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How to Effectively Clean and Maintain Laboratory Rotary Evaporators
Rotary evaporators are essential for solvent recovery and concentration, but 78% of performance issues stem from improper cleaning. Follow these scientifically validated methods to eliminate contamination risks and extend equipment lifespan.
- Continuous Drainage System**: Maintain condenser TDS <50 ppm ([Water Quality Guide](#))
- Anti-scaling Protocol:
• Add 0.1% EDTA in cooling water (pH 7.5-8.5)
• Control concentration factor ≤5X
*Result: 90% reduction in calcium carbonate deposits*
| Component | Max Temp | Cleaning Impact |
|---|---|---|
| Borosilicate Glass | 200°C | Thermal shock risk >60°C ΔT |
| PTFE Seals | 260°C | Degrades above 150°C |
Critical Practice:
Cool evaporating flask to <40°C before cleaning
Maintain condenser water film coverage (Condenser Efficiency Tips)
For Accessible Parts (Flask/Condenser):
Dry Cleaning: Use PTFE-coated brushes for loose residue
Wet Process:
a. Rinse with low-polarity solvent (Hexane → Acetone → Ethanol)
b. Soak in 2% citric acid (60°C/30min) for mineral scale
c. Steam sterilize at 121°C for biological contaminants
Non-Brushable Areas (Valves/Tubing):
Circulate 5% NaOH solution (80°C) for 20min
Flush with DI water until neutral pH
| Residue Type | Recommended Agent | Warning |
|---|---|---|
| Organic Solvents | Dichloromethane | Avoid halogenated mix with acetone |
| Inorganic Salts | 10% HNO₃ | Never use on aluminum parts |
| Polymer Residues | DMF | Requires fume hood |
| Biological Films | Enzymatic cleaners | Check material compatibility |
Post-Cleaning Verification:
Wipe test with ethanol-moistened kimwipe (no residue)
Conductivity test: <5 μS/cm rinse water
Scheduled Maintenance:
Weekly: Seal lubrication (silicone grease)
Monthly: Condenser pressure test
Quarterly: Calibrate temperature sensors
Performance: 1mm scale reduces condensation efficiency by 40%
Safety: Acetone residue + air = explosion risk (ATEX Zone 1)
Lifespan: Proper cleaning extends rotovap service life by 8-10 years
Critical Warning: Never use abrasive pads on glass surfaces - microscopic scratches increase breakage risk by 300%. For scratch removal services, contact our lab glass experts.