Parr Instrument Company Blog

Standard vs. Custom Multiple Reactor Systems

Parr Instrument Company designs and builds both standard and custom parallel & multiple reactor systems for use in many industrial and academic laboratories for any number of processes that require elevated temperature and pressure.

Our standard systems include the popular Series 5000 Multiple Reactor System with six 45 mL or 75 mL reactors and our new Series 2500 Micro Batch System with three 5 mL or 10 mL vessel sizes. Any of our stirred reactor series can be combined in parallel to create custom parallel reactor systems.

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Four Station Multiple Reactor
Four Station Multiple Reactor

Parr Fluidized Bed Reactors for Solids Processing

Fluidized Bed ReactorThere are many applications and configurations for which fluidized bed reactors have been successfully deployed in industry. The core element of a fluidized bed is the upward flow of a fluid (usually gas) through a bed of solids at a high enough flow rate to suspend or fluidize the particles in the fluid but not so high that they are transported out of the reactor. This leads to increased interaction between solids and fluid and decreased interaction of solids with each other and the wall. It also makes it easier to recover and/or recycle the bulk solids from the reactor.

These characteristics give fluidized bed reactor systems advantages over other types of reactors for some applications, despite the increase in complexity compared to fixed bed reactors.

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Parr Oxygen Combustion Bomb Calorimeter Selection


There are a number of factors that can influence your choice for oxygen combustion bomb calorimetry. Precision, workload, and type of analysis will all make a difference in choosing the best model for your research needs.

We explain these factors and more in our newly updated Technical Note No. 105: Calorimeter Selection Guide. Download Parr’s Calorimeter Selection Guide (must be registered/logged in to access) to learn more or contact us for personalized help in selecting your calorimeter!

New Automated Liquid Sampler Video

Check out our new video featuring our 4878 Automated Liquid Sampler!

Collect multiple samples at user-defined intervals from any Parr reactor or pressure vessel while at operating temperature and pressures up to 5,000 psi and 500 ˚C.

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New HP/HT Rotating Cylinder Electrode System

Parr's new High Pressure, High Temperature Rotating Cylinder Electrode (RCE) System was designed to perform corrosion studies as described in ASTM G185 at elevated pressure and temperature. This apparatus facilitates the evaluation of corrosion inhibitors in harsh, real world conditions, up to 200bar/2900psi and 200°C, with or without the presence of CO2 and/or H2S.
Parr’s new system is based on its popular 1 liter stirred reactor design and integrates robust counter and reference electrodes from Corr Instruments with dedicated sequencing software to control Gamry’s 1010B Potentiostat as well as Parr’s temperature and motor controller.

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Parr HP/HT RCE System
Parr HP/HT RCE System

Hydrometallurgical Applications: Acid and Caustic Leaching of Ores

Parr stirred reactors are widely used in hydrometallurgical applications where acid leaching of ores is the preferred method to extract metal ions. A widespread example of this technology is the acid leaching of nickel ions from laterite ores, a first step in the path to the production of stainless steel.
To minimize vessel corrosion by the aggressive sulfuric and hydrochloric acids used in this process, vessels are most commonly constructed of titanium.
However, not all extractions are done with acids. Aluminum, for example, is extracted from bauxite ores with the use of caustic solutions where the preferred material of construction for the vessel is Inconel or Monel.
To learn more about the use of Parr pressure vessels for acid or caustic leaching of metallic ores, please see

Parr Reactors now available with Hydrogen Generator

Parr reactors are commonly used for hydrogenation applications. In some situations, the use of hydrogen tanks may not be feasible. Parr systems are now available with the H-Genie® Hydrogen Generator as a solution to eliminate the need for hydrogen cylinders.

Catalyst Testing System
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Low Pressure Hydrogenation System
Hydrogenation Scale-Up System

Parr Reactor Fittings Video

In this short video we identify the standard head fittings available for Parr’s stirred reactors and discuss custom options available.

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See more with Parr Reactors!

We’ve listened to you! In response to a number of customer requests, Parr is pleased to offer larger windows installed in our pressure vessels for use at high pressure. Our new 1” viewable round windows can be rated up to 1000psi/69bar at 225°C or 1500psi/103bar @ 25°C. Now you can see more of what is happening inside our pressure vessels.

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Parr Reactors Overview Video

This new video provides a quick overview of the breadth of Parr's Reactor and Pressure Vessel product lines. Learn about:

  • vessel size range
  • support stands options
  • fixed and moveable heads
  • and more!

Learn more about Parr Reactors and Pressure Vessels.