scholarly journals Study of Quinoline Insoluble (QI) Removal for Needle Coke-Grade Coal Tar Pitch by Extraction with Fractionalized Aliphatic Solvents and Coke Formation Thereof

2021 ◽  
Vol 11 (7) ◽  
pp. 2906
Author(s):  
Jung-Chul An ◽  
Seong-Young Lee ◽  
Joo-Il Park ◽  
Manyoul Ha ◽  
Joongpyo Shim ◽  
...  
Keyword(s):  
Coal Tar ◽  
Coke Formation ◽  
Polarized Light ◽  
Extraction Process ◽  
Coke Production ◽  
Coal Tar Pitch ◽  
Needle Coke ◽  
Process Yield ◽  
Anisotropic Flow ◽  
Kinetics Of

Various fractionalized solvents with different paraffinicities were adopted to maximize the efficiency of the quinoline insoluble (QI) extraction process for coal tar pitch. In addition, highly pressurized conditions combined with raised temperature (4 bar at 300 °C) were used to accelerate the reaction kinetics of the extraction process. The QI content of purified coal tar pitch was analyzed to be 0.1% at a process yield of up to 72% as a solvent with a K-factor of 10 and above was used. Purified coal tar pitch was then processed to form anisotropic coke using a lab-scale tube bombe reactor. The texture observed under a polarized light microscope showed an anisotropic flow domain, a unique morphological feature of needle coke. The additives and reaction conditions used in this study for QI extraction for coal tar pitch were found to be effective and feasible as preliminary processing in needle coke production.

Research on Coal Tar Pitch Based Needle Coke Production Quality

2013 ◽  
Vol 711 ◽  
pp. 155-160 ◽  
Author(s):  
Xia Ping Zhou ◽  
Dong Sheng Xu ◽  
Pi Xiang Zhang ◽  
Si Cong Yin ◽  
Ju Xing Long ◽  
...  
Keyword(s):  
Kinetic Model ◽  
Thermal Sensitivity ◽  
Coal Tar ◽  
Thermal Conversion ◽  
Coke Production ◽  
Production Quality ◽  
Experimental Results ◽  
Coal Tar Pitch ◽  
Needle Coke ◽  
Calculated Concentration

The article developed a five-lump kinetic model for delayed coking through needle coke. The kinetic parameters were determined using the experimental results of the genetic algorithm method. The results showed the calculated concentration distribution agreed well with the experimental results. The results of five-lump kinetic model that composed of parallel and serial reactions and their activation energy also showed that the thermal sensitivity of coal tar pitch declined and that the orderly orientation strengthened under external magnetic field. This facilitates the formation of wide mesophase pitch structures in thermal conversion.

Kinetics of Fuzed Periclase Wetting with Coal-Tar Pitch

2016 ◽  
Vol 57 (3) ◽  
pp. 304-307
Author(s):  
G. A. Lysova ◽  
S. I. Borovik
Keyword(s):  
Coal Tar ◽  
Coal Tar Pitch ◽  
Kinetics Of

scholarly journals XRD Characterization of the Structure of Graphites and Carbon Materials Obtained by the Low-Temperature Graphitization of Coal Tar Pitch

2015 ◽  
Vol 17 (2) ◽  
pp. 87 ◽  
Author(s):  
Ch.N. Barnakov ◽  
G.P. Khokhlova ◽  
A.N. Popova ◽  
S.A. Sozinov ◽  
Z.R. Ismagilov
Keyword(s):  
Low Temperature ◽  
Carbon Materials ◽  
Coal Tar ◽  
Structural Phase ◽  
Coherent Scattering ◽  
Amorphous Structure ◽  
Coal Tar Pitch ◽  
X Ray Diffraction ◽  
Needle Coke ◽  
The Individual

The structure of some commercial graphites and carbon materials (CMs) obtained by the low-temperature catalytic graphitization of coal tar pitch with iron salt, needle coke, foamed graphite as the catalysts has been studied. The study was performed using the X-ray diffraction technique with reflections from base plane and their decomposition into two components corresponding to the structural phases of graphite which have different XRD characteristics. Various CMs were compared with respect to the structural phase ratio, distance between polyarene layers in these phases, and sizes of the coherent scattering regions. The (004) reflection provided a better fit of some properties of graphites to the calculated XRD characteristics as compared to calculation from the (002) reflection. In the case of carbonization of coal tar pitch with investigated catalyst additions, prepared carbon materials have a higher degree of graphitization and a crystallite size greater than in the other case of carbonization of the individual pitch. The highest catalytic activity is shown by foamed graphite. It was found that the use of foamed graphite as the catalyst at 800-900 ºC produced carbon materials possessing a crystalline structure with interplanar spacing close to that in commercial graphites, while in the absence of catalyst the coal tar pitch material has an amorphous structure.

The effect of mechanical vibration on the structure of needle coke prepared from a modified coal tar pitch

Carbon ◽  
2018 ◽  
Vol 130 ◽  
pp. 845 ◽  
Author(s):  
Ying Wang ◽  
Ya-wei Dong ◽  
Cun-gui Zhong ◽  
Qing Cao
Keyword(s):  
Coal Tar ◽  
Mechanical Vibration ◽  
Coal Tar Pitch ◽  
Needle Coke

Carbonization of coal-tar pitch into lump needle coke in a tube bomb

1987 ◽  
Vol 22 (11) ◽  
pp. 3989-3994 ◽  
Author(s):  
Sao Mochida ◽  
You Qing Fei ◽  
Takashi Oyama ◽  
Yozo Korai ◽  
Hiroshi Fujitsu
Keyword(s):  
Coal Tar ◽  
Coal Tar Pitch ◽  
Needle Coke

The Influence of Alkyl Group on Needle Coke Formation

2011 ◽  
Vol 335-336 ◽  
pp. 1433-1438 ◽  
Author(s):  
Shu Lei Song ◽  
Xiang Lin Cheng
Keyword(s):  
Coefficient Of Thermal Expansion ◽  
Average Length ◽  
Coal Tar ◽  
Coke Formation ◽  
Needle Coke ◽  
Alkyl Groups ◽  
Uniaxial Orientation ◽  
Lower Viscosity ◽  
Solidification Stage ◽  
Unit Vectors

Co-carbonization properties of toluene soluble (TS) of coal tar pitch and waste polystyrene (WPS) were studied in a tube bomb to correlate the content of alkyl groups in the mesophase pitches with coefficient of thermal expansion (CTE) and anisotropic orientation. The alkyl contents, which were increased from 12.0% to 33.3% by adding WPS into TS, improved the properties of resultant needle coke in terms of optical texture and CTE value. The anisotropic indices of average length of vectors parallel to the CTE axis and average length of anisotropic unit vectors increased from 20.8 μm to 28.4 μm and 23.4 μm to 28.8 μm, respectively, and CTE value decreased from 0.8×10-6 /°C to 0.1×10-6 /°C. Due to the increasing alkyl groups, the lower viscosity of the carbonization system favored the development of flow texture and uniaxial orientation. And the sufficient gas evolution of good timing in co-carbonization forced the uniaxial arrangement of bulk mesophase molecules at the solidification stage.

scholarly journals Preparation of Isotropic Carbon Fibers from Kerosene-Purified Coal Tar Pitch by Co-Carbonization with Pyrolysis Fuel Oil

Materials ◽  
2021 ◽  
Vol 14 (21) ◽  
pp. 6280
Author(s):  
Seon Ho Lee ◽  
Song Mi Lee ◽  
Seungjoo Park ◽  
Seong-Ho Yoon ◽  
Haksoo Han ◽  
...  
Keyword(s):  
Carbon Fibers ◽  
Low Cost ◽  
Coal Tar ◽  
Average Diameter ◽  
Extraction Process ◽  
General Purpose ◽  
Fuel Oil ◽  
Coal Tar Pitch ◽  
Pyrolysis Fuel Oil ◽  
Isotropic Carbon

An inexpensive and general-purpose carbon fiber was prepared using coal tar pitch. In contrast to the solvent extraction process employing expensive solvents, a low-cost centrifugal separation method facilitated the reduction of loss due to the pitch purification and an overall yield increase. The coal tar pitch purified by centrifugation and subsequently co-carbonized with pyrolysis fuel oil improved in spinnability. Moreover, the resulting spinnable pitch had a softening point of 250 °C. The obtained carbon fibers were heat-treated at 1000 °C for 5 min, resulting in a tensile strength of approximately 1000 MPa and an average diameter of 9 μm. In this study, we present an effective method for obtaining low-cost general-purpose isotropic carbon fibers.

scholarly journals Thermogravimetric Determination of the Kinetics of Petroleum Needle Coke Formation by Decantoil Thermolysis

ACS Omega ◽  
2020 ◽  
Vol 5 (45) ◽  
pp. 29570-29576
Author(s):  
Natalia K. Kondrasheva ◽  
Viacheslav A. Rudko ◽  
Jorge Ancheyta
Keyword(s):  
Coke Formation ◽  
Needle Coke ◽  
Kinetics Of
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