Choose a parallel pressure reactor based on the screening job, not just on the number of positions.
People choose multi-position pressure reactor because one reactor is too slow for catalyst screening, solvent screening, pressure screening, or hydrogenation screening. Parallel systems are used exactly for that purpose.
For more information abour pressure reactor types and selection logic, start with the high pressure reactor guide. If your work is specifically screening-focused, it also helps to read the parallel pressure reactor guide first.
Start with the screening goal
Screening work actually needs four things:
- compare catalysts
- compare pressure and temperature windows
- compare solvents or additives
- compare process settings before deeper process development
If the chemistry is still too unclear and every run needs heavy adjustment, a single pressure reactor may still be the better first tool.
Choose the number of positions by workflow, not by maximum count
How many useful comparisons does your workflow actually need in one cycle?
Current systems in the market show a wide range.
A practical rule:
- 2–4 positions often fit focused comparison work
- 6–8 positions fit faster screening and broader DoE-style studies
- too many positions can add cost and complexity without improving the actual decision speed
Check whether each position needs independent control
Some screening programs only need several reactors running under the same general condition. Other programs need different temperatures, different catalyst loads, or different operating profiles in each vessel. Not every platform gives the same degree of independence.
Hjchem parallel pressure reactor system uses independent temperature control and independent stirring for each reactor.
If the screening logic depends on independent control, confirm that early. Do not assume every multi-position unit works that way.
Match vessel size to screening purpose
Small vessels speed up screening, but they still need to represent the process well enough to make the data useful.
No matter how small of the vessel volume, there still need enough headspace, agitation quality, and sampling relevance for the chemistry.
A practical approach:
- use smaller vessels for faster catalyst ranking and condition comparison
- use larger screening vessels when gas-liquid contact, slurry behavior, or sampling realism matters more
- do not choose the smallest vessel if it weakens the value of the screening data for later scale-up
Check agitation before you check software
In pressure screening work, agitation affects gas-liquid contact, catalyst wetting, solids suspension, and temperature uniformity. Hjchem parallel system uses independent magnetic stirring and magnetic coupling stirrer in each reactor.
Before choosing a system, confirm:
- magnetic or other stirring arrangement
- speed range
- torque level
- whether the system is suitable for clean liquids only or also for slurry-like work
If the process needs stronger mixing, that should drive the hardware choice.
Hjchem Parallel Pressure Reactor Model Options
Hjchem parallel pressure reactors are available in three main configurations: Model A benchtop, Model B compact circular benchtop, and Model C floor-standing type.
All three models are designed for parallel laboratory experiments, controlled variable comparison, and reaction condition screening. The suitable model depends on the required number of positions, reactor volume, stirring method, layout preference, and customization level.
| Item | Model A Benchtop | Model B Compact Benchtop | Model C Floor-Standing |
|---|---|---|---|
| Structure | Integrated benchtop design | Compact circular benchtop design | Frame-type floor-standing design with casters |
| Layout advantage | Saves laboratory space while keeping flexible configuration | Surrounding circular layout for efficient space use | Movable frame structure, easier to position in lab or pilot area |
| Number of positions | 4 / 6 / 8 positions, customizable | Up to 6 positions | 4 / 6 / 8 positions, customizable |
| Reactor volume | 50 / 100 / 250 / 500 mL, customized volume available | 50 / 150 / 200 mL | 50 / 100 / 250 / 500 mL, customized volume available |
| Standard material | 316L stainless steel | 316L stainless steel | 316L stainless steel |
| Optional materials | Hastelloy, Monel, titanium, etc. | Hastelloy, Monel, titanium, etc. | Hastelloy, Monel, titanium, etc. |
| Operating temperature | 300°C, customizable | 200°C | 300°C, customizable |
| Design temperature | 350°C, customizable | 250°C | 350°C, customizable |
| Operating pressure | 10 MPa, customizable | 10 MPa | 10 MPa, customizable |
| Design pressure | 12.5 MPa, customizable | 12.5 MPa | 12.5 MPa, customizable |
| Sealing structure | Flange type / quick-open type / one-touch quick-open type | One-touch quick-open structure | Flange type / quick-open type / one-touch quick-open type |
| Stirring type | Magnetic stirring or mechanical stirring | Magnetic stirring only | Magnetic stirring or mechanical stirring |
| Heating method | Electric heating; jacket for oil-bath heating available | Electric heating | Electric heating; jacket for oil-bath heating available |
| Gas system | Centralized gas inlet/outlet available; each station can be customized | Centralized gas supply with pressure-reducing valve; each station can be independently shut off | Centralized gas inlet/outlet available; high-pressure feeding and other options can be customized |
| Optional functions | Process sampling, internal cooling coil, constant-pressure feeding, condensation reflux, recovery, customized ports | Compact gas supply and station shut-off design; port customization available | Process sampling, internal cooling coil, constant-pressure feeding, high-pressure feeding, condensation reflux, recovery, customized ports |
| Control method | PLC + touchscreen or computer control | PLC + touchscreen control | PLC + touchscreen or computer control |
| Data recording | Temperature, pressure, stirring speed, trend curves, data storage and export | Temperature and stirring speed, trend curves, data storage and export | Temperature, pressure, stirring speed, trend curves, data storage and export |
| Safety design | User-defined temperature/pressure limits, over-temperature and over-pressure alarm interlocks | User-defined temperature/pressure limits, over-temperature and over-pressure alarm interlocks | User-defined temperature/pressure limits, over-temperature and over-pressure alarm interlocks |
| Best suited for | Flexible benchtop catalyst screening, high-pressure synthesis, hydrogenation testing, and condition comparison | Compact small-volume screening where magnetic stirring is acceptable | Movable, more customizable high-pressure parallel reactor system for laboratory or pilot testing areas |
Model A is usually suitable for most benchtop parallel pressure reactor applications, especially when users need flexible volume, stirring, and optional process functions.
Model B is more compact and is suitable for small-volume screening with magnetic stirring.
Model C is better for users who need a movable floor-standing high pressure parallel reactor with stronger customization and more complete process options.
Do not treat gas handling as a minor option
A screening platform should manage gas properly.
That matters even more in hydrogenation, CO₂ screening, CO work, and other gas-liquid reactions.
Before choosing, check:
- gas type
- batch charging or controlled dosing
- whether gas uptake data matters
- whether pressure drop recording matters
- whether safe gas handling is built into the system
If the screening depends on gas behavior, gas handling is part of the core reactor specification, not an accessory.
Conclusion
Choose a parallel pressure reactor for screening when the lab needs faster, more reproducible comparison under pressure.
Do not choose it just because it has more vessels. Choose it because the workflow needs more comparison speed than a single reactor can provide.
The best system is the one that matches:
- the number of screening conditions
- the degree of independent control needed
- the gas and agitation demand
- the value of the data for later process development and scale-up
If you are selecting a parallel pressure reactor for screening, send us your reaction type, gas involvement, number of conditions to compare, working pressure, temperature, and target vessel size.
We can help suggest a suitable multi-position reactor setup for your lab.