Carbonization behaviour of pitch in the presence of inert material

Obara, Toshiyuki; Yokono, Tetsuro; Sanada, Yuzo; Marsh, H.

doi:10.1016/0016-2361(85)90157-7

Cited by 14 publications

(6 citation statements)

References 11 publications

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“…The pyrolysis of petroleum residue in the presence of solid oxides has also been studied [17][18][19][20]. Some of them hindered hydrogen transference and lowered the size of optical textures (SiO 2 -Al 2 O 3 , MoO 3 -TiO 2 , Al 2 O 3 , Silica gel), while others such as fusible SeO 2 improve hydrogen transfer [20].…”

Section: Introductionmentioning

confidence: 99%

Preparation of mesophase pitch doped with TiO2 or TiC particles

Ramos-Fernández¹,

Escandell²,

Rodriguez-Reinoso³

2007

Journal of Analytical and Applied Pyrolysis

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Section: Introductionmentioning

confidence: 99%

Preparation of mesophase pitch doped with TiO2 or TiC particles

Ramos-Fernández¹,

Escandell²,

Rodriguez-Reinoso³

2007

Journal of Analytical and Applied Pyrolysis

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“…Effects of impurities were investigated by Obara et al [45]. When silica gel was added to FCC-DO, it reduced transferable hydrogen in the carbonization process and microstructure of coke [45].…”

Section: Feedstock Selectionmentioning

confidence: 99%

“…When silica gel was added to FCC-DO, it reduced transferable hydrogen in the carbonization process and microstructure of coke [45]. In addition, Marsh et al [46] demonstrated the effect of metal (Li, Na, K, Rb, Cs) hydroxides and carbonates to pitch leading to formation of isotropic carbon.…”

Section: Feedstock Selectionmentioning

confidence: 99%

Preparation of needle coke from petroleum by-products

Halim¹,

Im²,

Lee³

2013

Carbon letters

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Needle coke is an important material for graphite electrodes. Delayed coking is used to produce needle coke. Producing good quality needle coke is not simple because it is a multi-parameter controlled process. Apart from that, it is important to understand the mechanism responsible for the delayed coking process, which involves mesophase formation and uniaxial rearrangement. Temperature and pressure need to be optimized for the different substances in every feedstock. Saturate hydrocarbon, aromatic, resin and asphaltene compounds are the main components in the delayed coking process for a low Coefficient Thermal Expansion value. In addition, heteroatoms, such as sulphur, oxygen, nitrogen and metal impurities, must be considered for a better graphitization process that prevents the puffing effect and produces better mesophase formation.

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“…In the carbonization of coal tar pitch for the production of carbon fibers and electrothermic graphite, QI present in the pitch plays an important role by adding strength to the final product . Many types of QI have been identified, and their effects on mesophase formation during pitch processing have been examined in detail. − Brooks and Taylor 7 were the first to observe how QI adheres to the surface of the mesophase and interferes with the process of coalescence. Marsh 14 examined the effect of inert material such as silica gel on mesophase growth during carbonization of a petroleum pitch.…”

Section: Introductionmentioning

confidence: 99%

Interaction of Clay Additives with Mesophase Formed during Thermal Treatment of Solid-Free Athabasca Bitumen Fraction

Rahimi¹,

Gentzis²,

Fairbridge³

1999

Energy Fuels

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The coking propensity (mesophase appearance time and size) of a fraction of mineral-matterfree Athabasca bitumen vacuum bottoms was investigated using hot-stage (high-temperature and high-pressure) microscopy. The following variables were studied: (1) gas atmosphere (hydrogen and nitrogen); (2) different clay minerals and concentrations (kaolinite at 2 wt % and 5 wt %, illite at 5 wt %, and montmorillonite at 5 wt %). The results of repeated experiments indicated that the mesophase induction period was relatively insensitive to the gas atmosphere. However, the size of the mesophase measured over the same time period was larger and the growth was uninhibited under hydrogen compared with nitrogen. It was also observed that the use of different clays at different concentrations did not significantly affect the mesophase induction period. Kaolinite, at the same concentration, had a significant effect in reducing the size of the mesophase compared with illite and montmorillonite. The effect was more pronounced at higher concentrations of kaolinite. The formation of a small-size mesophase in the case of kaolinite can be explained in terms of the increasing apparent viscosity of the isotropic matrix. The possible mechanism of the clay-mesophase interaction is envisaged as follows: Clays stabilize the layer structure of mesophase, thus inhibiting the shear that is the characteristic form of mesophase deformation. The presence of kaolinite clay prevents the molecules in the pitch matrix from acting as lubricants and restricts the coalescence of the mesophase. Differences in the physical properties of the clays (shape, size, surface charge, and hydrophilicity) may explain the differences in the observed interactions between these clays and the mesophase. The present findings may have significant implications in delayed coking operations and in the prevention of foulant adhesion to the internal wall of furnaces and superheaters.

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Carbonization behaviour of pitch in the presence of inert material

Cited by 14 publications

References 11 publications

Preparation of mesophase pitch doped with TiO2 or TiC particles

Preparation of mesophase pitch doped with TiO2 or TiC particles

Preparation of needle coke from petroleum by-products

Interaction of Clay Additives with Mesophase Formed during Thermal Treatment of Solid-Free Athabasca Bitumen Fraction

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