What are the disadvantages of bubble caps in a distillation column?

Answer 1

• Bubble cap trays are used primarily where large turndown ratios are required. Turndown ratio is the range of higest to the lowest flow rates.

• Their construction allows very low liquid rates to be handled with little or no leakage.

• Due to their ability to operate at low vapor and liquid rates, bubble cap trays are used in a significant portion of fractionation tray installations.

Answer 2

1.high entrainment

2.expensive

3.poor "turn down performance:

4.pressure drop is maximum

5.require high tray spacing

6.problem with cooking,highly fouling mixture

Answer 3

Some disadvantages of bubble caps in a distillation column include potential for fouling or clogging, higher pressure drop compared to other types of trays, and limited turndown ratio. Additionally, they can be more expensive to manufacture and maintain than simpler designs like sieve trays.

Answer 4

They keep vapour in the chamber so that it can be condensed and extracted.