Abstract
The process of extractive chemical disintegration of coal under hydrogen pressures was investigated in the influence of reaction temperatures (350-450°C), reaction times (0-12hr.), reaction pressures (5-200kg/cm2), difference of hydrogen or nitrogen atmosphere and of various coals on the variation of extraction yield, the H/C atomic ratio of extraction residue and it's surface area.
For the explanation of extraction process of coal, it should be taken into consideration that the reactivity of dissolved coal and of undissolved coal showed a remarkable change with the progress of the reaction because of disintegration and condensation reactions.
A definite correlation between extraction yield and the H/C ratio of extraction residue was found in a certain reaction temperature range. Therefore, it was considered that extraction residue had a similar molecular structure at the same extraction yield.
Furetheremore, the surface area of extraction residue changed with the progress of the reaction.
From these results, a model of a series of consequtive reactions was proposed.
But strictly speaking, in order to express the phenomena of extrative chemical disintegration of coal exactly, it should be thought that the reaction rate equation was constructed every reaction temperature.
