HIGH TEMPERATURE CARBONIZATION OF COAL 413
In Gas. Vols. Hydrogen per Vol. Constituent. Total Hydrogen.
Per Cent. Per Cent.
Saturated Hydrocarbon Gases: Methane 22-68 2 45-36
Ethane 1-53 3 4-59
Propane ■31 4 1-24 51-19
Unsaturated Hydrocarbon Gases : 5-78
Ethylene 2-89 2
Propylene •29 3 •87
Butylene •05 4 •20
.Acetylene •10 1 •10
6-95
Vapours : 2-16
Benzene •72 3
Toluene •13 4 •52
Xylene •22 5 1-10
Naphthalene •01 4 •04
Hydrogen 37-73 — 3-82 37-73
Other gases 33-34 33-34
10000 133-03
The effect of the temperature of carbonization on hydrogen and the unsaturated and saturated hydrocarbons has been well illustrated by the figures given below which were obtained by A. H. Middleton 1 in connection with coke ovens.
Effect of Temperature on Hydrogen and Hydbocabbons
Temperature of distillation 400° C. 500° C. 600° C. 700° C. 800° C. 900° C.
Hydrogen in gas (per cent.) . 21-2 28-3 33-8 41-6 48-2 54-5
Saturated hydrocarbons (per cent.) . 60-1 56-2 50-7 45-0 39-1 34-2
Unsaturated hydrocarbons (per cent.) 6-3 5-8 5-0 4-4 3-8 3-5
The effect of one important influence—that of over-exliausting-—is admirably illustrated in the following table, in which. the make in neither case is particularly high, but which gives an excellent indication of th.e manner in which the additional 800 cubic feet of gas per ton is accounted for:—
1 Gas World (Coking Section), Ixxii, p. 15.