Fractional Distillation of Kerosene. 497 



Tabular statement of the Constituents of Kerosene. 



Vapour-density. 



, A 



Label. Boiling-point. Found. Theory. Formula. 



A 77° C 



Az 87 



Aa 96-5 3-69 3-63 C P H r 



Ab 106 3-91 3-87 C 2 H^ 



B 116-5 4-08 4-11 Cgi H 1T 



Bb 127 4-36 4-35 C 9 ' H 18 



Be 138 4-59 4-59 C 9 i H 79 



C 148 4-84 4-84 C,* H 20 



D 158 5-02 5-08 Ci iH 21 



Dd 168 5-20 5-32 C n ~H 22 



De 176 5-51 5-56 CiijH.,, 



E 186 5-77 5-80 C 12 H Q4 



F 197 6-08 6-04 Gi2iR\. 



Ff 205 .... 6-28 C 13 H^ 



Gr ....... . 214 6-53 6-52 Ci 3 §H 27 



Gg 222 6-83 6-77 C u H 98 



H 230 



Hh 237 



I 246 



K 253 , . 



L 260 



M 267 



N 274 



O 280 



Z Residue — a dark coloured liquid (sp. gr. about 0*880 at 15 0, 5 C), 

 being a mixture of several liquids of very high boiling- 

 point. 



The series of liquids, A to O, presents the following cha- 

 racters. Each liquid, when distilled separately in the well- 

 known fractionation-flask, begins to distil about 10 degrees 

 higher than its predecessor begins to distil. Thus the first 

 term A begins to distil at 77°'5 ; the second term Az at 87° ; 

 the third term Aa at 96° ; the fourth term Ab at 105 o, 5 ; the 

 fifth term B at 116° ; the sixth term Bb at 127° ; the seventh 

 term Be at 138°, and so on up to the last term O. 



Except the few highest terms the members of the series 

 fulfil the requirement, viz. that half of the liquid shall distil 

 without the thermometer rising more than 2 or 3 degrees, 

 that three-quarters shall distil within 5 or 6 degrees of the 

 starting-point, and that by the time the boiling-point of the 

 next in the series is reached 90 per cent, shall have distilled 

 over. 



Within the last few weeks the seven lowest terms, viz. A 



