JP4212731B2 - Gas filtration device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a gas filtration equipment.
[0002]
[Prior art]
Conventionally, when obtaining a polymer or copolymer, for example, a polyolefin such as polyethylene, an olefin monomer such as ethylene is subjected to a gas phase polymerization reaction in the presence of a titanium solid catalyst, a metallocene catalyst, or the like. A polymerization method is used.
[0003]
The gas phase polymerization apparatus 100 used for such a gas phase polymerization method supplies, for example, the solid catalyst A into the fluidized bed reactor 110 via the supply line 112 and also supplies the supply line 113 as shown in FIG. The gaseous olefin is blown from the bottom of the fluidized bed reactor 110 through a gas dispersion plate 111 made of a porous plate or the like disposed in the vicinity of the bottom of the fluidized bed reactor 110, and the fluidized bed (reaction system) 114. The polymerization reaction is carried out in the fluidized bed 114 while maintaining the fluidized state.
[0004]
The polymer particles generated by the polymerization reaction in the fluidized bed 114 are continuously extracted from the fluidized bed reactor 110 via the line 115.
[0005]
Further, the unreacted gaseous olefin or the like that has passed through the fluidized bed 114 of the fluidized bed reactor 110 is reduced in the flow velocity in the deceleration region 116 provided in the upper part of the fluidized bed reactor 110, and fluidized bed reaction. It is discharged out of the fluidized bed reactor 110 through a gas outlet 110A provided at the top of the vessel 110.
[0006]
On the other hand, the unreacted gaseous olefin discharged from the fluidized bed reactor 110 is cooled through the heat exchanger (cooling device) 119 disposed on the circulation line 117, and again in the fluidized bed reactor 110. The fluidized bed 114 is blown.
[0007]
The gaseous olefin is supplied to the blower 118 together with new unreacted gas via the supply line 120 that joins the circulation line 117, and continuously supplied to the fluidized bed reactor 110 by the blower 118. ing.
[0008]
Further, a part of the gas flowing through the circulation line 117 is extracted through the extraction line 120, and in the gas filtration device 122, catalyst particles, polymer particles and the like accompanying the gas enter the filtration chamber 124 of the gas filtration device 122. After being filtered by the provided filter member 126 and extracted from the gas filtration device 122, the gas component is adjusted by the gas component adjustment device 123, and then supplied again to the fluidized bed reactor 110 through the gas circulation line 130. It has come to be.
[0009]
On the other hand, solid components such as catalyst particles and polymer particles deposited in the filtration chamber 124 of the gas filtration device 122 are discharged through the solid component discharge port 132 and extracted through the extraction line 134.
[0010]
In addition, the gas accompanying the solid components such as catalyst particles and polymer particles discharged through the solid component discharge port 132 is adjusted again in the gas component adjusting device 136 and then again through the gas circulation line 138. The fluidized bed reactor 110 is supplied.
[0011]
[Problems to be solved by the invention]
By the way, as shown in the enlarged view of FIG. 5 , the gas filter 122 used in the gas phase polymerization apparatus 100 is configured such that the gas extracted from the circulation line 117 through the extraction line 120 is a gas filter. The gas is introduced into a filtration chamber 124 of 122 through a gas introduction port 125 for introducing gas. The gas inlet 125 is opened so as to face the side wall 124 a of the filtration chamber 124.
[0012]
Accordingly, the gas A introduced from the gas inlet 125 abuts against the side wall 124a of the filtration chamber 124 as shown by the arrow in FIG. 5 , and the flow is changed upward and downward. Among them, the polymer particles produced by the polymerization reaction in the fluidized bed 110 may be reduced in gas flow rate due to the operating conditions and the properties of the product resin. Due to the stagnation, the powder or mist polymer particles accompanying the unreacted olefin gas often adhere to and deposit on the wall surface of the side wall 124a of the filtration chamber 124 (B in FIG. 5 ). The resin adhered and deposited in this manner peels off from the wall surface of the side wall 124a during a long-term operation and falls to the solid component discharge port 132 of the filtration chamber 124, resulting in blockage and the like, impairing stable operation. (C in FIG. 5 ).
[0013]
In view of such a situation, the present invention prevents the powdery or mist-like polymer particles accompanying the unreacted olefin gas from adhering to and depositing on the side wall of the gas filtration device and falling to the solid component discharge port. , and to provide a filtration equipment which efficiently gas filterable.
[0014]
[Means for Solving the Problems]
The present invention has been made to achieve the above-described problems and objects in the prior art, and the gas filtration device of the present invention is a gas filtration device that filters entrained solid components in a gas from the gas. There,
A filtration chamber;
A filter member disposed in the filtration chamber;
A gas inlet for introducing gas into the filtration chamber;
A gas discharge port for discharging a clean gas introduced from the gas introduction port and filtered to remove the entrained solid components in the gas through the filter member;
A solid component discharge port for discharging the solid component deposited in the filtration chamber to the outside of the filtration chamber;
A gas introduction port for introducing the gas into the filtration chamber is provided so that the gas introduced through the gas introduction port does not directly contact the side wall of the filtration chamber facing the gas introduction port. A base pipe portion arranged in an annular shape along the inner periphery of the side wall of the filtration chamber is provided so as not to face the side wall facing the gas inlet, and the tip of the gas inlet is provided in the base pipe portion. A plurality of outlets are formed .
[0015]
By configuring in this way, the gas introduction port for introducing the gas into the filtration chamber is arranged so that the front end outlet does not face the side wall facing the gas introduction port of the filtration chamber, so that the gas introduction port is introduced through the gas introduction port. Since the generated gas does not directly contact the side wall of the filtration chamber facing the gas inlet, the powder or mist polymer particles accompanying the unreacted olefin gas adhere to and deposit on the side wall of the gas filtration device. Thus, gas can be efficiently filtered without falling to the solid component outlet. Further, in the present invention, since a plurality of the gas outlet inlets and outlets are formed, a further stirring flow is generated in the filtration chamber, so that the powder or mist polymer particles entrained by the unreacted olefin gas However, the gas can be efficiently filtered without adhering to and depositing on the side wall and the filter member of the gas filtration device and falling to the solid component discharge port.
[0016]
Accordingly, stable operation for a long period of time can be performed, and a polymer with a certain product quality can be produced.
In the present invention, the front end outlet of the gas introduction port is arranged in a direction away from the filter member.
[0017]
As a result, the gas does not directly contact the inner wall of the filtration chamber and the filter member, and a stirring flow is generated. Therefore, the powdery or mist-like polymer particles accompanying the unreacted olefin gas are removed from the side wall of the gas filtration device and the filter. Gas can be efficiently filtered without adhering to and accumulating on the member and falling to the solid component outlet.
[0018]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments (examples) of the present invention will be described in more detail with reference to the drawings. FIG. 1 is a schematic view showing a first embodiment of the gas phase polymerization apparatus of the present invention, and FIG. 2 is a partially enlarged schematic view of the gas filtration apparatus.
[0019]
In FIG. 1, reference numeral 10 denotes a gas phase polymerization apparatus of the present invention as a whole. The gas phase polymerization apparatus 10 has a substantially cylindrical fluidized bed reactor 12, and this fluidized bed reactor 12 is formed to have a cylindrical straight body portion 14 and an enlarged diameter at the upper portion thereof. A free board unit 16 is provided.
[0020]
When a polymer or copolymer, for example, a polyolefin such as polyethylene, is obtained, a solid catalyst A such as a titanium-based solid catalyst or a metallocene catalyst is fed into the fluidized bed reactor 12 via the supply line 18. Supplied from the side of the straight body 14.
[0021]
On the other hand, for example, an olefin gas or the like is supplied from the bottom 22 of the fluidized bed reactor 12 through the supply line 20 to the gas dispersion plate 24 including a perforated plate disposed in the vicinity of the bottom of the fluidized bed reactor 12. The polymerization reaction is performed in the fluidized bed 26 while blowing the monomer and maintaining the fluidized bed (reaction system) 26 in a fluidized state.
[0022]
Then, the polymer or copolymer particles (hereinafter simply referred to as “polymer particles”) generated by the polymerization reaction in the fluidized bed 26 pass through the extraction line 28 provided on the side portion of the straight body portion 14. Through the fluidized bed reactor 12.
[0023]
On the other hand, the unreacted gaseous monomer that has passed through the fluidized bed 26 has its flow velocity (gas linear velocity) decelerated at the free board portion 16 that constitutes the deceleration region provided in the upper part of the fluidized bed reactor 12. Then, the gas is discharged to the outside of the fluidized bed reactor 12 by the circulation line 32 through the gas outlet 30 provided in the upper part of the fluidized bed reactor 12.
[0024]
Then, the unreacted gaseous monomer discharged to the outside of the fluidized bed reactor 12 by the circulation line 32 in this way passes through the monomer supply line 35 that joins in the middle of the circulation line 32. It is continuously supplied from a monomer supply source (not shown) and supplied together with the monomer gas into the fluidized bed reactor 12 through the supply line 20 again.
[0025]
The unreacted monomer discharged from the fluidized bed reactor 12 must be removed from the polymerization reaction heat before being blown into the fluidized bed 26 in the fluidized bed reactor 12 again. Is introduced into a heat exchanger (cooling device) 34 disposed on the upstream side and cooled. Then, the cooled monomer gas is supplied from the bottom of the fluidized bed reactor 12 to the inside of the fluidized bed reactor 12 through the gas dispersion plate 24 via the circulation line 36 such as a blower. It is configured to be blown into the fluidized bed 26. In this embodiment, the heat exchanger 34 is disposed on the upstream side of the circulation device 36, but the heat exchanger 34 may be disposed on the downstream side of the circulation device 36.
[0026]
A part of the gas flowing through the circulation line 32 is extracted through the extraction line 38, and in the gas filtration device 40, catalyst particles and polymer particles accompanying the gas are contained in the filtration chamber 42 of the gas filtration device 40. After the gas is filtered by the filter member 44 provided in the gas, the clean gas is extracted from the gas filter 40 and the gas component is adjusted by the gas component adjuster 50, and then again through the gas circulation line 52. It is supplied to the reactor 12.
[0027]
On the other hand, solid components such as catalyst particles and polymer particles deposited in the filtration chamber 42 of the gas filtration device 40 are discharged through a rotary valve 49 provided at the solid component discharge port 46 and are extracted through an extraction line 51. It is supposed to be.
[0028]
The gas accompanying the solid components such as catalyst particles and polymer particles discharged through the solid component discharge port 46 is adjusted again by the gas component adjusting device 53 and then again through the gas circulation line 54. The fluidized bed reactor 12 is supplied.
[0029]
In this case, as shown in the enlarged view of FIG. 2, the gas filtration device 40 includes a so-called cyclone-shaped filtration chamber 42 having a substantially cylindrical shape and a lower portion having a conical shape. In the upper part of the filtration chamber 42, a filter member 44 made of a filter arranged so as to hang downward at a predetermined interval is disposed, and the clean gas filtered by the filter member 44 is gas filtered. A gas discharge port 48 formed at the top of the chamber 42 is discharged to the outside of the filtration chamber 42. As described above, after the gas component is extracted and adjusted in the clean gas component adjusting device 50, it is supplied again to the fluidized bed reactor 12 through the gas circulation line 52.
[0030]
In addition, a gas introduction port 41 for introducing a part of the gas flowing through the circulation line 32 extracted through the extraction line 38 into the filtration chamber 42 is formed in the filtration chamber 42 of the gas filtration device 40. Yes. A gas introduction guide pipe 43 is connected to the gas introduction port 41, and the tips of the plurality of guide pipes 43 d of the gas introduction guide pipe 43 are bent downward, that is, in a direction away from the filter member 44. The opening 43e is open to the conical part 42a side below the filtration chamber 42.
[0031]
Here, in this embodiment, the gas introduction guide pipe 43 is provided with a base pipe part 43c that is annularly arranged along the inner periphery of the side wall 42b of the filtration chamber 42, and is spaced apart from the base pipe part 43c by a predetermined distance. A plurality of guide tubes 43d that hang downward is provided, and an opening 43e formed at the tip of the guide tube 43d is configured to open toward the conical portion 42a below the filtration chamber 42.
[0032]
By doing so, a uniform stirring flow of gas is generated in the filtration chamber 42. Therefore, the filtration effect is improved, and the powdery or mist-like polymer particles accompanying the unreacted olefin gas are not attached and deposited on the wall surface of the side wall 42b of the filtration chamber 42, and are attached and deposited. The resin is peeled off from the side wall during long-term operation and falls to the solid component discharge port 46 of the filtration chamber 42, causing a blockage and the like, so that there is no possibility of hindering stable operation. Of course, the number of the guide pipes 43d, the arrangement position, and the like can be changed as appropriate.
[0033]
As mentioned above, although the Example of this invention was described, this invention is not limited to these at all. For example, in the above description, a vertical filter device in which the filter member 44 is disposed above the filter chamber 42 is shown, but it is needless to say that the filter device can be applied to a horizontal filter device.
[0034]
【The invention's effect】
According to the present invention, the gas introduction port for introducing the gas into the filtration chamber is arranged so that the tip outlet thereof does not face the side wall facing the gas introduction port of the filtration chamber, so that the gas introduction port is introduced through the gas introduction port. Since the gas does not directly contact the side wall of the filtration chamber facing the gas inlet, the powdery or mist polymer particles accompanying the unreacted olefin gas adhere to and accumulate on the side wall of the gas filtration device. Gas can be efficiently filtered without falling to the component outlet.
[0035]
Therefore, according to the present invention, powder-like or mist-like polymer particles entrained in the unreacted olefin gas do not adhere to and accumulate on the side wall of the gas filtration device, and a long-term stable operation operation can be performed. It can provide gas filtration equipment capable of producing a polymer of constant product quality.
[Brief description of the drawings]
FIG. 1 is a schematic view showing a first embodiment of a gas phase polymerization apparatus of the present invention.
FIG. 2 is a partially enlarged schematic view of the gas filtration device of FIG. 1;
Figure 3 is an IV 2 - is a cross-sectional view taken along the IV line.
FIG. 4 is a schematic view of a conventional gas phase polymerization apparatus .
FIG. 5 is an enlarged view of a conventional gas filtration device .
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 Gas phase polymerization apparatus 12 Fluidized bed reactor 14 Straight body part 16 Free board part 18 Supply line 20 Supply line 22 Bottom part 24 Gas dispersion plate 26 Fluidized bed 28 Line 30 Gas outlet 32 Circulation line 34 Heat exchanger 35 Monomer supply Line 36 Circulator 38 Line 40 Gas filtration device 41 Gas inlet 42 Gas filtration chamber 42a Conical portion 42b Side wall 42 Filtration chamber 43 Gas introduction guide piping 43c Base piping portion 43d Guide tube
43e opening 44 Filter member 46 Solid component discharge port 48 Gas discharge port 49 Rotary valve 50 Gas component adjustment device 52 Gas circulation line 53 Gas component adjustment device 54 Gas circulation line

Claims (2)

A gas filtration device for filtering entrained solid components in gas from gas,
A filtration chamber;
A filter member disposed in the filtration chamber;
A gas inlet for introducing gas into the filtration chamber;
A gas discharge port for discharging a clean gas introduced from the gas introduction port and filtered to remove the entrained solid components in the gas through the filter member;
A solid component discharge port for discharging the solid component deposited in the filtration chamber to the outside of the filtration chamber;
A gas introduction port for introducing the gas into the filtration chamber is provided so that the gas introduced through the gas introduction port does not directly contact the side wall of the filtration chamber facing the gas introduction port. Arranged so as not to oppose the side wall facing the gas inlet, and provided with a base pipe part arranged in an annular shape along the inner periphery of the side wall of the filtration chamber, the base pipe part is arranged at a fixed interval. A gas filtration device in which a plurality of outlets and outlets of the gas introduction port are formed through the guide tube .   The gas filtration device according to claim 1, wherein a tip outlet of the gas introduction port is disposed in a direction away from the filter member.

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