WEBJul 1, 2014 · Rate models for dewatering of the coal tar and the distillation, separation and purifiion of phenols, nitrogen heterocyclic compounds and absorber oil, production of industrial naphthalene and ...
WEBFeb 1, 2023 · To convert the Xinjiang low temperature coal tar (XJCT) into high valueadded chemicals, the coupling process of fast pyrolysis and alytic cracking (FPCC process) is proposed, and the related fundamental data is collected in this research.
WEBMay 1, 2021 · But because that its relative density is higher than and asphaltene content is close to 50% [6] (mass fraction), hightemperature coal tar is not suitable for the production of aerospace fuel. Medium and low temperature coal tar is a liquid product with high condensation degree obtained by pyrolysis of lowrank coal at 600 to 800°C.
WEBFeb 2, 2021 · 1. Introduction. Coal tar derived from coal gasifiion or coal pyrolysis contains abundant high valueadded compounds, which are chemical raw materials. 1,2 China's coal tar production is very considerable. 3 According to the data from the Ministry of Industry and Information Technology of the People's Republic of China, it reached .
WEBDec 9, 2012 · Gasifiion is a thermochemical conversion process used to produce syngas through partial oxidation. ... Benefits of ultrasound in pitch production from coal tar and its mixtures with styrene distillation residue ... where X and Y are the number of atoms of carbon and hydrogen in the model hydrocarbon tar (toluene, benzene or .
WEBOct 1, 2021 · The low tar yield is one of the important factors restricting the industrialization of coal pyrolysis process. In consequence, the effect of O 2 /CH 4 ratio on tar production was understood macroscopically. Fig. 2 illustrates the effect of O 2 /CH 4 ratio on tar and char yields during coal pyrolysis at 650 °C. According to Fig. 2, as the ratio of O 2 /CH .
WEBJul 15, 2023 · Coking chemistry is the subject of relative theories, technologies, processes, and equipment of process where main material coal in the condition of isolating air is researched, and coal is transformed into coke (or semicoke) and raw gas after physicochemical action like thermolysis and coking, and the raw gas is purified and .
WEBJun 1, 2021 · Coal feedstock is mainly lowtemperature coal tar and hightemperature coal tar. Lowtemperature coal tar contains a large amount of phenolic compounds, such components are difficult to be removed in the coking process and might produce a great impact on the structure of carbonization products. On the contrary, the oxygen content of .
WEBApr 27, 2024 · The coal tar processing process provides the chemical industry with valuable products: naphthalene, cresol, xylenols, phenol, technical oils and lubricants. The most significant product of coal tar processing is anthracene, which is a raw material for the production of carbon black. The prospects for the implementation of the coal tar .
WEBSep 1, 2010 · Tar is an unavoidable waste or a byproduct during biomass thermal conversion process (–20% in biomass gasifiion, main product in biomass pyrolysis) or fossil thermal conversion (coal gasifiion, or liquefaction), whose utilization has an important influence on the efficiency of energy resource. Tar as resource and energy is .
WEBMar 21, 2015 · Existing energy resources are struggling to cope with the current energy requirements. It is therefore, necessary to increase energy efficiency and reduce greenhouse gases emissions in integrated steel industries. The yield of coking byproducts is one of the key ways to achieve these goals. This review article is focused on history of .
WEBOct 26, 2021 · Conventional carbon black production occurs by pyrolysis after heavy aromatic feedstock is injected into the postcombustor region of furnace black reactors. The current work examines the conversion of the coal tar distillate in turbulent spray flames to demonstrate a more compact reactor configuration. Coal tar distillates diluted in toluene .
WEBJun 15, 2020 · Naphthalene is the simplest polycyclic aromatic hydrocarbon, and can be used as a precursor to many other complex aromatics. Current industrial processes remove it from coal tar or petroleum during the refining and distillation steps. The process reported here is much greener, albeit on a much smaller scale.
WEBJun 5, 2024 · The naphthalene has a property of insect repellent because of its odour. Naphthalene is an aromatic hydrocarbon that has a formula {C_{10}}{H_8} . Naphthalene may be produced from either coal tar or petroleum. Distillation and fractionation of coal tar is the most common production process. The naphthalene is .
WEBNaphthalene, derived from coal tar, is a volatile white solid substance with a unique odor. Accounting for 10% of coal tar, naphthalene is mainly used in the production of plastics, dyes, concrete additive, and moth repellent. ... CSCC produces refined naphthalene through process of refining naphthalene. As one of the leading tar distillers in ...
WEBDec 9, 2012 · where X and Y are the number of atoms of carbon and hydrogen in the model hydrocarbon tar (toluene, benzene or naphthalene), m and p are the moles of hydrogen and steam per mole of tar and n CO, n CO2, n H2, n CH4, n H2O, n C are the moles of CO, CO 2, H 2, CH 4, H 2 O and solid carbon (soot), respectively, produced by thermal .
WEBThe document summarizes several commercial processes for producing naphthalene: 1. Recovery from coal tar through distillation of the tar acidfree chemical oil in columns to remove light components and produce a 780C naphthalenerich bottoms. 2. Production from petroleum using processes like the Unidak process involving fractionation and .
WEBFeb 20, 2023 · POLLUTION REDUCTION WITH HEAT INTEGRATION IN PRODUCTION PROCESS OF THE PITCH AND NAPHTHALENE FROM COAL TAR 1 2 1 ... and process of coal tar distillation being typical for East European countries ...
WEBMay 1, 2019 · By adding naphthalenebased mesophase pitch (NBMP) into refined coal tar pitch (RCTP), pyrolysis products were obtained by dryblending and cocarbonization method. The properties of pyrolysis products were characterized by polarizing microscope, thermogravimetric analysis (TGA), Fourier transform infrared spectroscopy (FTIR), X .
WEBJan 1, 1980 · Given the same feedstock coal, the tar yield in coking plants with a high carbonization t e m p e r a t u r e is only about Chemicals from tar processing 295 LowTemperature Coal Tar Yield, related to Coal Aliphatic Hydrocarbons Phenols Naphthalene Phenanthrene / Anthracene Pitch 10 % 10 % 25 % 3% 1 35 % % HighTemperature .
WEBJan 14, 2016 · The main feedstock for naphthalene production is coal tar. At an average content of around 10%, naphthalene represents the most important compound in hightemperature coal tar (cokeoven tar) in terms of quantity. It can already be concentrated to over 90% in primary tar distillation, in the naphthalene fraction boiling between 210 and .
WEBProduction. Most naphthalene is derived from coal tar. From the 1960s until the 1990s, significant amounts of naphthalene were also produced from heavy petroleum fractions during petroleum refining, but today petroleumderived naphthalene represents only a minor component of naphthalene production. Naphthalene is the most abundant .
WEBCoaltar pitch is the residue from the distillation of coal tar (Betts, 1997). The largest source of tar and pitch is the pyrolysis or carbonization of coal. Until the end of the Second World War, coal tar was the main source of benzene, toluene, xylenes, phenol, cresols and cresylic acids, pyridine and methylpyridines, naphthalene, anthracene ...
WEBMar 22, 2021 · Abstract In this study, the steam reforming of naphthalene and pyrene as heavy tar model compounds was investigated experimentally in a horizontal tube reactor and theoretically using the CHEMKIN simulation. The experimental results revealed that the reactivity of naphthalene was higher than that of pyrene in the presence of steam. The .
WEBJul 1, 2021 · 1. Introduction. The lowtemperature coal tar is a byproduct in the process of coal pyrolysis under a lower temperature. It is an important organic chemical raw material containing thousands of compounds, in which phenols account for 20%–50% of its mass [1] and have a higher value for the production of synthetic resins, plant protection agents, .
WEBOne valuable compound is naphthalene. The coal tar Received 5 November 2021 evaluation process of its constituent components is carried out by distillation, with a high level of Accepted 6 November 2021 Available online on 7 November 2021 production process of coke and gas from coal.
WEBNaphthalene produced during the distillation of coal tar is crude in nature. Crude Naphthalene is used in the production of tanning agents, disinfectants etc. It undergoes further fractional distillation to produce some downstream products like sulphonated naphthalene (SNF) and Poly Carboxylate Ether (PCE). PCE is used as a ...
WEBJun 2, 2012 · Coal tar is a liquid byproduct of the process of coal gasifiion and carbonation. This liquid oil mixture contains various kinds of useful compounds such as phenol, ocresol, and pcresol.
WEB3 days ago · The majority of naphthalene comes from coal tar. Significant volumes of naphthalene were created from heavy petroleum fractions during petroleum refining from the 1960s through the 1990s, but petroleumderived naphthalene now accounts for just a small portion of naphthalene production. The most prevalent component of coal tar is .
WEBJul 20, 2010 · Based on the generation mechanism, naphthalene is emitted as a product of incomplete combustion,, from wood, straw, tobacco, gasoline and diesel combustion, and from evaporation or sublimation of naphthalenecontaining materials,, coal tar, crude oil, petroleum products, moth repellents and air fresheners.
WEBBased on the egory of source, the coal tar segment emerged as the dominant player in the Indian market for Naphthalene in 2023. Coal tar, a valuable byproduct obtained from the process of coal coking, is abundantly available, making it a highly costeffective and sustainable raw material for naphthalene production.
WEBMar 24, 2017 · The results show that the hydrogenation reaction of phenolic compounds and the hydrogenation reaction of naphthalene in coal tar hydrogenation process are the key factors for the change of coal tar hydrogenation. ... As the reaction pressure increased from 7 to 11 MPa, the production rate of gasoline increased from to %. This ...
WEBDec 1, 2018 · Of particular importance is coal tar. Coal is obtained from the process of coal carbonization, and accounts for 2,5–4 wt.% of the feed coal [3], [4]. It allows on the basis of data of coke production to estimate the global coal tar production at the level of 20 millions Mg per year [5], [6]. Coke production capacity in Poland, allow you to ...
WEBFeb 23, 2024 · Additionally, the distillation process also produces coal tar oils, which are further processed to obtain lighter fractions like light oils and naphthalene. Moreover, the production and use of coal tar come with certain technical considerations. For instance, coal tar is highly flammable and should be handled with caution.
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