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From the Rolls-Royce experimental archive: a quarter of a million communications from Rolls-Royce, 1906 to 1960's. Documents from the Sir Henry Royce Memorial Foundation (SHRMF).
Laboratory analysis report of a petrol sample detailing distillation results and chemical composition.

Identifier  ExFiles\Box 20\6\  Scan078
Date  20th May 1925
  
X.985
H13/EA20.5.25.
Laboratory.
c to Hs.{Lord Ernest Hives - Chair}

Re Sample of Petrol Submitted for
analysis by the Expt.Dept. today.

Specific Gravity 0.790

Distillation:-
Initial Boiling Point -------- 39°C
Final Boiling Point --------- 216°C
Total Distillate ------------ 97.5%
Residue --------------------- 1.0%
Loss ------------------------ 1.5%

Temperature °C % Distillate.
75 4.0
85 17.0
95 39.5
105 55.5
115 66.5
125 72.0
135 76.5
145 80.5
155 85.0
165 88.0
175 90.5
185 93.5
195 95.0
205 96.0
215 97.0

Analysis.
Olefines & Di-olefines ------ 22.4 %
Aromatic Hydrocarbons ------ 46.8 %
Paraffins & Cycloparaffins -- 30.8 %

The boiling range is very extended and there is a large proportion of high boiling point constituents.
Benzene is the chief aromatic constituent, Toluene and Xylene being practically absent.
The Olefines and Di-olefines are exceptionally high at the expense of the paraffins.
The specific gravity is also exceptionally high.

Hl. HE
  
  


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