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Batch Reactors

Type of Reactor Characteristics

Simple Batch Reactor is charged via two holes in the top of the tank; whilereaction is carried out, nothing else is put in or taken out until thereaction is done; tank easily heated or cooled by jacket

Kinds ofPhases Present

Usage Advantages Disadvantages

1. Gas phase

2. Liquid phase

3. Liquid Solid

1. Small scaleproduction

2. Intermediateor one shotproduction

3.Pharmaceutical

4. Fermentation

1. Highconversion perunit volume forone pass

2. Flexibility ofoperation­samereactor canproduce oneproduct onetime and adifferentproduct thenext

3. Easy to clean

1. Highoperating cost

2. Productquality morevariable thanwithcontinuousoperation

General Mole Balance Equation

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Assumptions

1) No inflow or out flow FA0 = FA = 0

2) Well mixed

Constant volume V = V0 (e.g. Liquid Phase or Gas Phase in a steel container)

In terms of conversion

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The reaction time necessary to reach a conversions X in a batch reactor is

. The following table gives reaction times for first (rA = kCA) and second (rA = k

) in a batch reactor

The following table gives the various times necessary to process one complete batch.

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Examples:

Batch Reactor Times

Batch Reactors with a Gas Reaction

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