COAL TAR PITCH-PAST, PRESENT, AND FUTURE
Coal tar pitch is produced from coal tar by a distillation process. In North America and Europe the majority of the anode binder pitch is produced by vacuum flash distillation. …
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Coal tar pitch is produced from coal tar by a distillation process. In North America and Europe the majority of the anode binder pitch is produced by vacuum flash distillation. …
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under strong nitrogen flow, and further vacuum distillation to obtain a high softening ... coal tar exhibited a molecular weight distribution in the range of 100–500, 200–800, and 150–700 ...
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The samples of dry distillation pine tar and coal tar were investigated by TG-DTG-DSC, and the combustion characteristics and combustion kinetics of the samples were studied. The results show that there exist two significant mass loss peak and endothermic peak in the combustion of dry distillation coal tar and pine tar, which, …
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Seven fractions were isolated from heavy coal tar in low-temperature coal tar from Northern Shaanxi by vacuum distillation (1 kPa) at <100℃, 100-170℃, 170-200℃, 200-240℃, 240-270℃, 270 ...
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The separation of low-temperature coal tar (LTCT) containing solid particles by vacuum distillation is essential in various applications, such as in-situ pyrolysis. However, the …
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(distillation residue) accounted for about half mass of the total MLCT, which belongs to coal tar pitch (mainly composed of polycyclic aromatic hydrocarbons), and was the main component of the ...
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Downloadable (with restrictions)! The separation of low-temperature coal tar (LTCT) containing solid particles by vacuum distillation is essential in various applications, such as in-situ pyrolysis. However, the separation characteristics of solid-containing LTCT using vacuum distillation have yet to be fully understood. Therefore, explorations were …
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During distillation of coal tar almost 100 % of the QI in the tar is incorporated into the coal tar pitch product. Over the years the importance or lack of importance of Ql on the quality of coal tar pitch for use as a binder has been reported in the literature. No clear conclusion regarding the importance of Ql in determining the
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Therefore, an attempt to separate low temperature coal tar by extraction [22], [23], atmospheric/vacuum distillation [21] and column chromatography methods [24] was made to obtain more information about the structure and composition of phenolic compounds in low temperature coal tar. It was found that pyrenol was the most complex …
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Also, with regular and accurate control of the coking value index as a very important laboratory parameter, the volume of coke sediments in the coal tar feed entering the distillation column was ...
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Composition analysis of coal tar remains a challenging task because of its complex components. In this paper, the compositions of low temperature coal tar (LTCT) and the wash oil fraction of high temperature coal tar (HTCT) were studied. A thermogravimetric analyzer (TG) combined with gas chromatography–mass …
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Separation characteristics of low-temperature coal tar containing solid particles by vacuum distillation: Effects of distillation pressure and solid particle …
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technological parameters of the distillation columns, the estimated extraction costs will amount to 5.64 Gcal per ton of commercial phenol. 1 Introduction Coal tar is a by-product of metallurgical coke or oil coke production. There are many works devoted to an increased yield and improved quality of needle coke [1-5]. Coal tar has a
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Coal tar is a waste produced in industrial fields such as steel, power plant, and the cement industry. As a potential fuel source for its component, utilization of coal …
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The naphthalene content in the commercial product derived from coal tar in this system is 99.99 wt %., while the yield of naphthalene is at least 90.5 wt %. (3) In the basic three-column system, the total heat consumption is 0.92 Gcal/t of commercial naphthalene (of purity 99.99 wt %). (4) If heat is recycled in the three-column system, the ...
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The utility model belongs to coal tar processing separation technology field, and in particular to a kind of coal tar atmospheric and vacuum distillation system, including head tank, distillation still, condenser, fluid reservoir and vacuum pump；One end is provided with first charging aperture at the top of the distillation still, the other end is provided …
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Higher vacuum pressure of distillation is not necessarily high to meet specifications. ... Coal tar pitch is a residue of coal tar distillation and can be processed suitably to produce hard pitch ...
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a further purpose is to distill coal tar that contains a substantial amount of naphthalene and a relatively low .amount of solvent fraction by adding solvent to the tar, or to the vapors therefrom, during distillation and subsequently fractionating the vapors so that the naphthalene fraction produced on distillation may be removed from .a fractionating …
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The first coal chemical recovery ovens were installed in the United States in 1893. By 1915, by-product ovens accounted for 97% of the metallurgical coke produced in the United States. These by-product ovens produced coal tar as one of the major by-products. An industry developed around distillation of coal tar to produce various products.
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Graphical abstract. High-temperature coal tar is an important raw material for obtaining value-added aromatics. The comprehensive processing route for value …
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Four commercially available coal tar pitches are used as raw materials. Bilbaina de Alquitranes S.A., Spain, produces pitches A and B by heat treatment of coal tar to 653 K and Industrial Quı́mica del Nalón, Spain, prepares pitches C and D by vacuum distillation of coal tar to 653 K. The pitches were fractionated with quinoline and …
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The utility model discloses a kind of injection apparatus in coal tar deep processing vacuum distillation, are related to coal tar deep processing technical field.The utility model includes oil groove, the delivery outlet of oil groove is communicated with flushing oil pump by oil pipe, the delivery outlet for rinsing oil pump has been respectively …
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As a potential fuel source for its component, utilization of coal tar by catalytic cracking into fuel source and its separation using fractional vacuum distillation …
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Description: For vacuum distillation of crude coal tar, the crude coal tar is produced from coke ovens of steel plant, 50% of this crude coal tar is pitch. The crude coal tar is then taken to vacuum distillation columns for fractionating into various components. Coal tar is produced by the dry distillation of coal and is therefore a by product ...
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In this regard, coal tar is emerging as an alternative source of feedstock to the refiners for producing fuels. Vacuum distillation is the technique used to separate …
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As already mentioned that coal tar is a complex mixture of hydrocarbons with wide range of molecular weights, so to convert coal tar into coal tar pitch, lower molecular weight hydrocarbons need to be removed from the coal tar. Here, a vacuum distillation assembly was used for converting coal tar into coal tar pitch. For synthesis of coal
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Vacuum machine in coal tar of application. High-temperature tar is a kind of extremely complex mixtures, might not directly extract phenol, naphthalene and other single component products, need to taking various fractions, by distilling the single-component product concentration of the extract concentration into the corresponding fractions, and …
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Starting from thermal processes like heat treatment, vacuum distillation, tar air blowing, to chemical treatments like nitric acid treatment, HF/BF 3 method, all methods have successfully produced spinnable precursors. However, further investigation on the effect of different foreign particles on mesophase formation from a thermodynamic point ...
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Seven fractions were isolated from heavy coal tar in low-temperature coal tar from Northern Shaanxi by vacuum distillation (1 kPa) at 100â, 100-170â, 170-200â, 200-240â, 240-270â, 270-300â and 300-340â, respectively.Their distillate compositions were characterized by gas chromatography/mass spectrometry (GC-MS).
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The vacuum system provides the negative pressure required by the coal tar distillation process. The key part of vacuum system is piston vacuum pump. The mechanical pump is vacuumized …
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Steady-state simulation of preflash, atmospheric column (pipestill), and vacuum distillation units in a crude oil distillation plant was performed using an Aspen Plus simulator. The object of this work was to make a computer simulation using different mixed crude's: Dubai and Basara (crude 1) and Dubai and Bomby High (crude 2). ...
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A catalytic distillation and coal tar technology, applied in the field of coal chemical industry, to achieve the effect of improving the extraction rate ... Free Trial. Heavy coal tar vacuum catalytic distillation method. What is Al technical title? Al technical title is built by PatSnap Al team. It summarizes the technical point description of ...
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The separation of low-temperature coal tar (LTCT) containing solid particles by vacuum distillation is essential in various applications, such as in-situ pyrolysis. However, the separation characteristics of solid-containing LTCT using vacuum distillation have yet to be fully understood.
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The paper presents the development of complete, rigorous and integrated models including all units of the atmospheric and vacuum distillation lube oil plant, from the Petrogal Porto Refinery. The models created, with the PROII process simulator, allow the increase of the plant knowledge, the detection of the plant bottlenecks, the …
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