Decomposition of conc. H₂O₂ solution by carbons was studied. Amount of decomposed substances were larger when minute: crystallite carbon article are thrown in the solution. Also more vigorous decomposition was observed when lower carbonization carbon used. Highly electrographitized carbon was almost indifferent to decomposition.
The decomposition probably occur by uneven surfaces of carbon crystals caused by remaining organic radicals by imperfect carbonization and irregular zones of contact portions of minute carbon crystallites.

View full abstract

From the considerations of the previous paper, ⁽¹⁾ it is concluded that the higher caking value of constituent besides free carbon in pitCh, the stronger caking power itself; in other words, the larger the difference between flied carbon and free carbon in pitch, the stronger the coking power of the pitch.
In this paper the carbonization reaction of pitches were attempted to investigate as the chief aim to increase the residual carbon in carbonization in pitches.
Caking value of pitch largely depends upon the velocity of temperature rise. Under 1°/min the effect is small.
Thermal decomposition takes place between 250°C to 450°C vigorously.
According to the composition change of pitch by means of heating, the loss of carbon attains 35-52% until 600°C, is recognized.
In the case of holding pitch at a constant temperature, the actual rate of increase of free carbon is not specially high at a certain temperature on account of the conjugate relation between condensation and decomposition.
That the free carbon in pitch acts as it nucleates id: the condensation reaction of bitumen, was concluced.
Though gamma 1 and gamma 2, so called strongly caking fractions posess low caking value individually themselves, they, indicate high value when coexist with other fractions for instance alpha etc.,

View full abstract

“Natural charcoal” of Mompon ai Mines in Hokkido is the charcoal, buried & partially (2/3) carbonized naturally and is superior in its low content of ashes. Calcining it under pressure we can get raw carbon material like pitch cokes, of which . yield is about 55% (Its characteristics are as follows).
The calcined, hardened matter may be used in place of pitch as the raw materials of producing anodes for aluminium electrolysis, and as the reducing agent for green silicon carbide, for the direct method of producing silmin, and for the chlorination of MgO into MgCl₂.

View full abstract