operating problems

(AODOP)
Formats: Interactive Web, CD-ROM

O V E R V I E W

This interactive training unit is designed to familiarize trainees with some of the problems that can occur during the operation of distillation systems. After completing this unit, trainees should be able to describe problems that can occur when the amount of reflux going back to the column is incorrect, and when the reboiler in a distillation system is operated improperly.

O B J E C T I V E S

Feed Problems

· Explain the role of the feed rate in maintaining column equilibrium.

· Identify problems that can occur when the feed rate is incorrect.

· Describe conditions that can lead to three operating problems: overloading, flooding, and puking.

· Describe some mechanical causes of overloading.

· Explain how to identify a flooded condition in a distillation tower.

· Explain how a liquid flood can be broken.

· Explain how flooding can be prevented or controlled.

· Identify process disturbances that can result from changes in the feed to a distillation tower.

· Identify problems that can show up during startup.

Reflux Problems

· Define reflux.

· Describe what can happen if the amount of reflux going back to the column is not correct.

· Identify typical disturbances that can occur in shell and tube condensers and fin-fan condensers.

Reboiler Problems

· Describe sources of heat input for a distillation tower.

· Explain the role of reboiler operation in maintaining column equilibrium.

· Identify problems that can occur when the reboiler is operated incorrectly.

· Identify typical disturbances that can occur in shell and tube reboilers and fired reboilers.

· Define overfractionation.

S U B J E C T S

Feed Problems

· Feed Control

· Overloading

· Other Problems

Reflux Problems

· Improper Reflux

· Condenser Problems

Reboiler Problems

· Reboiler Purpose

· Improper Operation

· Overfractionation