ROT-X-TRACT-L Liquid/Liquid Extraction System Model 13308 Instruction Manual

Importance of the Topic

Liquid–liquid extraction (LLE) remains a cornerstone of sample preparation in environmental and analytical chemistry. By selectively partitioning analytes between immiscible liquid phases, LLE enables efficient cleanup, concentration, and preservation of target compounds while minimizing contamination and loss.

Objectives and Study Overview

This manual describes the ROT-X-TRACT-L Model 13308, an automated bench-top LLE system designed to process up to eight samples in parallel. Key goals include reproducible extraction rates, integrated solvent vapor recovery, and optional safety features for handling flammable solvents.

Methodology and Instrumentation

The ROT-X-TRACT-L system couples precise thermal control with efficient condensation and solvent recycling.

• Eight-position stainless steel water bath (1 400 W at 120 V) with uniform heating and exchangeable glass assemblies.
• Parallel water manifold delivering up to 2.5 L/min coolant flow to Allihn condensers; minimum 1 L/min per position.
• External control box housing power switch, energy (temperature) control, flow meter, pressure-reducing regulator, filter, and low-flow protection circuit.
• Optional Type-Z positive-pressure purge: inert or filtered air blanket (>0.5″ H₂O) prevents ingress of flammable vapors into the heated enclosure.
• Glassware kits including KD or round-bottom boiling flasks (250 mL), 1 000 mL extractor bodies (standard or Hershberg–Wolfe), concentrator tubes, frits, and Allihn condensers.

Main Results and Discussion

Under recommended conditions (bath at ~92 °C, condenser coolant <10 °C, 2 500 mL/min flow), dichloromethane recoveries exceed 90 % by volume. The built-in water-failure protection circuit interrupts heating if coolant flow drops below 900 mL/min, safeguarding samples against overheating. The Z-Purge option maintains a slight positive enclosure pressure to mitigate ignition risk when processing volatile or flammable solvents.

Benefits and Practical Applications

• High throughput: simultaneous evaporation and extraction of up to eight samples accelerates routine methods such as environmental pollutant analysis.
• Reproducibility: precise temperature and flow control ensure consistent extraction kinetics and quantitative recoveries.
• Solvent economy: integrated vapor recovery minimizes solvent consumption and laboratory emissions.
• Safety: low-flow shutoff and optional positive-pressure purge allow handling of flammable solvents with reduced fire risk.
• Versatility: compatible with tap water, distilled/de-ionized water, or oil baths; modular glassware adapts to diverse applications.

Future Trends and Possibilities

• Digital integration: automated temperature, flow, and pressure control with data logging and remote monitoring.
• Miniaturization: micro-scale extraction formats to reduce sample and solvent volumes for trace analysis.
• Online hyphenation: direct coupling to GC, LC, or MS for seamless processing workflows.
• Enhanced safety: explosion-proof enclosures, nitrogen-blanket systems, and advanced purge-and-pressurization schemes for wider solvent compatibility.

Conclusion

The ROT-X-TRACT-L Model 13308 provides a robust, scalable platform for automated liquid–liquid extraction with high solvent recovery, precise thermal management, and configurable safety features. Its modular design and parallel processing capability make it an ideal choice for environmental, pharmaceutical, and quality-control laboratories seeking reproducible, high-throughput sample preparation.

References

Not applicable.