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FRACTIONAL DISTILLATION
A mixture of two or more volatile liquids can be separated by fractional distillation. When their boiling points differ by more than 400C ,then the operation can be carried with the help of simple distillation apparatus .The more volatile liquid passes over first and is collected in a receiver .When the temperature begins to rise for the second time,
the first receiver is disconnected .A new receiver is attached as soon as the temperature becomes constant once again .Thus the distillate is collected in fractions and the process is termed as fractional distillation .
 The use of fractionating column has found a remarkable application in modern chemistry ,especially ,in the distillation of petroleum ,coal-tar and crude alcohol .


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