Carbonization under high pressure

The present report deals with the carbonization of coals such as Tempoku coal (C%, 71. 8), Taiheiyo coal (C%, 77.5) and Yabari (C%, 84. 3) at about 20, 600, 800, 1000 kg/cm2 in order to examine the effects of carbonization pressure.From the results of proximate analyses, ir analyses, x-ray diffraction analyses, nmr measurement and structural analyses using densimetric method of carbonization products and their pyridine extracts andresidues, it proved that carbonization products of both Tempoku coal (low rank coal) and Y-abari coal (coking coal) were affected by carboni-zation pressure, and that the latter was more sensitive under high carbonization pressure.In the case of Tempoku coal, the yield and the aromaticity varied under high carbonization pressure while the volatile matter did not changs. Then it would actually be difficult to find what parts of the coal substances had been affected carbonization pressure.