Chemistry. — " Hijdrogenaüon oj Pnvaffin 6»/ ^/ig Bergius' Method". 

 By Prof. H. I. Waterman and .]. N. J. Pkrqüin. (Commiiuicated 

 by Prof. J. Boeseken). 



(Communicated at the meeting of February 24, 1923). 



In a previous coinmnnlcation on tlie liydrogenation by Beruius' 

 method of mineral oils or allied products, difTerent experiments were 

 discussed, wliicli were carried out with heavy Borneo-asplmlt-oil, 

 distillation residue (pitch) of this oil, and with asphalt obtained by. 

 distillation of Mexican crude oil '). 



The experiments in question, comprising- both cracking- and Iter- 

 ginisation experiments, were executed in a vertical immovable auto- 

 clave. 



That we have now chosen another material, technically perhaps 

 of less importance for this jturpose, is owing to the peculiar advan- 

 tages which commercial paraftin offers for such experiments over 

 other materials, as asphalt. Paraffin is much more easily analysed 

 than asphalt, and this holds also for the products prepared out of 

 paraffin, when they are compared with the corresponding substances 

 formed in the treatment of asphalt. Thus paraffin yields products 

 that are less strongly coloured than Mexican asphalt. For these 

 experiments we had an autoclave at our disposal which could be 

 shaken continuously '). 



The way of procedure was for the rest quite analogous to the 

 earlier experiments; tlie arrangement of the apparatus is re[)resented 

 in fig. 1. The capacity of the autoclave was about 2500 cm.', the 

 heating took place bj' means of gas, in such way that the tempe- 

 rature could be regulated accurately to a few degrees. 



The paraffin had a Sp. Gr. (I57150) of 0,913, the solidifying point 

 (Shukoff method) was 50,6°, the bromine-value, (addition) determined 

 by Mc. Ii.hiney's method '), was 0,5. 



') Congres international des combustibles liquides, Paris, 9 — 15 Octobre 1922; 

 Chimie et Industrie, numero spécial, Mai 1923, p. 200. 



') Apparatus supplied by Andreas Hoper, chief instrument-maker at the 

 laboratory of Prof. Dr. Franz Fischer, Kaiser Wilhelm Institut fur Kohlenfor- 

 schung, Miilheim — Ruhr. 



S) Journ. Am. Ghem. Soc. 16, 275 (1894), 21, 1084 (1899), Journ. Soc. Chem. 

 Ind. 19, 320 (1900); H. Beckurts, Die Methoden der Massanalyse, Braunschweig 

 1913, p. 480. 



