Chpt 1 Introduction

Chpt 1 Introduction

1. Process

   • chemical reaction that produces a product

2. Process Control

   • controlling the process manually or automatically so that the output is within desired range
   • manual control
     • requires continuous monitoring and corrective actions whenever a variable deviates from desired value
     • different operators make different decisions about how to correct the deviation, resulting in a less than perfect operation
     • in most process plant, there are hundred of variables that must be maintained at some desired values >>> manual correction require large number of operators
   • automatic control
     • reduces human errors
     • improves efficiency
     • cut costs