Operation sequence for normal operation of the diol unit

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Operating sequence for normal startup of the diol unit: ① Before starting up, check that all valves, equipment, pipelines, and electrical instruments in the system are in good condition, and that the valves are opened and closed correctly. ② Contact the dispatch team and relevant departments to make preparations for startup. ③ Close the bypass valves, slightly open the system inlet valve, and pressurize the system to 5 MPa, controlling the pressure increase rate at ≤0.4 MPa/min. ④ Raise the temperature by starting the circulation pump; use an electric furnace to control the temperature increase rate at ≤40°C/h, and gradually reduce the power of the electric furnace based on the temperature rise of the catalyst layer, keeping its temperature within the specified range. ⑤ During the gas exchange process, the pressure increase should be coordinated with the temperature rise; once the pressure reaches equilibrium with the system pressure, normal production can begin.