Why it takes more time to distill out water than toluene?

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vishnu

  • Jan 20th, 2012
 

Due to differences boiling point

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Ravi Prakash Mahendrakar

  • Mar 14th, 2012
 

Distillation is separation by component based on VAPOR PRESSURE AND NOT BOILING POINT.

Vapor pressure of toluene is much higher than water, and so it take longer hours to distill water than toluene.

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MANISHA

  • May 15th, 2012
 

Boiling point of toluene is greater than that of water, so water should distill first, not toluene.

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vinod Meshram

  • May 19th, 2012
 

water have more latent heat of vaporization than toluene....for same heat load...

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swati

  • May 21st, 2012
 

water has lower boiling point(100deg) than toluene(110). one which has lower boiling point has also higher volatility and hence water can be easily separated using distillation.

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Jenish Patel

  • May 22nd, 2012
 

Please be specific. water individually can not distill. From which solvent you want water to be distilled?

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priyasharay

  • Jun 8th, 2012
 

b.p of water is 100C b.p of toluene is 110C , they will form azetropes , so i would go for azetropic distillation or maybe extraction

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rajeev

  • Jul 26th, 2012
 

in case of azeotrope only alternative is through azeotropic distillation ... extractive distillation s used when relative volatility is close to 1 and no of tray reqd r high

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Vipin Agrawal

  • Nov 28th, 2014
 

And if boiling temperature is high then vapor pressure is also high for a component. Both things (boiling point and vapor pressure) are correlated by antoins equation.

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Ravi Prakash Mahendrakar

  • Oct 14th, 2016
 

If your objective is to separate water and toluene, the best thing you do is go for Extraction. (Separation of components based on density). Water and toluene are immiscible and differ in density, so can be easily separable.

Here comes Answer to your question:
Distillation is separation of components based on vapor pressure.
Though water has lower boiling point (100 C) than toluene (110 C), water has very high latent heat of vaporization.
Latent heat of vaporization of Toluene is 351 kJ/kg
Latent heat of vaporization water is 2265 kJ/kg.

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Priyanka

  • Apr 21st, 2017
 

Due to Hydrogen bonding in water

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Pritam Jadhav

  • May 4th, 2017
 

Because the boiling point of water is higher than toluene.
Thus toluene is more volatile liquid, therefore it comes out first.

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vikas

  • Jul 9th, 2017
 

Because distillation depends on volatility of component and toluene is a more volatile than water.

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