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Explain me about the term Azeotropes ..What are its types.. everything..
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Answers
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The most common example is the azeotrope between water and ethanol (grain alcohol). Water boils at 100 ºC and ethanol boils at 78.3 ºC. The mixture will boil at 78.2 ºC and have a composition of 95% ethanol and 5% water by volume.
What are. Azeotrope?
An azeotrope is a mixture of liquids that maintains its composition and boiling point during distillation. It is also known as an azeotropic mixture or constant boiling point mixture. Azeotropy occurs when a mixture is boiled to produce a vapor that has the same composition as the liquid
Answer:
An azeotrope is a mixture of liquids that maintains its composition and boiling point during distillation. It is also known as an azeotropic mixture or constant boiling point mixture. Azeotropy occurs when a mixture is boiled to produce a vapor that has the same composition as the liquid. The term is derived by combining the prefix "a," meaning "no," and the Greek words for boiling and turning. The word was coined by John Wade and Richard William Merriman in 1911.
Types of Azeotropes
Azeotropes may be categorized according to their number of constituents, miscibility, or boiling points:
Number of Constituents: If an azeotrope consists of two liquids, it is known as a binary azeotrope. An azeotrope consisting of three liquids is a ternary azeotropes. There are also azeotropes made of more than three constituents.
Heterogeneous or Homogeneous: Homogeneous azeotropes consist of liquids that are miscible. They form a solution. Heterogeneous azeotropes are incompletely miscible and form two liquid phases.
Azeotrope Separation
Since fractional distillation cannot be used to separate components of an azeotrope, other methods must be employed:
- Pressure swing distillation applies pressure changes to change the composition of a mixture to enrich the distillate with the desired component.
- Another technique involves the addition of an entrainer, a substance that alters the volatility of one of the azeotrope components. In some cases, the entrainer reacts with a component to form a nonvolatile compound. Distillation using an entrainer is called azeotropic distillation.
- Pervaporation involves separating components using a membrane that is more permeable to one constituent than the other. Vapor permeation is a related technique, using a membrane more permeable to the vapor phase of one component than another.