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February 17, 1940


JAMA. 1940;114(7):553-557. doi:10.1001/jama.1940.02810070019004

In order to dispel any confusion concerning the present status of benzene, it is necessary to have a very definite differentiation between benzene and benzine.

Benzene (benzol C6H6)1 is a single chemical substance obtained by distillation of coal tar and is purified by redistillation at from 70 to 80 C. Gasoline, or benzine,2 is obtained from the distillation of petroleum and is a mechanical mixture of hydrocarbons ranging from C5H12 to C6H14. Its composition varies according to the boiling point. At 36.3 C. it contains from 60 to 70 per cent of pentane, C5H12. Substances distilling between 30 and 70 C. produce what is commonly called gasoline.

Benzene is obtainable in several grades in commerce:

  1. Benzene: Chemically pure (U. S. P. XI, p. 85) 95 cc. distils between 79.5 and 81 C.

  2. Benzene 90