2:^0 



6. Tlie bromine value caused l)v addition of the oils obtained 

 Ity Iterminisation is lower than that of the coiiesponding cracking 

 experiments. It is, iiowever, very risky to draw general conchisions 

 from this bromine value, for dissolved unsaturated gases can have 

 a great intkience on the halogen value. 



Tiie example given here proves convincingly that a determination 

 of the yield of oil and gas from a solid substance does not suffice 

 to enable us to form a correct opinion on the process of Behgius. 

 A comparative ci'acking experiment is lequired for this. Possible 

 results refer o\\\y to the procedure followed, in this case to the 

 periodic process, the temperature at the experimenting etc. 



It is self-evident that in practice processes that [)roceed continu- 

 ously, will be prefei'red. It may, however, be considered to be an 

 established fact that when Rekgius' method of procedure is followed, 

 important cpianlities of hydrogen added fiom the outside, are che- 

 mically bound. After the .scientific researches of Sabatik.r c.s. con- 

 cerning the hydrogenatiou of hydro carbonic vapours with catalyst and 

 the technical hardening of fatty oils (Normann and others), this fact, 

 combined with the absence of express addition of catalyst, may be 

 considered as the third great discovery in the region of hydrogenatiou. 



Delft, Lahoratorij of Chemical Technology 

 of the Technical- University. 



