I can only find info on sec-butanol (aka butan-2-ol) and ethanol. I need to know whether isobutanol forms an azeotrope with ethanol. Can you direct me to a legitimate info source too, please?

  • 1
    $\begingroup$ sciencedirect.com/science/article/pii/037838129180013L $\endgroup$
    – Curt F.
    Jul 7, 2016 at 11:44
  • $\begingroup$ From PubChem, 2 butanol is soluble in water, very soluble in acetone and miscible in ethanol and ethyl ether. If acetone is not a problem you can dissolve in a little acetone then add to ethanol. $\endgroup$
    – porphyrin
    Jul 7, 2016 at 17:13
  • $\begingroup$ Unlikely. Compounds with similar polarity/chemical structure do not form aceotropes with each other. en.wikipedia.org/wiki/Azeotrope#Mechanism $\endgroup$
    – Karl
    Jul 8, 2016 at 10:09
  • $\begingroup$ I've come to the conclusion the EtOH and iBuOH are miscible and will therefore not form an azeotrope based on the info provided here and elsewhere. $\endgroup$
    – RedWold321
    Jul 20, 2016 at 21:06
  • $\begingroup$ That's a non sequitur. Compounds may be miscible and still form an azeotrope, like water and ethanol do. $\endgroup$ Mar 1, 2017 at 6:30

1 Answer 1


According to the Merck Index${^{[1]}}$

isobutanol is miscible with ethanol

1) O'Neil, M.J. (ed.). The Merck Index - An Encyclopedia of Chemicals, Drugs, and Biologicals. Cambridge, UK: Royal Society of Chemistry, 2013., p. 953


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