System and method of preventing olefin polymerized gas phase fluidized bed reactor expansion section from flaking
A technology of fluidized bed reactor and gas phase fluidized bed, which is applied in chemical instruments and methods, chemical/physical processes, etc., and can solve problems such as affecting polymerization production operation and destroying normal fluidized state
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Embodiment 1
[0061] Produce very low density polyethylene resin (VLDPE) by olefin polymerization gas phase fluidized bed reaction process, with a density of 0.912g / cm 3 , index 1.0g / 10min. In this embodiment 1, a gas-phase fluidized bed reactor of 50 kg / hour is adopted, and a self-purging system is introduced in the expansion section of the fluidized bed reactor, and two sets of horizontal pressure are provided on the wall of the expansion section of the reactor. Tangential tangential channels and two sets of inclined tangential channels, downward sloping tangential tangential channels, the inclination angle of the downward sloping tangential tangential channels is 30°, and the two groups of horizontal tangential channels Located at 1 / 4 of the height of the expansion section, the two sets of downwardly inclined tangential channels are located at 3 / 4 of the height of the expansion section, and the control parameters of the process device are:
[0062] (1) The pressure of the fluidized bed ...
Embodiment 2
[0091] Produce very low density polyethylene resin (VLDPE) by olefin polymerization gas phase fluidized bed reaction process, with a density of 0.900g / cm 3 , index 1.0g / 10min. In this embodiment, a 50 kg / hour gas-phase fluidized bed reactor is adopted, and a device with a self-purging system is introduced in the expansion section of the reactor. In this embodiment, 6 sets of tangential channels are provided on the wall of the expansion section of the reactor. Among them, there are 2 sets of horizontal tangential channels at the height of 1 / 2 of the expansion section, 2 sets of downward-sloping tangential channels with an inclination angle of 30° at the height of 1 / 4 of the expansion section, and 2 sets of tangential channels at the height of 3 / 4 of the expansion section The inclination angle is an upwardly inclined tangential channel with an inclination angle of 30°.
[0092] The specific features are as follows:
[0093] The control parameters of the process device are:
...
Embodiment 3
[0113] Produce very low density polyethylene resin (VLDPE) by olefin polymerization gas phase fluidized bed reaction process, with a density of 0.912g / cm 3 , index 1.0g / 10min. In this embodiment, a 50kg / hour gas-phase fluidized bed reactor is adopted, a device with a self-purging system is introduced in the expansion section of the reactor, and two groups of tangential channels are opened in the wall of the expansion section of the reactor. Among them, there are two groups of horizontal tangential holes at 1 / 2 height of the expansion section.
[0114] The control parameters of the process device are:
[0115] (1) The pressure of the fluidized bed reaction system is controlled at 2.0MPa;
[0116] (2) The pressure of the high-pressure fluid is 1.5 times the pressure of the fluidized bed reactor, that is, the high-pressure fluid is controlled at 3.0MPa;
[0117] (3) Pressure difference control range between reactor beds: 0.1KPa-0.6KPa for the first stage, 0.4KPa-0.7KPa for the...
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Abstract
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