High-Pressure Reactor Cleaning Requirements and Precautions

Reactor Construction and Materials

• Material Options:
  ▪ 1cr18Ni10Ti stainless steel (standard)
  ▪ Titanium (TA2) for highly corrosive media
  ▪ Nickel (Ni6) or composite steel for special applications
• Design Features:
  ▪ Flat/convex lids; closed-body with manholes available
  ▪ Customizable lid openings for specific needs
  ▪ Heating methods: jacket steam, hot oil, or electric heating
  ▪ Optional mirror-polished interior (Ra ≤ 0.8μm) and conical bottoms for high-viscosity materials

Step-by-Step Cleaning Protocols

1. Residue Removal:
   • Flush the reactor with reaction solvent via the exhaust valve to remove major residues.
   • Add water to 50% capacity and agitate for 10 minutes before opening the lid.
2. Comprehensive Cleaning:
   • Thoroughly clean the lid, sampling valves, and interior walls.
   • While the reactor contains water, purge with low-pressure nitrogen to displace air.
3. Long-Term Storage Prep:
   • For unused reactors, fill with 70% volume of clean anhydrous ethanol and leave bolts slightly loose to prevent seal degradation.

Critical Operational Precautions

1. Safety Compliance:
   • Operate only within the rated pressure and temperature limits marked on the vessel.
   • Use the reactor in designated areas and follow manufacturer instructions strictly.
2. Seal Maintenance:
   • Conical Seal System: The seal relies on tapered surfaces compressed by main bolts. Avoid impacts to the sealing cone.
   • Tightening Protocol: Tighten main bolts diagonally in multiple stages, ensuring even pressure (do not exceed specified torque to prevent seal damage).
3. Instrument Care:
   • Pressure Gauges: Operate at ≤ 50% of the gauge's rated range; calibrate regularly against standard gauges.
   • Oxygen Gauges: Never use oxygen-rated gauges for other gases.
4. Safety Devices:
   • Ensure safety valves and devices are regularly inspected and certified.
5. Thermometer Placement:
   • Insert the thermometer fully into the reaction medium for accurate readings.
6. Hygiene Management:
   • Keep the interior and gasket areas free of debris.
   • When closing the flange lid, tighten diagonal bolts sequentially to maintain even sealing.
7. Emergency Measures:
   • If a pressure gauge or thermometer cracks, evacuate the area immediately; replace glass components before reuse.

Maintenance Tips for Longevity

• Corrosion Prevention: After cleaning, inspect for surface damage and apply protective coatings to vulnerable areas.
• Lubrication: Periodically lubricate moving parts (e.g., valve stems) with compatible grease.
• Record-Keeping: Maintain a log of cleaning cycles, pressure tests, and component replacements.