Carbonization properties of carbonaceous substances oxidized by air blowing—II

Mochida, Isao; Inaba, Toshiaki; Korai, Yozo; Takeshita, Kenjiro

doi:10.1016/0008-6223(83)90238-5

Cited by 15 publications

(2 citation statements)

References 15 publications

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“…Accordingly, ET is expected to be an ideal raw material for preparing a spinnable pitch. In addition, atmospheric distillation and air blowing are the most common methods to prepare a spinnable pitch for CF production [12,13,14,15,16]. Compared to atmospheric distillation, which mainly involves the removal of light components and condensation polymerization of heavy components during the reaction, air blowing is recognized as an effective method to increase the softening point (SP) and the yield of the pitch.…”

Section: Introductionmentioning

confidence: 99%

A Comparison of Ethylene-Tar-Derived Isotropic Pitches Prepared by Air Blowing and Nitrogen Distillation Methods and Their Carbon Fibers

et al. 2019

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Two isotropic pitches were prepared by air blowing and nitrogen distillation methods using ethylene tar (ET) as a raw material. The corresponding carbon fibers were obtained through conventional melt spinning, stabilization, and carbonization. The structures and properties of the resultant pitches and fibers were characterized, and their differences were examined. The results showed that the introduction of oxygen by the air blowing method could quickly increase the yield and the softening point of the pitch. Moreover, the air-blown pitch (ABP) was composed of aromatic molecules with linear methylene chains, while the nitrogen-distilled pitch (NDP) mainly contained polycondensed aromatic rings. This is because the oxygen-containing functional groups in the ABP could impede ordered stack of pitch molecules and led to a methylene bridge structure instead of an aromatic condensed structure as in the NDP. Meanwhile, the spinnability of the ABP did not decrease even though it contained 2.31 wt % oxygen. In contrast, the ABP had narrower molecular weight distribution, which contributed to better stabilization properties and higher tensile strength of the carbon fiber. The tensile strength of carbon fibers from the ABP reached 860 MPa with fiber diameter of about 10 μm, which was higher than the tensile strength of 640 MPa for the NDP-derived carbon fibers.

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Section: Introductionmentioning

confidence: 99%

A Comparison of Ethylene-Tar-Derived Isotropic Pitches Prepared by Air Blowing and Nitrogen Distillation Methods and Their Carbon Fibers

et al. 2019

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“…A series of Lewis acids such as AlCl 3 and FeCl 3 have been examined in the carbonization, [14][15][16] whose condensation activity increased markedly the carbon yield. AlCl 3 has been recognized an excellent catalyst to provide anisotropic carbon from aromatic hydrocarbons, except for benzene, at a very high yield.…”

Section: Catalytic Carbonizationmentioning

confidence: 99%

Catalysts in syntheses of carbon and carbon precursors

Mochida¹,

Yoon²,

Qiao³

2006

J. Braz. Chem. Soc.

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Materiais de carbono têm sido aplicados em diferentes campos, devido ao seu desempenho e aplicação únicos. Naturalmente, as estruturas físicas e químicas dos precursores de carbono e materiais de carbono definem as suas propriedades e aplicações. Os catalisadores apresentam um papel importante na síntese de precursores de carbono e materiais de carbono, por controlar a química composicional e molecular na transformação de substratos orgânicos em carbono, através de intermediários carbonáceos. Um desempenho maior dos materiais de carbono pode ser obtido, a custos mais baixos, através da seleção cuidadosa de catalisadores e processos catalíticos adequados na síntese de fontes de carbono, na carbonização, ativação, grafitização, modificação de precursores de carbono e no crescimento destes materiais de carbono.Carbon materials have been applied in different fields because of their unique performances. Naturally, the physical and chemical structures of carbon precursors and carbon materials decide their properties and applications. Catalysts play a very important role in the synthesis of carbon precursors and carbon materials by controlling the molecular and compositional chemistry at the transformation of organic substrates into carbon through carbonaceous intermediates. Carbon materials of high performance and low production cost can be realized, through carefully selecting suitable catalysts and catalytic processes in the synthesis of carbon feed, carbonization, activation, graphitization, and modification of carbon precursors, and carbon growth.

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