Hydrogen pressurized carbonization of a bituminous coal into needle-like coke of anisotropic flow texture.
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A bituminous coal of low ash content was carbonized in an autoclave under atomospheric and pressurized gases (N<SUB>2</SUB>, He and H<SUB>2</SUB>) to prepare needlelike coke directly from the coal . The carbonization under atmospheric as well as pressurized (101 kg/cm<SUP>2</SUP>) nitrogen and helieum produced fine mosaic cokes, whereas the pressurized hydrogen was found to be very favourable for the better anisotropic development. Hydrogen pressure of 51 kg/cm<SUP>2</SUP> provides the coarse mosaic texture .Higher pressure of 101 kg/cm<SUP>2</SUP> allows the development of anisotropic flow (50%) and domain (30%) textures in the resultant coke.<BR>Yields and densities were almost constant to be 90% and 1 .8 g/cm<SUP>3</SUP>, respectively, regardles of the carbonization atomospheres . However, higher hydrogen pressure lowered the apparent density of the resultant coke, suggesting the lower viscosity of the carbonization system under the hydrogen pressure while devolatilization take place. The coke carbonized under high hydrogen pressures was found to contain less oxygen.<BR>The carbonization at 400°C-lhr and 2hr under hydrogen pressure of 101 kg/cm<SUP>2</SUP>yielded a pitch-like material, which contained spherical mesophases in the major isotropic matrix, wheareas that under atmospheric hydrogen gave the semi-coke of mosaic texture which was quite similar to that observed in the coke produced at 450°C. IR spectra revealed that the former material carried more naphtenic and paraffinic C-H bands than the latter.<BR>Based on these results the pressurized hydrogen is concluded to remove oxygen functionalities, induced naphtenic structures in the coal molecules and controll the poly-condensation during the carbonization to be favourable for the development of anisotropic flow texture from the coal.
- 一般社団法人 日本エネルギー学会の論文
一般社団法人 日本エネルギー学会 | 論文
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