre-desulfurization process on the sulfur forms and their transformations during pyrolysis of Yanzhou high sulfur coal
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Further, Se is consistently associated with organic matters (57.1%) and silicates (24.5%) in the raw coal (Fig. 4). After coal beneficiation, the fractionation profile of Se speciation for the middlings and coal slime is similar to that of the raw coal where the organic-bound Se is dominant; whereas the coal gangue contains the lowest organic ...
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This paper aims to provide a compilation of studies on adsorptive removal of H 2 S and organic sulfur compounds from natural gas at relatively low temperatures and pressures. The manuscript compares sulfur uptakes among different materials, including zeolites, activated carbons, metallic organic frameworks (MOFs), and metal oxides, and …
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The acceptable process should not only remove inorganic sulfur but also remove organic sulfur. Otherwise, it is not commercially viable. In biodesulfurization, microorganisms attack especially pyritic sulfur although some microbes attack organic sulfur in coal matrix (Kilbane et al. 2002). Even if they affect both, the effect rates vary ...
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Organic sulfur removal from coal with supercritical methanol as solvent, combining extraction and reaction, was studied. Experiments were carried out in a 300 …
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The results show that H 2 O 2 can remove most of the inorganic sulfur and a small part of organic sulfur from bituminous coal. The pure [HOOCCH 2 mim][HSO 4 ] could remove …
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Bozdemir et al. found that Rhodococcus erythropolis ATCC 53968 was the most effective microorganism to remove both organic sulfur and inorganic sulfur from …
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The beneficiation of coal, both physical and chemical, has been included to improve the coal quality in order to reduce these emissions. ... Heterogeneous nature of organic matter in pulverized coal sample ... Coal upgrading: Increase clean coal technologies such as dewatering, demineralization, and removal of sulfur from coal …
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Coal beneficiation and organic sulfur removal. Anti Perkson. 1996, Fuel. See Full PDF Download PDF. See Full PDF Download PDF. Related Papers. Energy & Fuels ...
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Chemical beneficiation of raw coal is considered as the most promising method to effectively remove all sulfur forms. Acids and alkaline solutions can be used …
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This work explores the use of carbon dioxide, water, and their mixtures as solvent for the precombustion beneficiation of raw coal without using any toxic mineral acids in the temperature range of ...
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A novel experiment was carried out for the removal of organic sulphur by the electron transfer process. In these experiments, the effect of conventional and microwave …
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Investigation on desulfurization of coal samples from Boragolai and Ledo collieries of Makum coal field, Assam, India using alkali treatment leads to over 70 % removal of inorganic sulfur, and ...
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Extractions with supercritical fluids have several benefits including enhanced mass transport, ease of separation and recycle, wide range of extractive capability and tunability, better...
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