The Experts below are selected from a list of 174 Experts worldwide ranked by ideXlab platform
R. Menéndez - One of the best experts on this subject based on the ideXlab platform.
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preparation of low toxicity pitches by thermal oxidative condensation of anthracene oil
Environmental Science & Technology, 2009Co-Authors: Patricia Alvarez, R. Menéndez, R Santamaria, C Blanco, M Granda, Juan Sutil, Juan Jose Fernandez, Jose Antonio VinaAbstract:This article describes a novel industrial procedure for producing new pitches of low toxicity from anthracene oil, a byproduct of coal tar distillation. The procedure involves oxidative treatment in order to polymerize and condense the anthracene oil components followed by thermal treatment and distillation in order to obtain a pitch with the desired parameters. This sequence (oxidative treatment/thermal treatment/distillation) was repeated four times under reaction conditions of increasing severity in four cycles of anthracene oil processing to obtain the four pitches. The pitches had similar characteristics to those of standard binder coal tar pitches (e.g., softening point and wetting capacity). Because of the inherent composition of the parent anthracene oil, the pitches were found to be totally free of solid particles, i.e., primary Quinoline Insolubles and metals. The gas chromatography and gas chromatography/mass spectroscopy results revealed a consecutive decrease in toxicity with successive cycle...
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mesophase development in petroleum and coal tar pitches and their blends
Journal of Analytical and Applied Pyrolysis, 2003Co-Authors: E Mora, R Santamaria, C Blanco, M Granda, R. MenéndezAbstract:Abstract The behaviour of mixtures of an impregnating coal-tar pitch and a petroleum pitch during the early stages of carbonisation was studied, focusing on the formation and development of mesophase and the role played by primary Quinoline Insolubles (QIs). The blends were prepared in different proportions ranging from 20 to 80% of the impregnating pitch. The parent pitches and their blends were thermally treated at 430 °C for 3 h and the resultant products were characterized by thermal analysis and optical microscopy. The results showed that primary QIs not only control the coalescence of mesophase spheres but also the nucleation of new spheres in both parent pitches and their blends. Moreover, only the petroleum pitch was able to generate a massive amount of small spheres throughout the isotropic phase.
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THE INFLUENCE OF PRIMARY Quinoline Insolubles ON THE DEVELOPMENT OF SECONDARY Quinoline Insolubles IN COAL TAR PITCHES
Carbon, 1991Co-Authors: R. Menéndez, E.m. Gray, Harry Marsh, R.w. Pysz, E.a. HeintzAbstract:Abstract The development of secondary Quinoline Insolubles (2°QI) or mesophase has been studied by heat treating four different, commercially available coal tar binder pitches to a series of predetermined temperatures and hold times. The development of the 2°QI is discussed in terms of the shape and amount of the primary Quinoline Insolubles (1°QI) initially present in each pitch by examination of scanning electron micrographs of the extracted Quinoline Insolubles. The development of the 2°QI of these materials is compared with the development of 2°QI in a petroleum pitch where 1°QI is initially absent. Small, laboratory extruded graphite rods using each of the four binder pitches were produced in order to examine the influence of 2°QI development on typical graphite properties.
G. Predeanu - One of the best experts on this subject based on the ideXlab platform.
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microstructural characteristics of toluene and Quinoline Insolubles from coal tar pitch and their cokes
International Journal of Coal Geology, 2007Co-Authors: Cornelia Panaitescu, G. PredeanuAbstract:Abstract The structural composition of coal–tar pitch used in the preparation of the special binder-pitch, was determined with special emphasis on the optical properties of the β-resins, as typical components necessary to obtain electrodes of best quality through the pyrogenetic processes of baking and graphitization. In addition to raw toluene- and Quinoline-Insolubles (TI, QI), the corresponding cokes were analysed to evaluate, by structural composition and microtexture, the behaviour of pitch fractions during carbonization. The results suggest the dependence of the texture development on the type of toluene- and Quinoline-Insolubles and β-resins during processing conditions, which influence the mesophase formation. An original and important result of the carbopetrographical study is represented by the identification and evaluation of β-resins in the coke texture.
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Microstructural characteristics of toluene and Quinoline-Insolubles from coal–tar pitch and their cokes
International Journal of Coal Geology, 2007Co-Authors: Cornelia Panaitescu, G. PredeanuAbstract:Abstract The structural composition of coal–tar pitch used in the preparation of the special binder-pitch, was determined with special emphasis on the optical properties of the β-resins, as typical components necessary to obtain electrodes of best quality through the pyrogenetic processes of baking and graphitization. In addition to raw toluene- and Quinoline-Insolubles (TI, QI), the corresponding cokes were analysed to evaluate, by structural composition and microtexture, the behaviour of pitch fractions during carbonization. The results suggest the dependence of the texture development on the type of toluene- and Quinoline-Insolubles and β-resins during processing conditions, which influence the mesophase formation. An original and important result of the carbopetrographical study is represented by the identification and evaluation of β-resins in the coke texture.
Cornelia Panaitescu - One of the best experts on this subject based on the ideXlab platform.
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microstructural characteristics of toluene and Quinoline Insolubles from coal tar pitch and their cokes
International Journal of Coal Geology, 2007Co-Authors: Cornelia Panaitescu, G. PredeanuAbstract:Abstract The structural composition of coal–tar pitch used in the preparation of the special binder-pitch, was determined with special emphasis on the optical properties of the β-resins, as typical components necessary to obtain electrodes of best quality through the pyrogenetic processes of baking and graphitization. In addition to raw toluene- and Quinoline-Insolubles (TI, QI), the corresponding cokes were analysed to evaluate, by structural composition and microtexture, the behaviour of pitch fractions during carbonization. The results suggest the dependence of the texture development on the type of toluene- and Quinoline-Insolubles and β-resins during processing conditions, which influence the mesophase formation. An original and important result of the carbopetrographical study is represented by the identification and evaluation of β-resins in the coke texture.
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Microstructural characteristics of toluene and Quinoline-Insolubles from coal–tar pitch and their cokes
International Journal of Coal Geology, 2007Co-Authors: Cornelia Panaitescu, G. PredeanuAbstract:Abstract The structural composition of coal–tar pitch used in the preparation of the special binder-pitch, was determined with special emphasis on the optical properties of the β-resins, as typical components necessary to obtain electrodes of best quality through the pyrogenetic processes of baking and graphitization. In addition to raw toluene- and Quinoline-Insolubles (TI, QI), the corresponding cokes were analysed to evaluate, by structural composition and microtexture, the behaviour of pitch fractions during carbonization. The results suggest the dependence of the texture development on the type of toluene- and Quinoline-Insolubles and β-resins during processing conditions, which influence the mesophase formation. An original and important result of the carbopetrographical study is represented by the identification and evaluation of β-resins in the coke texture.
Jinxiang Dong - One of the best experts on this subject based on the ideXlab platform.
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a novel method for removing Quinoline Insolubles and ash in coal tar pitch using electrostatic fields
Fuel, 2012Co-Authors: Jinpin Li, Jinxiang DongAbstract:Abstract A technique for the removal of Quinoline Insolubles (QI) and ash in coal tar pitch (CTP) using a high-voltage electrostatic field (EF) was developed. QI and ash removal were carried out under an electrical field strength of 2.25 × 10 5 V/m and a temperature of 35 °C with oil washing as the solvent. The results showed that QI and ash can be deposited onto cathodes under optimal conditions. CTP obtained via the proposed treatment was QI-free and of low ash content. For comparison, QI removal using the centrifugal method (CM) was also performed. The deposits on the cathode were analyzed using X-ray diffraction and thermal analysis. The findings confirmed that the products obtained through EF and CM have very similar features. However, the energy consumption of EF during QI and ash removal was only one-twelfth that of CM. The proposed technique may be easily implemented in the industry scale and the deposits could be conveniently cleared from the cathode.
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A novel method for removing Quinoline Insolubles and ash in coal tar pitch using electrostatic fields
Fuel, 2012Co-Authors: Qing Cao, Jinxiang Dong, Xiaolin Xie, Li’e JinAbstract:Abstract A technique for the removal of Quinoline Insolubles (QI) and ash in coal tar pitch (CTP) using a high-voltage electrostatic field (EF) was developed. QI and ash removal were carried out under an electrical field strength of 2.25 × 10 5 V/m and a temperature of 35 °C with oil washing as the solvent. The results showed that QI and ash can be deposited onto cathodes under optimal conditions. CTP obtained via the proposed treatment was QI-free and of low ash content. For comparison, QI removal using the centrifugal method (CM) was also performed. The deposits on the cathode were analyzed using X-ray diffraction and thermal analysis. The findings confirmed that the products obtained through EF and CM have very similar features. However, the energy consumption of EF during QI and ash removal was only one-twelfth that of CM. The proposed technique may be easily implemented in the industry scale and the deposits could be conveniently cleared from the cathode.
Manoj Srivastava - One of the best experts on this subject based on the ideXlab platform.
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Enhancement of mesophase formation in paraffinic-rich clarified oil using transition metal catalysts (Cr and Cu)
Applied Petrochemical Research, 2019Co-Authors: Subhash Kumar, Manoj SrivastavaAbstract:In the present work, we have made attempts to prepare petroleum pitches from paraffinic-rich clarified oil (CLO) by giving thermal treatment at 370 °C in the presence of Cu and Cr catalysts. The feed CLO is predominantly paraffinic in nature, so it takes fairly large thermal soaking time (21 h) to convert into pitch having mesophase content below countable limits. To increase the mesophase content in the pitch or to make mesophase pitch, 3 wt % transition metal catalysts (Cu and Cr) were added to CLO. Addition of transition metal catalysts not only enhances mesophase formation but also helps to reduce thermal treatment time by promoting polymerization and condensation reactions at a faster rate. The mesophase formation pattern reveals that Cu and Cr catalysts increase the mesophase content from below countable limit to 12 and 9 vol %, respectively. This indicates that Cu and Cr showed better catalytic activity for mesophase formation growth. The effect of transition metal catalysts on physico-chemical properties (softening point, coking value, toluene Insolubles and Quinoline Insolubles) as well as the optical texture and physical properties of mesophase pitches were investigated by optical microscope, FT-IR, SEM, NMR, TG/DTG and XRD.
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Influence of oxidative and non-oxidative conditions on petroleum pitch properties
Journal of Scientific & Industrial Research, 2008Co-Authors: Manoj Srivastava, Ranvir Singh, Manoj Kumar, Upasna Agarwal, Manish GargAbstract:A series of pitches were prepared by thermal treatment of petroleum feedstock under oxidative and non-oxidative conditions at 350-450°C, to study transformation behavior of feed components. Influence of type of oxidizing gas and oxidizing agent on softening point (SP), coking value (CV), Quinoline Insolubles (QI) and toluene Insolubles (TI) was studied. Rate of increase of SP of pitch has been found more in oxidative conditions than in non-oxidative conditions. Oxidative conditions may also lead to reduction in stabilization period for making carbon fibers and activated carbon spheres. Formation of TI/QI is more under air/oxygen purging as compared to nitrogen purging.
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Upgrading Low Value Refinery Streams into Electrode Grade Petroleum Pitch
Petroleum Science and Technology, 2003Co-Authors: Manoj Srivastava, S. Gupta, M. Thapliyal, M. K. S. Aloopwan, R. S. Kaushik, I. D. Singh, M. Anwar, Madhukar O. GargAbstract:Abstract Petroleum pitch is an excellent precursor for a number of advanced carbon materials such as carbon fibres, carbon molecular sieves, mesocarbon micro-beads, activated carbon spheres, needle coke etc. Some of the refinery streams have good potential for making pitches. These streams are the by-products of petroleum refining processes. Currently, these streams are being sold as low value ‘fuel oils.’ The present study has been carried out to examine the feasibility of making electrode grade impregnating pitches from aromatic extract of waxy distillates, a by-product of lube refining. Pitches were prepared by thermally induced polymerization and condensation of aromatic extracts obtained by solvent extraction of waxy distillates. It was found that, it is possible to produce quality-impregnating pitches from aromatic extracts. These pitches are of good quality having key properties like softening point (112–128°C), coking value (>45 wt%) and Quinoline Insolubles (
