What should be paid attention to when heating and cooling the reactor?

### Guidelines for Operating and Maintaining a Reactor

1. **Heating and Cooling**:

- Avoid rapid heating or cooling to prevent cracks and damage caused by excessive temperature stress.

- After the reaction, cool the reactor with water (for exothermic reactions) or air.

2. **Sealing and Pressure Release**:

- Use a wire seal for the needle valve, ensuring a proper seal by compressing the sealing surface without excessive force.

- After the reaction, release high-pressure gas to reduce the internal pressure to atmospheric levels before loosening the bolts symmetrically.

3. **Cleaning and Maintenance**:

- Clean the reactor body, lid, and sealing surfaces after each operation, ensuring they remain dry.

- Avoid using rough or hard materials for cleaning to protect the surfaces.

- Disassemble the agitator for thorough cleaning.

4. **Heat Transfer System**:

- The reactor jacket, typically made of carbon steel, forms a sealed space around the reactor barrel.

- Inlets and outlets are provided for steam, cooling water, or other heat transfer media.

- For larger reactors, spiral baffles or welded semi-circular pipes may be used to enhance heat transfer and reduce energy loss.

5. **Baffle Systems**:

- Heat transfer baffles increase the heat transfer area, improve agitation, and prevent vortex-controlled flow patterns.

- Baffles must remain fully submerged to avoid scaling at the gas-liquid interface.

6. **Jacket Design**:

- The spacing between the jacket and vessel body depends on the reactor's diameter, typically ranging from 25 to 100 mm.

- The jacket height should exceed the liquid level by 50-100 mm to ensure effective heat transfer.

By following these guidelines, the reactor can be operated safely and maintained effectively to ensure optimal performance and longevity.