High pressure at the bottom of a distillation tower handling heat sensitive materials results in

Mass Transfer
High pressure at the bottom of a distillation tower handling heat sensitive materials results in

Increased relative volatility

Very efficient operation

Thermal decomposition of bottoms

Erosion of the tower

Increased relative volatility

Very efficient operation

Thermal decomposition of bottoms

Erosion of the tower

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Mass Transfer
Flooding results in

Good contact between the fluids

High gas velocity

High tray efficiency

Low tray efficiency

Good contact between the fluids

High gas velocity

High tray efficiency

Low tray efficiency

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Mass Transfer
In case of absorption & stripping, the interface of the liquid & gas phases are present in equilibrium, when the diffusional resistance of __________ is zero.

Interface

Liquid phase

All of these

Gas phase

Interface

Liquid phase

All of these

Gas phase

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Mass Transfer
If Rm is the minimum reflux ratio, the optimum reflux ratio may be around __________ Rm.

3 to 4

1.2 to 1.5

5

2.5 to 3

3 to 4

1.2 to 1.5

5

2.5 to 3

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Mass Transfer
Pick out the wrong statement pertaining to the rotary dryer.

Recommended peripherial speed of a rotary drier is in the range of 10 to 30 metres/minute

Flights (located in the inside shell of rotary dryer) lift the material being dried and shower it down through the current of hot air/gases. It extends from the wall to a distance which is about 8-12%

Rotary dryer is suitable for drying sticky material

Hold up of a rotary drier is defined as the fraction of the dryer volume occupied by the solid at any instant. The best performance for rotary drier is obtained, when the hold up is in the range of 0.

Recommended peripherial speed of a rotary drier is in the range of 10 to 30 metres/minute

Flights (located in the inside shell of rotary dryer) lift the material being dried and shower it down through the current of hot air/gases. It extends from the wall to a distance which is about 8-12%

Rotary dryer is suitable for drying sticky material

Hold up of a rotary drier is defined as the fraction of the dryer volume occupied by the solid at any instant. The best performance for rotary drier is obtained, when the hold up is in the range of 0.

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Mass Transfer
If mass diffusivity in a mixture is equal to the thermal diffusivity, then the Lewis number is

1

< 1

> 1

1

< 1

> 1

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Mass Transfer

Mass Transfer High pressure at the bottom of a distillation tower handling heat sensitive materials results in

Mass Transfer Flooding results in

Mass Transfer In case of absorption & stripping, the interface of the liquid & gas phases are present in equilibrium, when the diffusional resistance of __________ is zero.

Mass Transfer If Rm is the minimum reflux ratio, the optimum reflux ratio may be around __________ Rm.

Mass Transfer Pick out the wrong statement pertaining to the rotary dryer.

Mass Transfer If mass diffusivity in a mixture is equal to the thermal diffusivity, then the Lewis number is

Mass Transfer
High pressure at the bottom of a distillation tower handling heat sensitive materials results in

Mass Transfer
Flooding results in

Mass Transfer
In case of absorption & stripping, the interface of the liquid & gas phases are present in equilibrium, when the diffusional resistance of __________ is zero.

Mass Transfer
If Rm is the minimum reflux ratio, the optimum reflux ratio may be around __________ Rm.

Mass Transfer
Pick out the wrong statement pertaining to the rotary dryer.

Mass Transfer
If mass diffusivity in a mixture is equal to the thermal diffusivity, then the Lewis number is