498 



Fractional Distillation of Kerosene. 



to Be inclusive, have been prepared anew from fresh kero- 

 sene and fractionated with great perseverance. The first two 

 terms A and Az have not yet been procured in sufficient 

 quantity to admit of the very elaborate treatment to which 

 we should like to subject them, but the five next terms, Aa 

 to Be inclusive, have been obtained in abundance and have 

 been exhaustively treated. 



As an example we will quote the record of the final 

 testings of Aa : — 



Exp. I.— Vol. of Aa employed 



° c. 



136 cub. centira. 



At 96-2 

 97-2 

 98 

 99*2 

 105 



Exp. II.— 



°c. 



96 



97 



99 



105 



Exp. III.- 



95-8 



96-8 

 98-8 

 101 



5 cub. centim. had distilled. 

 50 



100 



retort dry. 



-Vol. of Aa, 132 cub. centim. 



5 cub. centim. had distilled. 

 50 „ ,, 



... 100 

 . ■ . . dry. 



—Vol. of x\a, 130 cub. centim. 



5 cub. centim. had distilled. 



• • 50 \, 



• • 100 

 . . dry. 



Showing that three-quarters of Aa distils over without a 

 greater rise than 3 degrees, and that the retort becomes dry 

 before the boiling-point of Ab is reached. 



Before making the three final distillations Aa had been 

 deprived of traces of Az (the next lower term) by the 

 following course of procedure. 



139 cub. centim. of Aa was placed in a retort and 50 cub. 

 centim. was then distilled off. Next the 50 cub. centim. of 

 distillate was redistilled thus : — 



94°'8 C. . . 5 cub. centim. 

 96 . . 16 „ 



Then the 16 cub. centim. of distillate was redistilled, 



94° . . 5 cub. centim. 



and 8 cub. centim. was distilled off and rejected. 



