Controlled feed
Add a second reactant at the required process rate.
Glass Semi-Batch Reactors
Glass semi-batch reactors for gas–liquid reactions, controlled reagent addition and processes that continuously remove a reaction product.
UD Technologies · Vadodara, India
Controlled addition and removal
Combine batch containment with continuous process control.
A semi-batch reactor combines batch and continuous operation. One reactant is typically charged to the glass vessel while another is introduced gradually, or a product is removed continuously as the reaction proceeds.
This arrangement is particularly useful when the rate of addition affects heat release, selectivity or phase behaviour. In gas–liquid reactions, for example, gas can be bubbled continuously through a batch of liquid instead of charging an impractically large gas volume at once.
Gas–liquid duty
Bubble gas continuously through a liquid batch.
Selective reaction
Manage concentration to reduce unwanted side reactions.
Continuous removal
Withdraw gas, precipitate or separated product during reaction.
Salient features
Use feed and removal strategy to shape the reaction.
Semi-batch operation offers an additional control variable where a simple batch charge does not suit the chemistry.
Metered reagent addition
Introduce one reactant slowly to control concentration and reaction rate.
Gas sparging
Feed gas continuously through a charged liquid phase for effective contacting.
Side-reaction control
Limit instantaneous reactant concentration where selectivity is sensitive.
Product withdrawal
Remove gaseous, precipitated or phase-separated product as it forms.
Visible phase behaviour
Glass construction exposes bubbling, precipitation and liquid separation.
Custom thermal control
Jackets, agitation and controls can be matched to the heat-release profile.
Operating strategies
Configure the semi-batch sequence around the chemistry.
Feed, agitation, thermal control and product-removal arrangements are engineered for the required sequence.
Gas–liquid semi-batch reaction
Continuous gas feed into a liquid batch
Process arrangement
- Initial charge
- Liquid reactant or reaction medium
- Continuous input
- Gas introduced through the liquid phase
- Key control
- Gas flow, agitation and temperature
Controlled liquid addition
Metered addition of a second reactant
Process arrangement
- Initial charge
- First reactant and process medium
- Controlled input
- Second reactant added at a defined rate
- Objective
- Manage heat release, concentration or selectivity
Continuous product removal
Remove a product while retaining the reacting batch
Process arrangement
- Removal duty
- Gas, precipitated solid or separated liquid phase
- Objective
- Shift reaction behaviour or simplify downstream handling
- Observation
- Visible phase change through the glass vessel
Related system
Review the complete glass reactor range.
Compare semi-batch operation with jacketed batch, filter, cryogenic and reaction-distillation configurations.
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