WEBFeb 15, 2024 · Tarrich coal, abundant in northwestern China, undergoes variations in the coalforming environment, resulting in diverse occurrences of tarrich coal and its molecular structures across regions and layers. The pyrolysis process of these coals also differs accordingly. This study investigated four coal samples with different tar yields and ...
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WEBCall +1 800 752 8878. Published December 1976. This report concerns the recovery and purifiion or refining of byproduct chemicals from high temperature carbonization of coal. Process designs and cost estimates are given for coal tar fractionation, refining of light oil to produce BTX aromatics (benzene, toluene, and xylenes), refining of ...
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WEBNaphthalene was first isolated from coal tar in 1819 by Alexander Garden; it represents about 10% of this complex mixture of aromatics. The industrial importance of naphthalene dates from the latter half of the last century, owing mainly to the ease with which it can be converted into sulfonic acids and thence also to the naphthols, for use as dyestuffs .
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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 .
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WEBFeb 1, 2008 · Naphthalene compounds derived from coal tar can be used in the production of synthetic pharmaceutical compounds [12,13] and synthetic chemicals as methylnaphthalenes, dimethylnaphthalenes [8,9,[14 ...
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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.
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WEBSep 1, 2023 · Table 1 lists the general properties of the raw material coal tar pitch (CTP) provided by China Steel Chemical Co. It is noteworthy that the QI content of CTP reaches %, which is significantly higher than that of the coal tar pitch commonly used for mesophase pitch preparation [26].Since the QI is mainly composed of thermally .
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WEBAug 15, 2003 · The industrial production of naphthalene is predominantly based on crystallisation and distillation of coal tar, which is condensed and separated from coke oven gases. Those fractions containing the naphthalene oil are further processed to produce naphthalene of different purities depending on its final use.
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WEBSep 17, 2023 · article{Guo2023ConceptualDA, title={Conceptual Design and Development of an EnvironmentFriendly Process for Simultaneous Extraction of Phenol and Naphthalene Compounds from Tar}, author={Jingtao Guo and Chao Pan and Bingxiao Feng and Xiaomin Qiu and Quanhong Zhu and Hongbing Song and Hengjun Gai and .
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WEBSep 20, 2021 · Except for the main product, coke, many byproducts, such as coke oven gas and tar, supervene in the coking process. Besides, the coal tar concomitants are produced in the mediumtemperature pyrolysis process for semicoke production and the lowtemperature pyrolysis process for the production of oil products, respectively, .
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WEBThis report proffers the detailed cost evaluation of the production of naphthalene from coal tar. In this process, the coal tar is subjected to the distillation and fractionation process. Further, the middle fractions, which contain most of the naphthalene, are cooled and crystalized to yield crude naphthalene. Lastly, the crude naphthalene is ...
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WEBMay 8, 2019 · Abstract The results of studies on the hydrogenation of a naphthalene fraction of coal tar performed to obtain highgrade sulfurfree naphthalene and highpurity benzene for organic syntheses and to increase the yield of naphthalene due to hydrodemethylation of its homologues from the feedstock are presented. It was .
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WEBHowever, declining anthracene production has led to a supply shortage, promoting the naphthalene process. Naphthalene is readily available in coal tar and can also be extracted from residual oils obtained from gasoline reforming. 3. Naphthalene Process. This process is employed in Japan by Kawasaki and in Europe by Bayer.
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WEBDynamic optimal control of coal tar chemical looping gasifiion based on process modelling and intelligent screening. Journal of Cleaner Production (IF ) Pub Date: , DOI: ... Utilisation of coal tar naphthalene oil fractions for the synthesis of valueadded chemicals: alternative paths to mono and dimethylnaphthalenes ...
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WEBJul 1, 2021 · The soot produced in the process of coal pyrolysis seriously affect the atmosphere environment and health of human beings. This study used naphthalenethe most abundant precursor species in coal ...
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WEBJul 2, 2021 · From its founding, the Eastern Research Institute of Coal Chemistry (AO VUKhIN) has studied not only coal and metallurgicalcoke production but also coking byproducts such as coal tar and raw benzene. The first research in this area, directed by Postovskii (appointed to the Soviet Academy of Sciences in 1970), focused on .
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WEBOct 13, 2022 · The results may be used in developing technology for deriving coal tar as a single fraction of specified composition and also for the production of individual compounds that are promising for ...
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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 ...
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WEBNaphthalene is the most simple, commonly found, and most watersoluble PAHs in the environment. It is produced from coal tar fraction by crystallization and distillation. It is often used as dispersants in natural and synthetic rubbers, in the production of naphthalene sulfonate superplasticizers for concrete, in paints, tanning agents in the .
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WEBAug 17, 2016 · Coal tar, as a byproduct, is obtained mainly from the process of coal pyrolysis and accounts for – % of the feed coal, this means that the worldwide yield is related to the amount of coke [2, 4], and if those can be used to produce clean liquid fuel, a considerable amount of potential energy will be obtained. Hence, a highly efficient ...
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WEBDownload scientific diagram | Percentages of BTX, PCX and Naphthalene in coal tar collected under different atmospheres from publiion: Enhanced nearzeroCO2emission chemicalsoriented oil ...
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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, .
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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 .
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WEBIn the oxidation process, coal tar naphthalene and/or oxylene is vaporized, mixed with air and fed to the reactors. ... SUMMARY OF NAPHTHALENE EMISSIONS FROM ALL SOURCES Emission Source Coke byproduct recovery Naphthalene production Coal tar Petroleum Naphthalene end uses Inadvertent sources* Total All Sources Source .
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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 .
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WEBBhilai Cement is India's largest Coal Tar Manufacturers in India and globally. We Manufacturing Exporting Coal tar byproducts include Coal Tar Pitch, Creosote Oil, Naphthalene, Gilsonite, and Furnace Oil, etc at affordable ranges. Between 2022 and 2027, the Coal Tar market is expected to grow at a CAGR of %.
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WEBFeb 15, 2007 · The morphologies of crystals were compared in both solution and melt crystallizations. The solution crystallization using methanol proved to be the better technology to separate naphthalene from naphthalenerich oil. The purity of the crystals has been upgraded over wt% by a solution crystallization.
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WEBOct 1, 2022 · Naphthalene is an important component of high temperature coal tar and its content can reach more than 10%. Catalytic polycondensation of naphthalene is an effective way to prepare mesophase pitch and functional carbon materials. ... which may provide valuable hints for exploring the production process of mesophase .
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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.
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