Types of Problems

  • Types of Problems: Problems encountered in process calculations are combination of the following categories:

    • Material balance

    • Energy balance

    • Without chemical reaction

    • With chemical reaction

    • Steady state

    • Unsteady state

  • Steady State Processes:

    • Parameters do not changes with time. This is the desired mode of operation for a majority of the processes in use today.

    • It optimizes production and minimizes costs for large commodity products when you have a stable feedstock.

  • Unsteady Processes—these are extremely important in the following situations:

    • Batch processes.

    • Start-up/shut down of continuous systems.

    • Continuous processes with changes in operating conditions or unplanned fluctuations due to control problems.