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.
a liquid mixture of two or more components which has a unique constant boiling point
a liquid mixture that exhibits a maximum or minimum boiling point relative to the boiling points of surrounding mixture compositions
a liquid mixture which when vaporised, produces the same composition as the liquid
a liquid mixture whose vapor has the same composition as the liquid
a mixture of two chemicals that forms a third substance with its own unique chemical properties
a mixture of two or more liquids that has a constant boiling point at a specific concentration
a mixture with a fixed boiling point that cannot be further separated by fractional distillation
a liquid mixture of two or more substances that boils at constant temperature. The mixture cannot be separated by normal distillation, but can be redistilled and reused in its azeotropic form.
A blend consisting of one or more refrigerants of different volatilities that does not appreciably change in composition or temperature as it evaporates (boils) or condenses (liquefies) under constant pressure (compare with zeotrope). Refrigerant blends assigned R-500 series number designations by ANSI/ASHRAE 34 are azeotropes.
A mixture of chemicals is azeotropic if the vapor composition is identical to that of the liquid phase. This means that the distillate of an azeotrope is theoretically identical to the solvents from which it is distilled. In practice, the presence of contaminants in the solvent slightly upsets the azeotropy.
azeotropic mixture; azeotropy. A solution that does not change composition when distilled. For example, if a 95% (w/w) ethanol solution in water is boilled, the vapor produced also is 95% ethanol- and it is not possible to obtain higher percentages of ethanol by distillation.
A mixture whose evolved vapour composition is the same as the liquid it comes from. This phenomenon occurs at one fixed composition for a given system. At either side of the azeotropic point, the vapours will have different compositions from that of the liquid they evolved from. Such mixtures act as pure substances in distillation and thus are inseparable by standard distillation methods. Azeotropic distillation is necessary to separate such a mixture.
A liquid mixture that distills without change in composition and characterized by a constant minimum or maximum boiling point which is lower or higher than any of the components.
a specific mixture of components, which at a given pressure cannot be separated by distillation, i.e. the liquid and vapour phases have the same compositions.
Having constant maximum and minimum boiling points.
An azeotrope is a special homogenous mixture of 2 or more compounds (molecules). The ratio of the compounds, say in an azeotrope consisting of two compounds X and Y, is exactly the same in both the vapour form of the mixture, X:Y as in the liquid phase.