Related Questions

The distillation carried out in such a way that the liquid with the lowest boiling point is first evaporated and re-condensed, then the liquid with the next higher boiling point is then evaporated and re-condensed, and so on until all the available liquid fuels are separately recovered in the sequence of their boiling points. Such a process is called
A Cracking
B Fractional distillation
C Full distillation
D Carbonisation
Steam distillation is used for separation of high boiling
A Substances from non-volatile impurities
B Volatile impurity from still higher boiling substances
C Both A & B
D Neither A nor B
Components, having widely different boiling point in a binary mixture, can be separated using __________ distillation.
A Molecular
B Extractive
C Steam
D Simple
Higher boiling fractions like atmospheric residue is distilled under vacuum at low temperature because at high temperature, there is a tendency of the predominance of
A Thermal cracking
B Gum formation
C Coking
D Discoloration
__________ is used as an 'entrainer' for the separation of acetic acid-water mixture by distillation.
A Furfural
B Benzol
C Butyl acetate
D Hexane
High pressure at the bottom of a distillation tower handling heat sensitive materials results in
A Thermal decomposition of bottoms
B Increased relative volatility
C Erosion of the tower
D Very efficient operation
Boiling point elevation for a strong and concentrated solution is found by Duhring's rule, which states that at the same pressure, the boiling point of a solution is a linear function of the __________ of pure water.
A Boiling point
B Dynamic viscosity
C Kinematic viscosity
D Density
An aqueous solution of methanol is to be distilled in a tray column. High pressure steam is available as a source of heat. For a given reflux ratio and overhead composition, two options are being explored; (i) a reboiler is used and (ii) no reboiler is used but steam is fed directly to the bottom of the column. As compared to option (i), in option (ii)
A Less number of trays are required
B Composition of the residue remains unchanged
C More number of trays are required but the residue composition remains unchanged
D More number of trays are required and the residue composition is more dilute in methanol
Heat sensitive materials with very high latent heat of vaporisation may be economically separated using
A Liquid extraction
B Distillation
C Evaporation
D Absorption
In spite of large heat transfer co-efficients in boiling liquids, fins are used advantageously, where the entire surface is exposed to __________ boiling.
A Film
B Nucleate
C Transition
D All of the above

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