184 ex 



FROM LIME-SOAP. 



217 c.c. 

 5 c. c. 



Capacity of balloon, • 



Air remaining in balloon, 



Height of barometer, ...... 755.4mm at 19 



Density of vapor found, 3.001 



2.9046 



o 



" " theoretical, (C12 H12), 





1 



The sp. gr. of the liquid was found to be 0.6938 at 0.° A portion of the fraction 

 67£°-68°, purified as above, and now boiling at 68.5°(corrected), being analyzed, af- 

 forded the following result: 0.159 grm. of the hydro-carbon gave 0.2176 grm. water, 

 and 0.4935 grm. carbonic acid, or carbon 84.G5 % and hydrogen 15.22 %. Taken in 

 connection with the boiling point of this body, and its petroleum-like odor, the analysis 

 points at once to that hydride of caproyl which boils at 68°-69°, and which has been 

 isolated from coal-oil by Greville Williams * Schorlemmer, and others. 



The method of purification with monohydrated sulphuric acid was here resorted 

 to, in the hope that by this means the caproylene with which the body was supposed 

 to be contaminated might be removed. The action of the concentrated acid, so far as 

 the destruction of impurities is concerned, was apparently feeble ; the acid did not even 

 blacken, but only became yellow, though some warmth was evolved, and hence only a 

 single portion of it was employed. But the acid evidently combined with a considerable 



* 



portion of the hydro-carbon, a certain quantity of a compound much less volatile than 

 the hydro-carbon being formed. After having been decanted from the acid sediment, 

 washed with caustic alkali, and dried over chloride of calcium, and then heated in an 

 ordinary retort, the hydro-carbon began to boil at 72°, the temperature gradually ris- 

 ing, as the distillation proceeded, to 81°, at which point the operation was interrupted 

 and the oily residue in the retort put aside. On redistilling this distillate upon sodium 

 almost all of it came over at 69.5°(corrected). 



The last named product was now analyzed with the following result: 0,1111 grm. 

 of the hydro-carbon gave 0.1633 grm. water, and 0.3417 grm. carbonic acid, or 



round. 



Theory 



Carbon 83.89 C12 83.72 



Hydrogen 16.38 s H14 16.28 



I 



100.27 



100.00 



It is evident, therefore, that this body, boiling at 68°-69° (corrected), is probably iden- 

 tical with the hydride of caproyl of Schorlemmer, and of Warren ; and that the 

 concentrated sulphuric acid did really remove caproylene from the product first 

 analyzed. 



* 



Philosophical Transactions, 1857, CXLVTL pp. 452, 461. 



• 







