Stationary State

A stationary status doesn't change in space and/or time. Nevertheless you have to discriminate the following statements:

• 'the reactor operates stationary' (for continuous reactors!) means that it works hydrodynamically, thermal and chemically in a constant status (it is not in a start up, disturbed or shut down phase)
• 'the reactor is stationary in space and time' means that the concentrations within the reactor are constant over the time and within the reactor volume, that is equivalent to an ideal CSTR, - it is totally back-mixed!
• 'the reactor is not stationary in both space and time' means that the concentrations within the reactor are either not constant in space or not constant over time, that is equivalent to either an ideal TFR or an ideal STR, - they are (totally) not back-mixed.

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