Used Parr 4551 | 1 Gallon T316 Stainless Steel High-Pressure Stirred Reactor

Parr Series 4500 / 4550 Floor Stand System | Pilot-Scale Process Scale-Up

• Manufacturer: Parr Instrument Company

• Model / Series: Model 4551 / Series 4550 Floor Stand Reactor

• Vessel Volume: 1 Gallon (Approx. 3.75 Liters)

• Reactor Head: 657HC, T316 Stainless Steel (S/N: 013085-522)

• Status: Used — Fully Inspected and Tested

Overview

Bridge the gap between small scale laboratory discovery and full scale manufacturing. The pre owned Parr Instruments Model 4551 is a heavy duty, 1-gallon stainless steel high pressure stirred reactor engineered for demanding chemical processing, polymer research, and advanced pilot plant workflows.

As part of the highly regarded Parr Series 4500 / 4550 floor stand family, this stirred reactor system extends your batch capacity to 3.75 liters, providing a vital middle ground for process validation and yield optimization. Sourced and evaluated by HiTechTrader, this system gives your facility immediate access to world-class high-pressure instrumentation without the standard 16–24 week OEM manufacturing lead times.

Condition & Unit-Specific Details

• Condition: Used — Fully inspected by HiTechTrader technicians to ensure excellent structural, mechanical, and sealing integrity.

• Wetted Metallurgy: Premium T316 Stainless Steel on both the reactor head and cylinder assembly for superior acid and solvent resistance.

• Reactor Head Markings: Model 657HC, T316 Stainless Steel, stamped 013085-522.

• System Configuration: Floor stand configuration with high-torque mechanical agitation.

• Controller Compatibility: This vessel system integrates seamlessly with standard laboratory reactor controllers, including the legacy analog Parr 4842 or modern digital Parr 4848 series.

• Warranty: Backed by HiTechTrader's standard 30-day limited warranty.

• Logistics Hub: Fully prepped, crated, and shipped directly from our main facility in Coatesville, Pennsylvania.

Master Technical Specifications

Core System Advantages

1 Gallon Pilot-Scale Capacity

When your process chemistry outgrows smaller Parr bench-top reactors, moving directly to production is a massive risk. The 1-gallon format provides the ideal scale for chemical process development, catalyst scale-up trials, and high-viscosity polymerization research, yielding enough final product for extensive analytical QC and formulation testing.

T316 Stainless Steel Metallurgy

Both the 657HC head and the heavy-walled pressure cylinder are machined from T316 Stainless Steel. The inclusion of molybdenum in T316 gives this system exceptional corrosion resistance against aggressive organic acids, halides, and solvents under extreme thermal cycling, significantly reducing the risk of metallic contamination in your batches.

Engineered for Multi-Phase Mixing

The stirred reactor architecture features a heavy-duty mechanical drive turning dual internal 6-blade impellers. High-intensity agitation maximizes gas-liquid mass transfer rates, provides uniform thermal distribution to prevent localized hot spots, and ensures consistent suspension in catalyst testing reactors.

Typical Applications

The Parr 4551 floor-stand platform is a critical asset across a broad spectrum of industrial and academic R&D sectors:

• Specialty Chemical Scale-Up: Validating reaction kinetics, yields, and exothermic behavior before moving to production lines.

• Polymer & Resin Research: Handling high-torque mixing profiles during complex polymerization sequences.

• Catalytic Hydrogenation: Running large-batch gas-liquid reactions under high hydrogen partial pressures.

• Pharmaceutical Process Development: Synthesizing larger multi-gram and kilogram pilot batches of active intermediates.

Nationwide Shipping & Availability

Waiting 4 to 6 months for custom OEM fabrication can stall critical product development timelines and grant your competitors an unearned market advantage. Operating out of our primary distribution hub in Coatesville, Pennsylvania, HiTechTrader specializes in rapid, secure, and professionally crated domestic freight and global export.

Whether your team is located in the Northeast pharmaceutical corridor, the Texas petrochemical region, or a West Coast technology incubator, we ensure your heavy-duty used high-pressure reactors arrive safely and ready for technical facility integration.

Frequently Asked Questions (FAQ)

What is a 1-gallon stirred high-pressure reactor?

A 1-gallon stirred high-pressure reactor is an industrial or pilot-scale pressure vessel designed to safely contain and perform chemical reactions under controlled pressure, temperature, and mechanical agitation. Heavy-duty stainless steel pressure reactors like the Parr 4551 are widely utilized in pharmaceutical scale-up, catalytic testing, chemical synthesis, and polymer research because they provide robust pressure containment (up to 1900 PSI), excellent T316 metallurgy, and uniform multi-phase mixing profiles required for scalable process development data.

How does a 1-gallon vessel compare operationally to smaller bench-top Parr reactors?

A 1-gallon floor stand system handles significantly larger thermal mass and requires high-wattage heating or cooling accessories. While smaller Parr 4560 Series reactors (such as the 300 mL 4561, 4562, or 600 mL 4568) are excellent for initial screening, the 4551 focuses strictly on scalability, mass transfer efficiency, and pilot scale process validation.

What types of seals are available for this used model?

Depending on your target chemistry, this Series 4550 reactor can be outfitted with a standard FKM O-ring (rated up to 225°C), an FFKM O-ring for advanced chemical resistance (up to 300°C), or a flat PTFE gasket for high-temperature workflows up to 350°C. Contact our team to verify the gasket configuration currently installed.

Can I integrate this with my existing laboratory infrastructure?

Yes. Parr systems are highly modular. The floor-stand profile is designed to align with standard pilot-plant utility hookups, gas manifolds, and external cooling fluid lines.

Sourcing Pre-Owned Parr Equipment from HiTechTrader

Parr Instrument Company autoclaves are globally renowned for their unmatched ruggedness and decades-long service life. Buying premium pre-owned Parr reactors through HiTechTrader allows your lab to acquire elite industrial assets at a fraction of capital cost.

Contact HiTechTrader today to:

• Request an official line-item quotation and current availability.

• Confirm exact configuration options (valves, dip tubes, thermowell, or cooling coils).

• Coordinate matching accessories or compatible used laboratory reactors.

• Arrange expedited domestic or international freight.

HiTechTrader | Coatesville, Pennsylvania | Est. 1982

Your premier destination for new, pre-owned, and fully inspected chemical synthesis equipment.