Bancroft point
Encyclopedia
A Bancroft point is the temperature where an azeotrope
occurs in a binary system
. Although vapor liquid
azeotropy is impossible for binary systems which are rigorously described by Raoult's law, for real systems, azeotropy is inevitable at temperatures where the saturation vapor pressure
of the components are equal. Such a temperature is called a Bancroft point. However, not all binary systems exhibit such a point. Also, a Bancroft point must lie in the valid temperature ranges of the Antoine equation.
Bancroft point is named after Wilder Dwight Bancroft
.
Azeotrope
An azeotrope is a mixture of two or more liquids in such a ratio that its composition cannot be changed by simple distillation. This occurs because, when an azeotrope is boiled, the resulting vapor has the same ratio of constituents as the original mixture....
occurs in a binary system
Mixture
In chemistry, a mixture is a material system made up by two or more different substances which are mixed together but are not combined chemically...
. Although vapor liquid
Vapor-liquid equilibrium
Vapor–liquid equilibrium is a condition where a liquid and its vapor are in equilibrium with each other, a condition or state where the rate of evaporation equals the rate of condensation on a molecular level such that there is no net vapor-liquid interconversion...
azeotropy is impossible for binary systems which are rigorously described by Raoult's law, for real systems, azeotropy is inevitable at temperatures where the saturation vapor pressure
Vapor pressure
Vapor pressure or equilibrium vapor pressure is the pressure of a vapor in thermodynamic equilibrium with its condensed phases in a closed system. All liquids have a tendency to evaporate, and some solids can sublimate into a gaseous form...
of the components are equal. Such a temperature is called a Bancroft point. However, not all binary systems exhibit such a point. Also, a Bancroft point must lie in the valid temperature ranges of the Antoine equation.
Bancroft point is named after Wilder Dwight Bancroft
Wilder Dwight Bancroft
Wilder Dwight Bancroft was an American physical chemist.Born in Middletown, Rhode Island, he received a B.A. from Harvard University in 1888, a Ph.D. from University of Leipzig in 1892, and honorary SCDs from Lafayette College and Cambridge University...
.