Definition and core applications
Reactor
- Purpose: Used to carry out chemical reactions or physical transformations, such as chemical synthesis, catalytic reactions, polymerisation reactions, etc.
- Types: including chemical reactors, biological reactors, nuclear reactors, etc.
- Applicable fields: chemical, pharmaceutical, energy (such as petroleum refining, ammonia synthesis), and so on.
Fermenter
- Uses: Designed for microorganism or cell culture, used to produce biological products (e.g. alcohol, antibiotics, enzymes, yoghurt, etc.).
- Types: aerobic fermenter, anaerobic fermenter, solid state fermenter, etc.
- Applicable fields: bioengineering, food industry, biofuel production, etc.
Design differences
Reactor
- Structure: may be equipped with high pressure, high temperature or corrosion-resistant materials (e.g. stainless steel, titanium alloy), suitable for vigorous reaction conditions.
- Control parameters: focus on temperature, pressure, flow rate, catalyst efficiency, etc.
- Typical designs: Tubular reactors, kettle reactors, fluidised bed reactors, etc.
Fermenter
- Structure: Emphasis on aseptic environment, usually equipped with a sterilisation system (e.g. steam sterilisation), aeration (oxygen supply), stirring paddles (homogeneous mixing).
- Control parameters: pH, dissolved oxygen (DO), stirring speed, temperature and microbial metabolic state need to be strictly monitored.
- Typical designs: mechanically stirred fermenter, air-lift fermenter, membrane bioreactor, etc.
Operating conditions
Reactor
- Extreme conditions may be involved: high temperatures (hundreds of degrees Celsius), high pressures (e.g. 10-25 MPa for ammonia synthesis) or corrosive media.
- Reaction times are short and dominated by chemical kinetics.
Fermenter
- Usually operate under mild conditions: ambient or medium temperature (25-40°C), atmospheric pressure.
- Reaction times are longer (hours to days) and depend on microbial growth and metabolic cycles.
Biological activity requirements
Reactor
- Generally do not require biologically active components (unless they are bioreactors) and rely on chemical catalysts or physical conditions to drive the reaction.
Fermenter
- Rely on living microorganisms or cells, need to maintain metabolic activity, and avoid contamination (strict sterilisation and aseptic operation).
Types of products
Reactor
- Outputs are mostly simple compounds (e.g. ammonia, methanol) or polymers (e.g. plastics).
- Energy conversion may be involved (e.g. fuel cell reactors).
Fermenters
- Produces complex biomolecules: antibiotics (penicillin), organic acids (citric acid), enzymes, alcohols, etc. Also used in cell culture to produce vaccines or alcohols.
- May also be used for cell culture to produce vaccines or monoclonal antibodies.
Summary
| Characteristics | Reactor | Fermenter |
| Core Functions | Chemical/physical transformation | Microbiological/cell culture |
| Key controls | Temperature, pressure, catalyst | pH, dissolved oxygen, sterile environment |
| Biological activity | Usually not required | Required |
| Typical products | Chemicals, energy, materials | Biomolecules, food, pharmaceuticals |
| Extreme conditions | may involve high temperatures and pressures | Mostly mild conditions |