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. 2012 Mar 3;69(16):2671–2690. doi: 10.1007/s00018-012-0945-1

Table 3.

Comparison of butanol isomers [49]

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n-butanol sec-butanol Isobutanol tert-butanol
Research octane number (RON) 96 101 113 105
Motor octane number (MON) 78 32 94 89
Melting temperature (°C) −89.5 −114.7 −108 25.7
Boiling temperature (°C) 117.7 99.5 108 82.4
Enthalpy of vaporization at Tboil (kJ/kg) 582 551 566 527