If the distillation tower is at a steady state, any change in feed composition does not require any change in the tower operating conditions.
| a) | True | |
| b) | False |
Change in load to the distillation tower refers to:
| a) | Change in cooling water inlet temperature | |
| b) | Change in reboiler hot oil composition | |
| c) | Higher condenser or reboiler duty | |
| d) | Change in feed flow to the distillation tower |
When flooding occurs, one of the necessary actions is to:
| a) | Increase the feed flow rate | |
| b) | Decrease the feed flow rate | |
| c) | Increase the reflux flow rate | |
| d) | Increase the reboiler duty |
Wrong
The correct answer is: Decrease the feed flow rate
When flooding occurs, one of the necessary actions is to:
| a) | Increase the feed flow rate | |
| b) | Decrease the feed flow rate | |
| c) | Increase the reflux flow rate | |
| d) | Increase the reboiler duty |
Wrong
The correct answer is: Decrease the feed flow rate
When flooding occurs, one of the necessary actions is to:
| a) | Increase the feed flow rate | |
| b) | Decrease the feed flow rate | |
| c) | Increase the reflux flow rate | |
| d) | Increase the reboiler duty |
Wrong
The correct answer is: Decrease the feed flow rate
The flooding condition can be identified by:
| b) | A higher pressure drop across the tower |
When the liquid throughput within the tower becomes very high, liquid buildup increases on each tray. This buildup eventually leads to the loss of cascading liquid from one tray to another. The vapor flow from one tray to another is also seriously impeded. This phenomenon is called:
flooding
| a) | Suppose the feed flow is increased and the tower is allowed to reach a new steady state condition. The resultant top product flow will increase and the bottom product flow will:
|
Wrong
The correct answer is: Increase
The flooding condition can be recognized by:
| a) | A significant reduction in product quality | |
| b) | A rapid increase in the reflux drum level | |
| c) | A rapid increase in the tower temperature | |
| d) | A significant decrease in tower differential pressure |
Wrong
The correct answer is: A significant reduction in product quality
The flooding condition can be identified by:
| a) | A rapid increase in the reflux drum level | |
| b) | A higher pressure drop across the tower | |
| c) | A rapid increase in the tower temperature | |
| d) | A significant drop in the tower pressure |
Wrong
The correct answer is: A higher pressure drop across the tower
The product compositions can be adjusted by changing the tower temperature or the reflux flow. When the tower temperature is increased, the vapor flow within the tower also increases. Thus, the purity of the bottom product:
| a) | Decreases | |
| b) | Increases | |
| c) | Stays the same |
When the heat input to the reboiler is increased, the tower temperatures:
| a) | Increase | |
| b) | Decrease | |
| c) | Do not change |
When the lighter fractions in the feed are increased, the level of the reflux drum:
| a) | Increases | |
| b) | Decreases | |
| c) | Does not change |
Consider an increase in the heavier fractions in the feed. As a result, the top product flow:
| a) | Decreases | |
| b) | Increases | |
| c) | Stays the same |
Wrong
The correct answer is: Decreases
When flooding occurs, one of the necessary actions is to:
| a) | Increase the feed flow rate | |
| b) | Decrease the feed flow rate | |
| c) | Increase the reflux flow rate | |
| d) | Increase the reboiler duty |
Suppose that you have to increase the purity of the top product. You must:
| a) | Decrease the reflux flow | |
| b) | Increase the reboiler duty | |
| c) | Increase the reflux flow |
Wrong
The correct answer is: Increase the reflux flow
When the tower temperature is reduced, the vapor flow within the tower decreases. As a result, the purity of the bottom product:
| a) | Decreases | |
| b) | Increases | |
| c) | Stays the same |
Wrong
The correct answer is: Decreases
When the tower temperature is reduced, the vapor flow within the tower decreases. As a result, the purity of the top product:
| a) | Decreases | |
| b) | Increases | |
| c) | Stays the same |
Wrong
The correct answer is: Increases
When the reflux flow is reduced, the tower temperatures:
| a) | Increase | |
| b) | Decrease | |
| c) | Do not change |
When the heat input to the reboiler is increased, the tower temperatures:
| a) | Increase | |
| b) | Decrease | |
| c) | Do not change |
Wrong
The correct answer is: Increase
Suppose that you have to increase the purity of the bottom product. You must:
| a) | Increase the reboiler duty | |
| b) | Decrease the reboiler duty | |
| c) | Increase the reflux flow |
Wrong
The correct answer is: Increase the reboiler duty
Suppose that you have to increase the purity of the top product. You must:
| a) | Decrease the reflux flow...........was your answer | |
| b) | Increase the reboiler duty | |
| c) | Increase the reflux flow...........is the correct answer |
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