1、 Cleaning process and precautions

The laboratory hydrogenation reactor should be cleaned immediately after use to avoid the solidification of reaction residues. Firstly, it is necessary to confirm that the pressure inside the kettle has been fully released and the temperature has dropped to a safe range (usually below 50 ℃). Before disassembly, all power and gas connections must be disconnected, and a 'cleaning in progress' warning sign must be hung.

For regular cleaning:

1. Use a soft bristled brush to remove visible residues on the inner wall of the kettle body

2. Rinse 3-5 times with deionized water (do not use hard cleaning tools such as steel wire balls)

3. For organic residues, acetone or ethanol soaking can be used (time not exceeding 15 minutes)

4. It is recommended to use a 5% citric acid solution for circulating cleaning of inorganic salt deposition

Special plans need to be developed for the treatment of special pollutants:

• Heavy metal residues: Use EDTA chelating agent combined with ultrasonic cleaning

• Polymer reactants: Special solvents should be selected under the guidance of professionals

Strong corrosive substances: require secondary treatment with neutralizing solution after cleaning

After cleaning, it must be dried, and nitrogen blowing or hot air drying below 60 ℃ can be used. Finally, wipe and inspect with a white silk cloth to ensure there are no fiber residues.

2、 System maintenance standards

1. Maintenance of sealing system

Check the elasticity of the O-ring after each use and replace it quarterly

If there are scratches on the sealing surface, it needs to be polished with 800 grit or more sandpaper

Regularly apply vacuum silicone grease (KrytoxGPL205 series is recommended)

2. Pressure component inspection

Monthly airtightness test (0.3MPa nitrogen pressure maintained for 30 minutes)

The safety valve is sent to a professional organization for calibration every six months

Pressure gauges need to be regularly calibrated (with a cycle not exceeding 12 months)

3. Maintenance of mixing system

Apply high-temperature grease to the magnetic coupler every month

• The concentricity of the mixing shaft should be checked quarterly (deviation should be less than 0.1mm)

• Keep the mechanical seal cooling water circuit unobstructed

4. Electrical system maintenance

Dust removal of control cabinet once every two months (using anti-static brush)

Heating element insulation resistance ≥ 1M Ω (tested with a 500V megohmmeter)

Monthly functional testing of emergency stop devices

3、 Long term storage requirements

When the device is out of service for more than 30 days:

1. Fill the inner cavity with dry nitrogen gas for protection (pressure 0.05MPa)

2. All interfaces are sealed with blind plates

3. The storage environment should meet the following requirements: temperature 10-30 ℃, relative humidity ＜ 60%

4. Conduct no-load trial operation every quarter when starting up

4、 Key points for safe operation

Cleaning and maintenance must be carried out by trained personnel, wearing PPE such as chemical protective clothing and goggles. Emergency flushing equipment should be prepared in advance when dealing with hazardous chemicals. Before maintenance, the system must be emptied, and residual gas needs to be replaced with inert gas at least three times.

By establishing a standardized cleaning and maintenance process, combined with detailed usage records (recommended to be kept for at least three years), the reliability of the hydrogenation reactor can be significantly improved. Laboratory management personnel should regularly organize maintenance training to ensure that all operators are familiar with equipment characteristics and maintenance requirements. Only by combining daily maintenance with scientific management can the scientific research value of precision equipment be fully realized.