Abstract
Yubari Coal were subjected to mild reaction conditions, and afollow up on the changes in structural parameter of the reaction products in the course of reaction was carried out as part of the investigation on the reaction mechanism of bydrogenolysis. At the same time two or three discussions were made on the chemical structure of coal,
(1) Original coal samples, Py-2, Py-1 showed highly similar structural charac-teristics and it was surmized that the decrease the molecular weight of the original coal to Py-1 could be mainly attributed to cleavage of the linkagebetween structural units accompanying deoxigene.
(2) It was shrmized that Py-1 as compared with A has a larger number of pericondensd rings. Further in the course from py-1→A it may be surmized fhat the production of side chains arizing from saturation of terminal aromatic rings is accompanied by cleavage of the linkage of structural units.
(3) From A→O2 while saturation of aromatis rings is proceeding, the decomposition of structural units is limited and the main reaction of pecrease the molecular weight is the cleavage of linkage of the structural units. It was also clarified that the decomposition of structural units was remarkable at the O2→O1 stage.
(4) As pointed out hitherto it was reconfirmed that among Yubari coals there are two types oxygen. Namely one in which the oxygen reactivity is repidly removed and the other in which the removal is compalatively slow.
(5) Similar to the case of oxygen, there are also 2 types of sulfur. And it was recognized that inactive parts are removed only after the decomposition of structural units. It was also noted that nitogen exhibited a similar behavior to that of inactive sulfur.
