Shenjia Hydraulics

Release Date:

2022-11-23

Core‑preparation manufacturers consider the high‑pressure reactor to be an ideal piece of equipment for conducting a wide range of stirred‑reaction experiments in the laboratory. It is suitable for stirring materials of varying viscosities under diverse reaction conditions, such as gas–liquid reactions, gas–liquid–solid reactions, and liquid–solid reactions. When used in the laboratory, high‑pressure reactors typically have specific requirements for the installation environment, including ventilation and lighting conditions. Therefore, when installing a new high‑pressure reactor, it is essential to follow the manufacturer’s operating instructions carefully.

　　Core Preparation The manufacturer believes that A high-pressure reactor is an ideal piece of equipment for conducting various stirred‑reaction processes in the laboratory. It is suitable for stirring materials of differing viscosities under a range of reaction conditions, such as gas–liquid reactions, gas–liquid–solid reactions, and liquid–solid reactions. When used in the laboratory, high-pressure reactors typically have specific requirements for the installation environment, including ventilation and lighting. Therefore, when installing a high-pressure reactor at a new location, it is essential to follow the manufacturer’s operating instructions.

Core Preparation

　　The core‑preparation manufacturer recommends the following pre‑use inspection procedure for laboratory high‑pressure reactors:

　　1. Add 250 mL of water to the reactor, install the reactor lid, and tighten the bolts according to the procedure described above. Then purge the autoclave with nitrogen to a pressure of approximately 0.7 MPa and perform a pressure hold for 30 minutes. Monitor the pressure to detect any changes and determine whether there are leaks. If a leak is detected, first release the nitrogen from the kettle, then retighten the bolts.

　　2. According to the core‑preparation manufacturer, after the pressure test is completed, release the nitrogen from the reactor, turn on the power, and initiate stirring and heating, maintaining a controlled stirring speed and a heating rate of no more than 100 °C/h. Simultaneously, cool the stirring shaft with cooling water, set the temperature to approximately 160 °C, and record the reactor pressure at various temperatures. During the experiment, measure and record the pressure every 10 minutes.

　　3. After the core preparation is completed, cool the experimental solution in the high-pressure reactor with cooling water until its temperature drops below 80°C, then open the vent valve to release the pressure inside the vessel. Once the laboratory high-pressure reactor has cooled, remove the lid, clean the reactor body, and shut off the cooling water and the power supply.

　　Core‑preparation manufacturers consider the autoclave to be a precision instrument. Its sealing system employs a conical‑surface contact seal; tightening the main bolts presses the mating surfaces together, achieving a leak‑tight closure. Therefore, special care must be taken with the sealing cone to prevent damage from impacts or other mechanical stress. When installing the lid, first set the reactor vessel in place, then carefully position the lid on the vessel according to the designated alignment marks. During tightening of the main bolts, apply torque symmetrically and in alternating sequences, ensuring even force distribution. The lid must not tilt to one side to ensure proper sealing, and the specified tightening torque must not be exceeded to avoid crushing or prematurely degrading the sealing surface. Throughout assembly, all threaded connections should be lubricated with oil or a mixture of oil and graphite. If the sealing surface is damaged, rework and repair are required to restore optimal sealing performance.

　　Core‑preparation manufacturers recommend that, prior to use, the autoclave be subjected to a sealing test by heating and pressurizing it. The test medium may be air or nitrogen, but an inert gas is preferred. Oxygen or any other flammable or explosive gas must never be used. Heating and pressure increase should be carried out gradually, with a temperature rise rate not exceeding 80°C per hour. During the pressure test, connect the autoclave’s inlet valve to a compressor (or a high‑pressure pump) via a connecting line. Pressure should be raised in several steps, each increment corresponding to 20% of the working pressure, with a dwell time of 5 minutes at each stage; once the test pressure is reached, maintain it for 30 minutes to verify the seal. The test pressure should be 100–105% of the working pressure. If a leak is detected, first reduce the pressure, then gently tighten the nuts and fittings as needed. Under no circumstances should nuts or fittings be tightened while the system is under high pressure.