JP2010202701A - Transfer method for powder, method for manufacturing olefin polymer, transfer piping, and manufacturing apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a transfer method capable of efficiently transferring a powder. <P>SOLUTION: The transfer method for the powder is a method for transferring the powder from one end part 5 side of the transfer pipe 1 having an opening/closing valve 2 to the other end part 6 side. Even at any time when the opening/closing valve 2 is opened and closed, a gas for cleaning the inside of the transfer pipe 1 is fed from a space between the one end part 5 and the opening/closing valve 2. <P>COPYRIGHT: (C)2010,JPO&amp;INPIT

Description

  The present invention relates to a method for transferring a granular material and a method for producing an olefin polymer using the same.

  As a method for producing an olefin polymer, a method using a fluidized bed reactor is known. In such a polymerization method, a lump such as a lump of polymer or a plate may be generated, and this lump is extracted when the olefin polymer particles are extracted from the fluidized bed reactor. The piping may be blocked.

  As a method for transferring the granular material for preventing such blockage of the piping, Patent Document 1 provides an open / close valve in the piping for transferring the granular material (olefin polymer particles) from the reactor, and the granular material While the body is intermittently transferred and the on-off valve is closed, the cleaning gas is supplied into the pipe between the reactor and the on-off valve, so that the accumulated particulate matter in the pipe is supplied to the reactor. A method of preventing the blockage of the pipe by returning it is disclosed. Further, Patent Document 2 discloses the transfer of powder between gas phase polymerization reactors, in which the gas in the reactor on the rear stage is taken out as a cleaning gas for piping and the on-off valve of the piping is closed. A method is disclosed in which the gas is supplied into the pipe from the downstream side of the on-off valve and the gas is directly returned to the reactor when the on-off valve is open. Further, Patent Document 3 discloses a method of transferring granular materials between gas phase polymerization reactors, using a cleaning process using a high-pressure cleaning gas and a cleaning process using a gas in the reactor, and intermittently using polyolefin. A method for transferring powder particles is disclosed. In Patent Document 3, any gas supplied to the cleaning process is supplied into the pipe from the downstream side of the on-off valve only when the on-off valve of the transfer pipe is closed.

JP 7-163856 A (published June 27, 1995) Japanese Patent Laying-Open No. 2003-285929 (released on October 7, 2003) Japanese Patent Laying-Open No. 2005-68207 (published March 17, 2005)

  By the way, in order to transfer a granular material continuously and efficiently, the further improvement is desired.

  Then, the objective of this invention is providing the transfer method which can transfer a granular material efficiently.

  A method of transferring a granular material from one end side to the other end side of a transfer pipe having an on-off valve, wherein the one end portion is open when the on-off valve is open or closed. And a gas supply method for supplying a gas for cleaning the inside of the transfer pipe from between the opening and closing valve.

  In addition, the method for transferring granular material according to the present invention supplies gas for cleaning the inside of the transfer pipe from between the on-off valve and the other end when the on-off valve is closed. Is preferred.

  In addition, the method for transferring a granular material according to the present invention includes a method for transferring the granular material from between the on-off valve and the other end portion, both when the on-off valve is open and when the on-off valve is closed. It is preferable to supply a gas for cleaning.

  The method for producing an olefin polymer according to the present invention uses the transfer method described above to transfer the powder from the first container connected to the one end to the second container connected to the other end. It is a manufacturing method which has the process of transferring the olefin polymer as a body.

  Moreover, in the manufacturing method of the olefin polymer which concerns on this invention, it is preferable that a 1st container is a reactor for superposing | polymerizing an olefin, and a 2nd container is a hopper.

  In the method for producing an olefin polymer according to the present invention, the gas is preferably at least one selected from the group consisting of hydrogen, nitrogen and olefin monomers.

  In the method for producing an olefin polymer according to the present invention, it is preferable that the time from the closing of the on-off valve to the opening is not less than 5 seconds and not more than 200 seconds.

  Moreover, in the manufacturing method of the olefin polymer which concerns on this invention, it is preferable that the time after the said on-off valve closes and opens and closes next is 1800 second or more and 30000 second or less.

  The transfer pipe according to the present invention is a transfer pipe for transferring a granular material, and includes an on-off valve provided between one end of the transfer pipe and the other end, and the on-off valve from the one end. A first introduction pipe for introducing a gas for cleaning the inside of the transfer pipe provided between and the inside of the transfer pipe provided between the on-off valve and the other end. And a second introduction pipe for introducing a gas for cleaning.

  The apparatus for producing an olefin polymer according to the present invention includes a reactor for polymerizing an olefin to produce a powder containing the olefin polymer, a hopper, and a transfer for transferring the powder from the reactor to the hopper. An olefin polymer production apparatus comprising: a reactor; the reactor is connected to one end of the transfer pipe; the hopper is connected to the other end of the transfer pipe; The transfer pipe is provided with an on-off valve provided between the one end and the other end, and a first gas for introducing a cleaning gas provided between the one end and the on-off valve. And a second introduction pipe for introducing a gas for cleaning provided between the opening / closing valve and the other end.

  According to the method for transferring a granular material according to the present invention, the granular material can be efficiently transferred.

It is a schematic diagram which shows one Embodiment of the manufacturing apparatus of the olefin polymer to which this invention is applied. It is sectional drawing which shows typically the transfer piping 1 shown in FIG.

  The method for transferring granular material according to the present invention is a method for transferring granular material from one end side to the other end side of a transfer pipe having an on-off valve, and when the on-off valve is opened and closed. In any case, a gas (cleaning gas) for cleaning is supplied into the transfer pipe from between the one end and the on-off valve. Here, the powder body may be any material including solids such as powder and particles.

  Hereinafter, an embodiment of a method for producing an olefin polymer to which a method for transferring a granular material according to the present invention is applied will be described with reference to FIGS. 1 and 2. FIG. 1 is a schematic diagram showing an embodiment of an apparatus for producing an olefin polymer to which the present invention is applied.

  As shown in FIG. 1, the transfer pipe 1 in the present embodiment is connected to a gas phase polymerization reactor (first container) 11 for polymerizing olefin on one end side, and on the other end side. Is connected to a hopper (second container) 12 for recovering the olefin polymer. And the granular material containing the particle | grains of an olefin polymer is transferred to the hopper 12 from the gas phase polymerization reactor 11. FIG.

(Powder transfer method)
Next, a method for transferring the above-mentioned granular material via the transfer pipe 1 will be described in detail with reference to FIG. FIG. 2 is a cross-sectional view schematically showing the transfer pipe 1 shown in FIG.

  The granular material is transferred from one end portion 5 of the hollow transfer pipe 1 to the other end portion 6.

  The transfer pipe 1 has an opening / closing valve 2 between the one end portion 5 and the other end portion 6, and the opening and closing of the transfer pipe 1 can start and stop the transfer of the granular material. The position of the on-off valve 2 is preferably selected as appropriate depending on the state of the granular material to be transferred, the length and thickness of the transfer pipe, and the like in the present embodiment, for example, 0.1 m or more from the one end portion 5. It can be set within a range of 0.5 m or more away from the other end 6.

  The transfer pipe 1 is provided with an introduction pipe 3 as a first introduction pipe between the one end portion 5 and the on-off valve 2. The introduction pipe 3 connects the transfer pipe 1 and the cleaning gas tank 7 and is provided with an on-off valve 8. The on-off valve 8 is open both when the on-off valve 2 is open and when it is closed, and supplies the cleaning gas from the cleaning gas tank 7 into the transfer pipe 1 through the introduction pipe 3.

  The position where the introduction pipe 3 is connected to the transfer pipe 1 is preferably in the vicinity of the on-off valve 2. The closer the connection position between the introduction pipe 3 and the transfer pipe 1 is to the on-off valve 2, the lower the possibility that a lump of granular material will be generated between the connection position and the on-off valve 2. Can be effectively prevented.

  As the cleaning gas, for example, a gas containing hydrogen, nitrogen, an olefin monomer, or the like can be used. Examples of the olefin monomer include ethylene, propylene, 1-butene, 1-hexene, 4-methyl-1-pentene, and 1-octene. Further, the pressure of the cleaning gas is preferably higher than the pressure in the gas phase polymerization reactor 11 connected to the one end portion 5, for example, more preferably 100 kPa or more higher than the pressure in the gas phase polymerization reactor 11. More preferably, it is higher than 200 kPa. Thereby, even when the on-off valve 2 is closed, the cleaning gas can efficiently flow to the one end portion 5. Further, the cleaning gas is preferably supplied at a temperature lower than the temperature in the gas phase polymerization reactor 11.

  The cleaning gas tank 7 only needs to store the gas having the pressure described above.

  With the above configuration, when the on-off valve 2 is open, the powder particles are transferred from one end 5 to the other end 6 of the transfer pipe 1 and the transfer pipe 1 from between the one end 5 and the on-off valve 2. The cleaning gas supplied to the inside surely transfers the granular material to the other end portion 6. On the other hand, when the on-off valve 2 is closed, the cleaning gas supplied from between the one end portion 5 and the on-off valve 2 flows to the one end portion 5, and the inside of the transfer pipe 1 is cleaned with the cleaning gas. Therefore, blockage in the transfer pipe 1 can be prevented, and the granular material can be transferred efficiently.

  In addition, regardless of whether the on-off valve 2 is open or closed, by continuously supplying the cleaning gas, it is possible to prevent the granular material from entering and closing the introduction pipe 3. .

  A plurality of introduction pipes 3 may be provided. The more introduction pipes 3, the more cleaning gas can be supplied into the transfer pipe 1, and it becomes easier to prevent the transfer pipe 1 from being blocked.

  The transfer pipe 1 is provided with an introduction pipe 4 as a second introduction pipe between the on-off valve 2 and the other end 6. The introduction pipe 4 connects the transfer pipe 1 and the cleaning gas tank 7 and is provided with an on-off valve 9. When the on-off valve 2 is closed, the on-off valve 9 is opened, and the cleaning gas is supplied from the cleaning gas tank 7 into the transfer pipe 1 through the introduction pipe 4. The opening / closing of the on-off valve 9 may be manually performed, but the opening / closing of the on-off valve 9 may be controlled together with the opening / closing of the on-off valve 2 by a control device or the like. The on-off valve 9 may be opened both when the on-off valve 2 is open and when it is closed. In this case, the cleaning gas is always supplied into the transfer pipe 1 through the introduction pipe 4.

  The position where the introduction pipe 4 is connected to the transfer pipe 1 is preferably in the vicinity of the on-off valve 2. The closer the connection position between the introduction pipe 4 and the transfer pipe 1 is to the on-off valve 2, the lower the possibility that a lump of granular material is generated between the connection position and the on-off valve 2. Blockage can be effectively prevented.

  In this embodiment, the cleaning gas supplied from the introduction pipe 4 is the same as the cleaning gas supplied from the introduction pipe 3 described above. Note that the cleaning gas supplied from the introduction pipe 4 may be a gas different from the cleaning gas supplied from the introduction pipe 3. In this case, it is preferable that the pressure of the cleaning gas supplied from the introduction pipe 4 is higher than at least the pressure in the hopper 12. Thereby, the cleaning gas supplied from the introduction pipe 4 can be efficiently flowed to the other end portion 6.

  With the above configuration, when the on-off valve 2 is closed, the cleaning gas flows from between the on-off valve 2 and the other end 6 to the other end 6, so that the granular material is transferred downstream of the on-off valve 2. Is not interrupted, and the granular material remaining in the transfer pipe 1 can be reliably transferred. Therefore, blockage in the transfer pipe 1 can be prevented, and the granular material can be transferred efficiently.

  In addition, when the cleaning gas is continuously supplied regardless of whether the on-off valve 2 is open or closed, it is possible to prevent the granular material from entering and closing the introduction pipe 4. The granular material is reliably transferred to the other end 6.

  A plurality of introduction pipes 4 may be provided. The more introduction pipes 4 are, the more cleaning gas can be supplied into the transfer pipe 1, and it becomes easier to prevent the transfer pipe 1 from being blocked.

  The on-off valve 2 may be opened and closed manually or sequentially controlled by a control device or the like. Moreover, it is preferable that the length of the closing time and the opening time are appropriately selected depending on the state and amount of the powder to be transferred. For example, in the present embodiment, it is preferable that the closing time from when the opening / closing valve 2 is closed to when it is opened is 5 seconds or more and 200 seconds or less, and the time from when the opening / closing valve 2 is closed to when it is opened is next Is preferably 1800 seconds or more and 30000 seconds or less. More preferably, the on-off valve 2 is periodically opened and closed at such time intervals. By opening and closing the on-off valve 2 in this way, when the on-off valve 2 is closed, the inside of the transfer pipe 1 can be cleaned with the cleaning gas, so that the blockage in the transfer pipe 1 can be effectively prevented, Moreover, when the on-off valve 2 is open, the cleaning gas flows together with the powder and reliably transfers the powder, so that the powder can be transferred efficiently.

  As described above, according to the present invention, since the blockage in the transfer pipe 1 can be effectively prevented, the time during which the on-off valve 2 is opened is lengthened, and the granular material is continuously transferred over a long period of time. be able to.

(Olefin polymerization method)
Next, a method for polymerizing olefins using the gas phase polymerization reactor 11 will be described. In the present embodiment, the olefin is polymerized using the gas phase polymerization reactor 11 to produce an olefin polymer.

  The olefin polymer is obtained by polymerizing an olefin monomer. In this specification, “polymerization” includes not only homopolymerization but also copolymerization, and “polymer” includes not only a homopolymer but also a copolymer.

  Examples of combinations of olefins that can constitute a copolymer include, for example, ethylene and propylene, ethylene and 1-butene, ethylene and 1-hexene, ethylene and 4-methyl-1-pentene, ethylene and 1-octene, propylene and 1 -Butene, ethylene, 1-butene and 1-hexene, ethylene, 1-butene and 4-methyl-1-pentene, and the like.

  As the olefin polymer produced in the present invention, a copolymer of ethylene and an α-olefin having 3 to 20 carbon atoms is preferable, and among them, ethylene having a polyethylene crystal structure and 3 to 20 carbon atoms. A copolymer with an α-olefin is more preferred. As the α-olefin, an α-olefin having 3 to 8 carbon atoms is more preferable, and examples thereof include 1-butene, 1-hexene, 4-methyl-1-pentene, and 1-octene.

  As the gas phase polymerization reactor 11, a so-called fluidized bed type reactor can be used. For example, known methods disclosed in JP-A-58-201802, JP-A-59-126406, JP-A-2-233708, JP-A-4-234409, JP-A-7-62009, etc. A gas phase fluidized bed reactor or the like can be used.

  In the gas phase polymerization reactor 11 in this embodiment, a mixed phase including a gas containing an olefin monomer, a catalyst, olefin polymer particles, and the like is formed, and a circulation introduced from the lower part of the gas phase polymerization reactor 11. It is fluidized by gas and becomes a fluidized bed. Since the circulating gas is dispersed and introduced through the gas dispersion plate 16 provided at the lower part of the gas phase polymerization reactor 11, the fluidized bed flows efficiently. The circulating gas that has passed through the fluidized bed is reduced in flow rate in the deceleration region provided in the upper part of the gas phase polymerization reactor 11 and then passed through the gas outlet provided in the upper part of the gas phase polymerization reactor 11. The gas is discharged to the circulation gas line 15. The circulating gas is blown back from the lower part into the gas phase polymerization reactor 11 through the circulating gas line 15.

  The circulating gas preferably contains, for example, an olefin monomer. Further, for example, hydrogen, an inert gas or the like may coexist in the circulating gas.

  The circulation gas line 15 may be provided with an introduction pipe for introducing the gas used as the circulation gas as described above.

  The circulating gas line 15 is provided with a compressor 13 for compressing the circulating gas, and further a heat exchanger 14 for cooling the circulating gas. Therefore, the circulating gas is compressed by the compressor 13 in the circulating gas line 15, cooled by the heat exchanger 14, and introduced into the gas phase polymerization reactor 11. For this reason, the circulating gas introduced into the gas phase polymerization reactor 11 is one from which the polymerization reaction heat has been removed.

  The pressure in the gas phase polymerization reactor 11 may be a pressure at which all or at least a part of the olefin monomer can exist as a gas, and is preferably 0.1 to 5.0 MPa, for example, 1.5 to 3.0 MPa is more preferable. The temperature in the gas phase polymerization reactor 11 is preferably selected as appropriate depending on the catalyst to be used, the pressure in the reactor, the type of olefin to be polymerized, etc., and is generally preferably 30 to 110 ° C. The flow rate of the circulating gas in the gas phase polymerization reactor 11 is preferably 10 to 100 cm / second, and more preferably 20 to 70 cm / second.

  In addition, it is preferable to add a catalyst for olefin polymerization to the gas phase polymerization reactor 11. As the catalyst, for example, a Ziegler catalyst, a Philips catalyst, a metallocene catalyst using a metallocene compound, or the like can be used. Moreover, it is more preferable to use a metallocene catalyst as the catalyst.

  As the Ziegler type catalyst, for example, JP-A-59-8706, JP-A-59-22907, JP-A-59-22908, JP-A-59-64611, JP-A-59-71309. JP, 60-42404, JP 60-133301, JP 60-215006, JP 62-232405, JP 62-297304, JP JP-A-1-256502, JP-A-1-289809, JP-A-3-81303, JP-A-3-88808, JP-A-3-93803, JP-B-56-18132, JP-B-56- No. 15807, JP-B 61-50964, JP-B 61-363, JP-B 62-56885, JP-A-11-322833, JP-A-11-322833 It can be used those prepared by the method disclosed in, 002-187909 JP.

  Further, as a catalyst, particles obtained by polymerizing (preliminarily polymerizing) a small amount of olefin can be used as disclosed in, for example, JP-A-2001-342211.

  Examples of the metallocene catalyst obtained by prepolymerization in this way include, for example, a solid catalyst component in which a promoter component such as an organoaluminum compound, an organoaluminum oxy compound, and a boron compound and a metallocene compound are supported on a particulate carrier. (For example, as described in JP-A-61-108610, JP-A-61-296008, JP-A-63-89505, JP-A-3-234709, JP-A-6-336502, etc. Particles obtained by pre-polymerizing a small amount of olefin using a cocatalyst component such as an organoaluminum compound and a boron compound as required. Further, for example, it is described in a solid catalyst component (for example, JP-A-2003-171212) in which a promoter component such as an organoaluminum compound, an organoaluminum oxy compound, a boron compound, and an organozinc compound is supported on a particulate carrier. The particles obtained by prepolymerizing a small amount of olefin using a metallocene compound and a catalyst component such as an organoaluminum compound in combination can be used.

  The granular material containing the olefin polymer obtained by polymerization in the gas phase polymerization reactor 11 is discharged to the transfer pipe 1.

  As a method for discharging the granular material from the gas phase polymerization reactor 11 to the transfer pipe 1, for example, a method described in JP-A-2001-139605 (published on May 22, 2001) can be used. Moreover, it is preferable to discharge | emit a granular material continuously, For example, the method described in Japanese translations of PCT publication No. 2002-530441 (published September 17, 2002) can be used for this. Further, as described in, for example, Japanese Patent Application Laid-Open No. 2008-143929 (published on June 26, 2008), both means for continuously discharging particles and means for discharging intermittently are used. May be discharged. In addition, the transfer method of the granular material which concerns on this invention can be used suitably, when discharging a granular material from the gas phase polymerization reactor 11 continuously.

  The granular material is transferred to the hopper 12 in the next process through the transfer pipe 1. The transfer of the olefin polymer from the gas phase polymerization reactor 11 to the hopper 12 is preferably performed by making the pressure in the gas phase polymerization reactor 11 higher than the pressure in the hopper 12 and using a pressure difference. For example, the pressure in the gas phase polymerization reactor 11 can be set to 2.0 MPaG or the like, and the pressure in the hopper 12 can be set to 0.2 MPaG or the like.

  In the hopper 12, the olefin polymer is recovered. Further, unreacted raw material gas, cleaning gas and the like mixed in the powder and granular material introduced into the hopper 12 are collected and reused as recycled gas.

  In the present embodiment, a gas phase polymerization reactor 11 is connected to one end portion 5 of the transfer pipe 1, a hopper 12 is connected to the other end portion 6, and particles are transferred from the gas phase polymerization reactor 11 to the hopper 12. Although the method of transferring has been described, the present invention is not particularly limited thereto, and the present invention can be suitably applied to any case of transferring a granular material that may block a pipe.

  The present invention is not limited to the above-described embodiments, and various modifications can be made within the scope of the claims, and embodiments obtained by appropriately combining the respective technical means disclosed are also included in the present invention. Included in the technical scope. Moreover, all the literatures described in this specification are used as reference.

  Examples will be shown below, and the embodiments of the present invention will be described in more detail. Of course, the present invention is not limited to the following examples, and it goes without saying that various aspects are possible in detail.

  In this example and comparative example, a polymer production apparatus comprising a fluidized bed gas phase polymerization reactor, a post-processing system hopper for recovering the polymer, and two transfer pipes connecting them. Was used.

  In the gas phase polymerization reactor, ethylene and 1-butene were copolymerized to prepare an ethylene-1-butene copolymer. At this time, a preliminary catalyst for vapor phase polymerization of olefin obtained by prepolymerizing a small amount of olefin on the solid catalyst component using a solid catalyst component containing magnesium, halogen, titanium and an electron donor and an organoaluminum compound. A polymerization catalyst (see Example 2 in JP-A-2001-342211) was supplied to a gas phase polymerization reactor. Furthermore, 5.5 mol of triethylaluminum was supplied to 1 ton of the produced polymer.

  Then, the granular material containing a copolymer was transferred to the hopper via two transfer pipes connecting the gas phase polymerization reactor and the hopper. One transfer pipe transferred powder particles continuously, and the other transfer pipe was transferred intermittently.

  In this example, the following items were measured. The method used in each item will be described.

(1) Density (Unit: kg / m ³ )
It measured according to the method prescribed | regulated to A method among JISK7112-1980. The sample was annealed according to JIS K6760-1995.

(2) Melt flow rate (MFR, unit: g / 10 minutes)
According to the method defined in JIS K7210-1995, the measurement was performed under the conditions of a load of 21.18 N and a temperature of 190 ° C.

[Example 1]
In Example 1, as polymerization conditions, the polymerization temperature was 87 ° C., the pressure was 2.0 MPaG, the composition of the circulating gas was 56.5 mol% ethylene, 8.7 mol% hydrogen, 21.9 mol% 1-butene, Nitrogen was 11.5 mol% and hexane was 1.4 mol%, and the flow rate of the circulating gas was 56 cm / sec.

  Further, in the transfer pipe, a transfer pipe for continuously transferring the polymer (corresponding to the transfer pipe 1 in FIG. 1) is connected to a gas phase polymerization reactor (corresponding to the gas phase polymerization reactor 11 in FIG. 1). There is an on-off valve (corresponding to the on-off valve 2 in FIG. 1) at a position 0.35 m from the section, and this on-off valve is opened once every hour after closing for 20 seconds. It was. In addition, an introduction pipe (corresponding to the introduction pipe 3 in FIG. 1) provided at a position of 0.25 m from the one end of the transfer pipe, and an introduction pipe (introduction pipe in FIG. 1) provided at a position of 0.90 m. 4), ethylene was constantly supplied into the transfer pipe at 50 kg / hour as a cleaning gas.

Further, the density of the polymerized ethylene-1-butene copolymer was 919.1 kg / m ³ and the MRF was 0.91 g / 10 min. In this way, the polymer production apparatus was operated.

  Although the operation was continued for more than one month while maintaining the same quality, no blockage of the transfer pipe was observed, and stable operation could be confirmed.

[Comparative Example 1]
In Comparative Example 1, as polymerization conditions, the polymerization temperature was 87 ° C., the pressure was 2.0 MPaG, the composition of the circulating gas was ethylene 54.3 mol%, hydrogen 10.0 mol%, 1-butene 20.8 mol%, Nitrogen was 12.8 mol% and hexane was 2.1 mol%, and the flow rate of the circulating gas was 55 cm / sec.

Further, the density of the polymerized ethylene-1-butene copolymer was 920.7 kg / m ³ and the MRF was 1.16 g / 10 min. In this way, the polymer production apparatus was operated.

  As a result, in the gas phase polymerization reactor, an unbalance between heat generation by polymerization and cooling by a cooler (heat exchanger) was observed. Even if the heat removal by the cooler was strengthened, the polymerization temperature became uncontrollable and reached 95 ° C. or higher. Therefore, an emergency quencher was added to stop the polymerization. The reason why the polymerization temperature became uncontrollable in this way was the blockage of the transfer pipe.

  According to the method for transferring a granular material according to the present invention, it is possible to prevent clogging of piping and efficiently transfer the granular material, and therefore, it can be suitably used for an apparatus for producing a polymer such as olefin.

1 Transfer piping 2 On-off valve 3 Introducing pipe (first introducing pipe)
4 Introduction pipe (second introduction pipe)
5 One end portion 6 Other end portion 11 Gas phase polymerization reactor (first vessel)
12 Hopper (second container)

Claims (10)

A method of transferring a granular material from one end side of a transfer pipe having an on-off valve to the other end side,
Transfer of granular material that supplies gas for cleaning the inside of the transfer pipe from between the one end and the open / close valve when the open / close valve is open and closed Method.   The method for transferring a granular material according to claim 1, wherein a gas for cleaning the inside of the transfer pipe is supplied from between the on-off valve and the other end when the on-off valve is closed.   The gas for cleaning the inside of the transfer pipe is supplied from between the on-off valve and the other end when the on-off valve is open and closed. The transfer method of the granular material as described.   Using the transfer method according to any one of claims 1 to 3, the powder from the first container connected to the one end to the second container connected to the other end. The manufacturing method of an olefin polymer which has the process of transferring the olefin polymer as. The first vessel is a reactor for polymerizing olefins;
The method for producing an olefin polymer according to claim 4, wherein the second container is a hopper.   The method for producing an olefin polymer according to claim 4 or 5, wherein the gas is at least one selected from the group consisting of hydrogen, nitrogen and olefin monomers.   The method for producing an olefin polymer according to any one of claims 4 to 6, wherein a time from when the on-off valve is closed to when it is opened is 5 seconds or more and 200 seconds or less.   The method for producing an olefin polymer according to any one of claims 4 to 7, wherein a time from when the on-off valve is closed until it is opened and then closed is 1800 seconds or more and 30000 seconds or less. A transfer pipe for transferring powder,
An on-off valve provided between one end of the transfer pipe and the other end;
A first introduction pipe for introducing a gas for cleaning the inside of the transfer pipe, provided between the one end portion and the on-off valve;
A transfer pipe comprising a second introduction pipe for introducing a gas for cleaning the inside of the transfer pipe, provided between the on-off valve and the other end. A reactor for polymerizing olefins to produce granules containing the olefin polymer;
A hopper,
An apparatus for producing an olefin polymer, comprising a transfer pipe for transferring the granular material from the reactor to the hopper,
The reactor is connected to one end of the transfer pipe,
The hopper is connected to the other end of the transfer pipe,
The transfer pipe is
An on-off valve provided between the one end and the other end;
A first introduction pipe for introducing a gas for cleaning provided between the one end and the on-off valve;
An apparatus for producing an olefin polymer, comprising: a second introduction pipe for introducing a gas for cleaning provided between the on-off valve and the other end.

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