18G 



EXAMINATION OF A NAPHTHA FROM LIME-SOAP. 



of the hydro-carbon had distilled over, the thermometer in the retort rapidly rose to 

 above its upper limit, 120°, the liquid in the retort became black, and sulphurous acid 

 was evolved. The distillation was at once interrupted and the residue put aside. The 

 distillate, being now repeatedly redistilled over sodium, came over clear at 79.5° (cor- 

 rected). For an analysis of this sample, see below, No. III. 



treatment with diluted acid 

 uric acid, the first distillation 



A second portion of the product resulting from the 

 having been treated, as above, with monohydrated sulpl 



dium 



more 



carefully watched than before 



The retort being heated 



79 



O 



yti 



t small flame, its contents distilled over freely at first, and without coloration, at 

 after a while the temperature of the retort rose slowly, and at 87° scarcely 

 ing came over. At this point the distillation was stopped, the liquid in the retort 



being quite oily, though still light-colored. On redistilling the distillate, upon sodium, 



it came oiF at 79.9° (corrected). 



The bottle containing the product (No. III.) resulting from the treatment with mono- 

 hydrated acid, was now immersed in a mixture of ice and salt until the moment when 

 crystals began to form, when it was quickly removed and the still liquid portion of the 

 hydro-carbon poured off, the bottle being inverted and the crystals allowed to drain as 

 they melted until only a comparatively small portion of the solid remained. This last 



was then subjected to analy 



below, No. IV 



The quantity of material at our disposal being small, we were unable to carry 

 any systematic course of purification by crystallization, and a single operation like 

 preceding could hardly be expected to augment the purity of our product to any g 

 extent. But the tendency of this experiment is none the less worthy of being noi 



points in the direct 



indicated by the preced 



trials 



Each step 



the series of treatments above recorded brings us a little nearer to the pure benzole of 



hich, as we have ourselves no doubt 



mainly composed 



I 



product (80°-81°), obtained by distillation 



di 



As ha S a i r eady been stated, 0.2685 grm. of the unpurified hydro-carbon, obtained 



and fractional condensation, gave 0.2203 grm. water, and 0.8849 grm. 



carbonic acid 



II. 0.1914 grm. of the hydrocarbon, after treatment 

 grm. water, and 0.6386 grm. carbonic acid 



diluted acid, gave 0.1593 



III 



0.1485 grm. of the hydrocarbon, after treatment with monohydrated sulph 



acid, gave 0.113 grm. water, and 0.4985 grm. carbonic acid 



IV. 0.1962 



g 



and 0.C631 grm. carbonic acid 



of the hydrocarbon, after crystallization, gave 0.1484 g 







