Carbonization of low rank coal under hydrogen pressure.

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Carbonization of low rank coal under high hydrogen pressure was studied. Our interest is to clarify the effects of hydrogen pressure and soaking time on the resultant cokes. The longer the: soaking time at 748 K under 5 MPa, the more extensive the development of anisotropic texture and the greater the size of optical texture. The effect of hydrogen pressure on the resultant cokes was found to be optimal at 5 MPa. However, no significant change in the anisotropic texture of the resultant cokes was observed when the hydrogen pressure was increased from 5 to 13 MPa. The effect of partial pressures of hydrogen on the carbonization reaction was also examined. When the partial pressure of hydrogen decreases, the extent of the anisotropic texture is reduced. The carbonization of Yubarishinko coaking coal was also carried out under high hydrogen pressure. The optical texture of resultant cokes for a hydrogen pressure of 8 MPa shows flow anisotropy. Moreover, the effect of selenium oxide catalyst on pressure carbonization was also studied. SeO2, which is especially effective in the early stage of carbonization, enhanced the mesophase development for Taiheiyo coal.
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