MABERY, — CONSTITUENTS OP PETROLEUM. 



151 



tion at 205°-2l0°. Its molecular weight, determined by the Beckmann 

 method, was found by Mr. Hudson to be 174 ; required for the formula 

 CioHoiCl, 176.5. 



In continuing the fractional distillation in vacuo of the chlorine pro- 

 duct from 173° Ohio decane, a small quantity, 3 c.c, collected at 170°- 

 180°, 80 mm., which distilled under atmospheric pressure at 240°-243°. 

 On account of decomposition, this portion was fractioned only five 

 times, but it gave on analysis a percentage of chlorine corresponding 

 to dichlordecaue : — 



I. 0.2690 gram of the oil gave 0.5549 gram CO2, and 0.2191 gram 

 H,0. 

 II. 0.2753 gram of the oil gave 0.5746 gram CO,, and 0.2111 gram 



H,0. 

 III. 0.3147 gram of the oil gave 0.4256 gram AgCl. 



ra. 



33.46 



A determination of the specific gravity of this dichlordecane at 20° 

 gave 1.0300, which may not be strictly correct on account of the small 

 quantity of the material. 



In determining the boiling point of this decane, 50 c.c. of the oil, 

 purified as thoroughly as possible, distilled at 173°. 6-1 74°. 6, mostly 

 below 174°, under a tension oi 760 mm. and with the mercury column 

 all within the vapor. 



The boiling point of normal decane was given by Krafft * as 173° at 

 760 mm., but 0.7304, its specific gravity at 20°, is sensibly lower than 

 it has been possible to reduce the decane from petroleum. Whether 

 this be due to the presence of a small amount of decanaphtene, which 

 appears to be nearly inert toward the methods of purification that 

 have been applied to these petroleum hydrocarbons, can only be deter- 

 mined in more extended experiments. In view of the ease in chlorina- 

 tiou of the hydrocarbons CJ^2n+2i ^^^ t,he difficulty in chlorinating the 

 naphtenes according to the experience of Markownikoff and Oglobine, 

 perhaps fractional chlorination should permit of the removal of decane, 

 and the naphtene would reveal its presence by analysis. As already 



* Ber. der deutsch. chem. Gesellsch., XV. 1695. 



