Parr Instrument Company Blog

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 avoid 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
Learn more!

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.

Learn more.

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.

Catalyst Loading Toolkit for Tubular Reactors

Catalyst Loading Toolkit for 5401 Tubular Reactor
Catalyst Loading Toolkit

Loading or removing a fixed bed (aka packed bed) of bulk solids such as powdered catalyst deep inside a long narrow tubular reactor at a precise repeatable depth can be challenging. Parr has created the Catalyst Loading Toolkit to facilitate loading of catalyst in the annulus of our tubular reactors and easily adjust the location and length of the catalyst packing.
Learn more. 

Reaction Calorimetry Capability Added to Parr Reactors

Parr 4540, 1.2 L Reactor, with H2 and liquid feeds, equipped for Power Compensation CalorimetryParr has integrated the principles and practice of reaction calorimetry into our reactor systems.

Reaction calorimetry is often used for studying chemical reaction rates and the thermal properties of systems. In chemical processing industries, this technique is used for understanding and mitigating hazards from the scale-up of reactions developed in the lab to industrial-scale reactors. As a reaction is scaled from lab to plant, scalability problems may emerge for various reasons. Issues are often attributable to a lack of understanding of the process chemistry, the inability to remove heat or changes in mixing performance during scale-up. Reaction calorimetry provides this additional level of process understanding.

The principal output from experiments performed in a reaction calorimeter is the heat production rate associated with the processes occurring inside the reactor. The heat production profile becomes the basis for the determination of a number of important operational parameters.

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Parr Custom Stirrers & Internals

Spiral Stirrer with Double Helix
Spiral Stirrer with Double Helix

Parr reactors and pressure vessels have been used in many industries for a wide variety of applications over our 120 year history. Parr has learned over the years that user requirements are always changing and we pride ourselves on building reactors and pressure vessels to fit each user’s needs. To meet this demand, Parr has become proficient at designing and manufacturing custom components.

ParrEd Episode 2: 1108 Oxygen Combustion Vessel 500 Firing Maintenance

The second video in our new ParrEd educational video series has been released! In the episode, Parr's Dr. Andrei Yermalayeu teaches how to perform the 500 Firings Maintenance for the 1108 Oxygen Combustion Vessel.

Find the new video on our ParrEd Playlist.

Subscribe to Parr’s YouTube channel today to receive notifications when new videos are added!

SpecView 3 Software Update for Parr 4848 & 4838 Controllers

The Parr 4848 Reactor Controller and 4838 Temperature Controller software has recently been updated with SpecView version 3 (SV3). This powerful software package has been updated with an improved interface and is packed with features.

Parr has offered SpecView version 2.5 for use with our 4848 and 4838 controllers for nearly a decade – it remains our best software package with superior data logging and well-designed user interface on a flexible user-customizable platform.

SV3 includes a streamlined installation process, addition of a ramp/soak screen, stop/run buttons, and a dedicated button for data file management. The new ramp and soak interface simplifies temperature programmability and offers a more transparent data logging scheme.

The software advancements made in SV3 will make control and data logging of your reactions even easier.

Learn more.