Refers to a blend of two or more refrigerants that will not separate fractionate) and have different temperature and pressure characteristics than any of the separate ingredients.
A product resulting from the combination of two or three compounds that have identical vapour and liquid compositions. An azeotrope cannot be separated into its substituent parts by distillation. Azeotropes will fractionate slightly and experience temperature glide outside of the identified azeotropic points (ASHRAE std. 34 definitions), (See Appendix A).
A mixture of two or more compounds which has a constant boiling point. The composition of the vapour above the azeotropic mixture has the same relative concentrations of compounds as does the boiling liquid. Azeotropic mixtures cannot be separated by fractional distillation.