Each sample is separate with its own temperature sensor and controller. Thus, temperatures can be independently set and controlled with a temperature range of over 100º C at any time.
To achieve temperatures below ambient, chilled fluid must be added which lowers the operating.
Our systems are fitted individual magnets and stirrer motors under each zone. Additionally, it is possible to stir with overhead motors, normally only necessary for more viscous chemicals.
Traditional stirring with magnetic bars (fleas) is possible in all PolyBLOCK’s, especially when small vessels or vials are used.
Good mixing of liquids and suspensions is possible using “suspended” stirrers, especially with larger vessels on the 4 position PolyBLOCK unit.
This is available as an option.
High-Pressure Reactors are most commonly 16 mL in but this is now interchangeable with 30 and 50ml reactors, all stirred and with separate temperature control. For larger volumes, up to 400 mL, bigger modifications are needed. All feature efficient magnetic stirring the following being typical choices:
16 mL Vessels available across the range, but specifically designed for chemistry screening on the HPCS unit. Each vessel is supplied with a multi-port lid and a central thermowell. The thermowell can be used to support suspended stirrers (PTFE, stainless, or Hastelloy) in order to improve mixing.
The small size is ideal for reducing chemical inventories for screening runs, and provide excellent data for selecting the chemical systems to proceed to larger-scale testing.
Larger vessels ideal for High-Pressure Optimisation.
Reliable & scalable results can be obtained using suspended mechanical agitation. Suspended agitation provides a low-cost option without the chance of leaks. Where overhead motors are needed, the vessels can be supplied with magnetic rotating seals and conventional drives (75ml vessel not available with overhead agitation). This application can be extended by the inclusion of pressure measurement and control.
The multi reactor platforms, High-Pressure PolyBLOCK, High-Pressure ChemSCAN II, High-Pressure AutoMATE, also accommodate HEL’s range of CATalyst screening system. These essentially manual multi-sample screening vessels have been designed to provide a simple easy-to-use tool for high-pressure reaction screening. They can be used directly in the zones of any HEL 4-pot reaction platforms, or on stirring hotplates and oil baths.
Is designed to be used with 18 standard 2ml HPLC vials (with our without septa in place)
Is a simple device that allows the use of 24 open-top vials to be used at high pressure and temperature. Typical test volume is around 1ml. The vessels are refluxed with cold fingers that minimise solvent loss and cross-contamination.
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