Series 5500 HP Compact Reactors, 25-600 mL

The 5500 series of high pressure, compact, laboratory reactors ...

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Reactors and Pressure Vessels


The 5500 series of high pressure, compact, laboratory reactors is based on the popular mini and micro reactor series. Compared to the mini and micro reactors, these compact reactors have a smaller and more compact magnetic stirrer and therefore a lower, but easily controllable motor speed.

Familiar Parr Designs

All of the safety, convenience and reliability features which have been the hallmark of Parr pressure reaction equipment for more than 50 years have been incorporated into a new line of high pressure, compact laboratory reactors. (HPCL – reactors.)

The Series 5500 HPCL Reactors are based upon our popular micro and mini, Series 4590 & 4560 Reactors. There are several differences between these new reactors and their original counterparts. Primarily, these are:

  • A smaller, more compact magnetic drive is installed.
  • A smaller, more compact variable speed stirrer motor.
  • The larger support stand, overarm and motor have been eliminated.
  • An Aluminum Block Heater also serves as the support stand.

As a result of these changes, we are now able to offer these new reactors to users who do not require the wide variety of options and expandability provided by our Series 4500 Reactors at a significantly lower cost. These new designs will be welcomed by not only scientists with limited space or budgets, but also by scientists building multiple reactor installations for combinatorial chemistry or high throughput investigations.

The reaction vessels used in these new HPCL reactors are identical to the ones furnished in the Series 4590 Micro and Series 4560 Mini Reactors and use the popular Parr split ring closure. These vessels are rated for a maximum working pressure of 3000 psi. The maximum operating temperature is dependent upon the seal selected, PTFE gasket for up to 350 °C; with FKM O-ring to 225 °C or FFKM O-ring to 275 °C.

The 25, 50, and 100 mL reactors are equipped with gas inlet and outlet valves, a liquid sampling valve, pressure gage, safety rupture disc, and internal thermocouple in addition to the internal stirrer. The 300, 450, and 600 mL reactors provide an optional internal cooling loop in addition to these fittings. In addition to the standard Type 316 Stainless Steel, the vessels for these new HPCL Reactors can also be constructed from any of the standard Parr materials of construction.

These vessels are designed, built and can be certified to the ASME Pressure Vessel Code, European Community P.E.D. and other appropriate local codes. Electrical safety is certified by CSA and the EC-CE mark.

New Magnetic Drive

To take advantage of the new technology available in magnets today, Parr has designed a new compact, magnetically-coupled stirrer drive especially for these smaller vessels. Tests show that this new drive is sufficient to stir reaction mixtures with viscosities up to 10,000 centipoise in a 600 mL reaction vessel

Variable Speed Motor

A 1/17 hp variable speed motor provides stirring speeds adjustable from 0 to 1700 rpm. An optional tachometer pickup provides a signal to the optional tachometer display module which can be installed in the 4848 Controller.

New Heater / Reactor Support

A new heater that also serves as the vessel support has been designed for the HPCL Reactors. This is an aluminum block style heater for excellent thermal uniformity. The cartridge heaters used in this heating block are easily replaced if required. A stainless steel heat shield is provided around the heating block. This style of heater/reactor support provides a very small footprint, ideal for limited bench space.

Model 4848 Temperature Controller

The Series 4848 Controller used with the standard Parr line of medium and high pressure reactors is also furnished for use with these reactors. The 4848 offers the user options for redundant temperature sensor and alarm, digital pressure readout, stirring speed display or control, motor load, and bi-directional digital communication (RS-485).

Alternate Controllers Available

A single 4871 Process Controller can control up to eight High Pressure, Compact Laboratory Reactors.


As shown in the ordering guide, a variety of options are available for these Series 5500 Reactors. In addition to the options described here, there are a number of additional accessories such as glass or PTFE liners, special stirrers, gages, gas and liquid feed systems, custom valves, etc., as described in the Options Section of the Parr Website.

Please remember that the Series 5500 Reactors have been designed and packaged to provide the basic functions of these small laboratory reactors and not all of the options available for the more versatile Series 4500 Reactors can be incorporated into these units. Investigators who need explosion proof operation, jacketed vessels, bottom drain valves, high torque stirrers, catalyst baskets, etc., will need to start with a Series 4590 Micro Reactor or a Series 4560 Mini Reactor.

150 150 Series 5500 HP Compact Reactors, 25-600 mL 2022-01-05