Thermal Conversion Characteristics of Coal Tar Soft Pitch at Atmospheric and Elevated Pressures

2014 ◽  
Vol 1015 ◽  
pp. 467-471
Author(s):  
Li Yue ◽  
Xue Fei Zhao ◽  
Shi Quan Lai ◽  
Li Juan Gao ◽  
Jie Yang ◽  
...  
Keyword(s):  
Formation Rate ◽  
Coal Tar ◽  
Elevated Pressure ◽  
Thermal Conversion ◽  
Raw Material ◽  
Needle Coke ◽  
Consecutive Reaction ◽  
Elevated Pressures ◽  
Carbon Structures ◽  
Group Compositions

Coal tar soft pitch (CTSP) used as raw material of preparing needle coke was heat-treated at 460, 480 and 500 °C for different holding time under the pressure of 0 MPa and 0.25 MPa. The changes of group compositions such as toluene solubles (TS), toluene insolubles-quinoline solubles (TI-QS) and quinoline insolubles (QI) were mainly studies during the thermal conversion of the CTSP. The microstructure morphologies of some calcined cokes were characterized by scanning electron microscope (SEM). The results showed that the thermal conversion of the CTSP had the features of consecutive reaction, and the pressure could accelerate the conversion rate of TS and TI-QS and the formation rate of QI. The calcined coke derived from the semi-coke obtained at atmospheric pressure exhibited better and longer streamlined fiber structures than that of the semi-coke obtained at elevated pressure, while the latter possessed more compact carbon structures than the former.

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.

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.

scholarly journals The research on the sifting from processing of East Donbass refuse heap for manufacturing wall ceramics goods

2018 ◽  
Vol 196 ◽  
pp. 04055 ◽  
Author(s):  
Khungianos Yavruyan ◽  
Evgeny Gaishun ◽  
Yuliya Teryokhina ◽  
Vladimir Kotlyar
Keyword(s):  
Temperature Variation ◽  
Firing Temperature ◽  
Elevated Pressure ◽  
Compression Molding ◽  
Raw Material ◽  
Compression Pressure ◽  
Grain Composition ◽  
Methods Of Evaluation ◽  
Wide Range ◽  
The Way

The results of the research into sifting of eastern Donbass gob pile processing as raw material for manufacturing wall ceramics, that is popular industrial raw material of the region, are highlighted in the report. It is stated that the main sifting components are siltstones, clay slates, claystone, and sandstones. The main minerals of the sifting are feldspar, crystalline silica, mica, and hydromica. The haracteristic of sifting handling ability for which the most suitable is the way of goods compression molding at elevated pressure and reduced humidity is given. It is stated that the main technology factors are grain composition of raw material mass, its humidity, compression pressure and firing temperature. Variation of technology factors' data makes it possible to get different kinds of products (course, lining, arch brick) with a wide range of features. Methods of evaluation of quality merit rating and the way this rating affects properties of final product are offered. There is high economical perspective of sifting implementation for production of wall ceramics.

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
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