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Mass Transfer

Q1: The solvent used in liquid extraction should not have high latent heat of vaporisation, because

A the pressure drop and hence the pumping cost will be very high.

B it cannot be recovered by distillation.

C its recovery cost by distillation may be prohibitatively high.

D it will decompose while recovering by distillation.

ANS:C - its recovery cost by distillation may be prohibitatively high.

The solvent used in liquid extraction should not have a high latent heat of vaporization because its recovery cost by distillation may be prohibitively high. When a solvent with a high latent heat of vaporization is used in liquid extraction, the energy required to vaporize and subsequently recover the solvent by distillation becomes significant. This can lead to higher operational costs due to increased energy consumption for distillation processes. Therefore, it is preferable to choose solvents with lower latent heats of vaporization to minimize the cost of solvent recovery by distillation.



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