Abstract: A method for drying polyolefin-containing particles includes a drying step of supplying polyolefin-containing particles to a drying container, supplying a drying gas to the drying container, and drying the polyolefin-containing particles in the drying container. In the drying step, a numerical value determined by the following formula (a) is 441 or more and 600 or less. 38.0×[?]CXIS[dL/g]?0.500×CXIS content[% by mass]+1.20×particle temperature during drying[K]+3.

Abstract: Polyolefin powder is transferred from a gas-phase polymerization reactor to a solid-gas separator having a relatively low pressure, while an amount of monomer gas discharged from the gas-phase polymerization reactor is kept low. A polyolefin production apparatus includes a gas-phase polymerization reactor 10 that polymerizes an olefin monomer to produce polyolefin powder, a solid-gas separator 20, a circulation pipe LC having both ends connected to the solid-gas separator, and provided with a first compressor CP1, a hopper 30, a first powder-conveying pipe L1 connecting the gas-phase polymerization reactor and the hopper, and provided with a first valve V1 halfway, and a second powder-conveying pipe L2 connecting an outlet of the hopper and the circulation pipe, and provided with a second valve V2 halfway.

Abstract: A method for drying polyolefin-containing particles includes a drying step of supplying polyolefin-containing particles to a drying container and drying the polyolefin-containing particles in the drying container. In the drying step, a value determined by the following formula (a) is ?0.20 or more and 1.05 or less. 0.00304×apparatus diameter [m]+0.00261×bed height [m]+0.0179×residence time [hr]+0.00213×particle temperature in drying container [K]?0.0109×inclination angle [degree]+0.

Abstract: A method for drying polyolefin-containing particles includes a drying step of supplying polyolefin-containing particles to a drying container, supplying a drying gas to the drying container, and drying the polyolefin-containing particles in the drying container. In the drying step, a numerical value determined by the following formula (a) is 441 or more and 600 or less. 38.0×[?]CXIS [dL/g]?0.500×CXIS content [% by mass]+1.20×particle temperature during drying [K]+3.

Abstract: A method of transferring a slurry is provided. The method involves transferring a slurry containing particles and a liquid using a transfer pump equipped with a ball type check valve. The transfer pump is operated under the condition satisfying the following formula: 7.8×103<P?5.0×105. In the formula, P=W(?1/(?b??1))0.5/(C·d(d+R)R0.5). W represents the particle flow rate (kg/hr) in the slurry passing through the ball type check valve, C represents the particle concentration (kg/m3) in the slurry, d represents the maximum particle diameter (m) of the particles in the slurry, R represents the ball diameter (m) of the check valve, ?1 represents the density (kg/m3) of the liquid, and ?b represents the density (kg/m3) of the ball of the check valve.

Abstract: A polyolefin production system is provided. The polyolefin production system includes a plurality of gas-phase polymerization tanks configured to polymerize an olefin gas to form a polyolefin, a compressor comprising an inlet and an outlet and being configured to compress a an olefin-containing gas, an individual gas feed line disposed at each of the gas-phase polymerization tanks and configured to guide the gas fed from the outlet of the compressor to each of the gas-phase polymerization tanks, an individual gas discharge line disposed at each of the gas-phase polymerization tanks and discharging the gas from each of the gas-phase polymerization tanks, and a first valve installed in each of the individual gas feed lines.

Abstract: The invention relates to a production method of a heterophasic propylene polymerization material containing a propylene homopolymer (I-1) or a propylene copolymer (I-2), and a propylene copolymer (II), wherein the content of the propylene copolymer component (II) is 30% by weight or more, the production method containing the following steps (1) and (2): Step (1): a step of polymerizing a monomer containing propylene in the presence of a catalyst for propylene polymerization to produce a propylene homopolymer (I-1) or a propylene copolymer (I-2), the step satisfying the formula (A): 1100??(1.

Abstract: A method for producing a polyolefin is provided. The method includes steps of polymerizing an olefin in a first gas-phase polymerization tank to obtain polyolefin-containing particles, transferring the polyolefin-containing particles to a second gas-phase polymerization tank through a transfer pipe, and polymerizing an olefin in the presence of the transferred polyolefin-containing particles in the second gas-phase polymerization tank. A connection place between the first gas-phase polymerization tank and the transfer pipe is higher than a connection place between the second gas-phase polymerization tank and the transfer pipe. 130 kPa?P1?P2?0 is satisfied, where P1 represents the pressure in the first gas-phase polymerization tank and P2 represents the pressure in the second gas-phase polymerization tank.

Abstract: A polyolefin production system is provided. The polyolefin production system includes a plurality of gas-phase polymerization tanks configured to polymerize an olefin gas to form a polyolefin, a gas transfer series line connecting the plurality of the gas-phase polymerization tanks to each other in series, a compressor having an inlet and an outlet and being configured to compress an olefin-containing gas, a gas main feed line disposed at the frontmost gas-phase polymerization tank and configured to guide the gas fed from the outlet of the compressor to the frontmost gas-phase polymerization tank, a gas discharge line disposed at the rearmost gas-phase polymerization tank, and a first valve installed in the gas main feed line.

Abstract: The invention relates to a production method of a heterophasic propylene polymerization material containing a propylene homopolymer (I-1) or a propylene copolymer (I-2), and a propylene copolymer (II), wherein the content of the propylene copolymer component (II) is 30% by weight or more, the production method containing the following steps (1) and (2): Step (1): a step of polymerizing a monomer containing propylene in the presence of a catalyst for propylene polymerization to produce a propylene homopolymer (I-1) or a propylene copolymer (I-2), the step satisfying the formula (A): 1100??(1.

Abstract: Provided are a system for producing a polyolefin, a method of producing a polyolefin, and a method of producing a heterophasic propylene polymer material, each of which allows (i) a gel, to be contained in a molded product that is made of an obtained polyolefin, to be reduced and (ii) a polyolefin to be continuously produced stably.

Abstract: A method of transferring a slurry is provided. The method involves transferring a slurry containing particles and a liquid using a transfer pump equipped with a ball type check valve. The transfer pump is operated under the condition satisfying the following formula: 7.8×103<P?5.0×105. In the formula, P=W(?1/(?b??1))0.5/(C·d(d+R)R0.5). W represents the particle flow rate (kg/hr) in the slurry passing through the ball type check valve, C represents the particle concentration (kg/m3) in the slurry, d represents the maximum particle diameter (m) of the particles in the slurry, R represents the ball diameter (m) of the check valve, ?1 represents the density (kg/m3) of the liquid, and pb represents the density (kg/m3) of the ball of the check valve.

Abstract: A polyolefin production system is provided. The polyolefin production system includes a plurality of gas-phase polymerization tanks configured to polymerize an olefin gas to form a polyolefin, a gas transfer series line connecting the plurality of the gas-phase polymerization tanks to each other in series, a compressor having an inlet and an outlet and being configured to compress an olefin-containing gas, a gas main feed line disposed at the frontmost gas-phase polymerization tank and configured to guide the gas fed from the outlet of the compressor to the frontmost gas-phase polymerization tank, a gas discharge line disposed at the rearmost gas-phase polymerization tank, and a first valve installed in the gas main feed line.

Abstract: A method for producing a polyolefin is provided. The method includes steps of polymerizing an olefin in a first gas-phase polymerization tank to obtain polyolefin-containing particles, transferring the polyolefin-containing particles to a second gas-phase polymerization tank through a transfer pipe, and polymerizing an olefin in the presence of the transferred polyolefin-containing particles in the second gas-phase polymerization tank. A connection place between the first gas-phase polymerization tank and the transfer pipe is higher than a connection place between the second gas-phase polymerization tank and the transfer pipe. 130 kPa?P1?P2?0 is satisfied, where P1 represents the pressure in the first gas-phase polymerization tank and P2 represents the pressure in the second gas-phase polymerization tank.

Abstract: A polyolefin production system is provided. The polyolefin production system includes a plurality of gas-phase polymerization tanks configured to polymerize an olefin gas to form a polyolefin, a compressor comprising an inlet and an outlet and being configured to compress a an olefin-containing gas, an individual gas feed line disposed at each of the gas-phase polymerization tanks and configured to guide the gas fed from the outlet of the compressor to each of the gas-phase polymerization tanks, an individual gas discharge line disposed at each of the gas-phase polymerization tanks and discharging the gas from each of the gas-phase polymerization tanks, and a first valve installed in each of the individual gas feed lines.

Abstract: A method for producing a polyolefin is provided. The method includes a step of feeding a polyolefin powder having a catalytic activity into a gas phase polymerization vessel in which there is a polyolefin powder and through which a gas comprising an olefin is being circulated, thereby commencing polymerization of an olefin. The following formula (1) is satisfied: 0.5<?/(?B)<24.0??(1) In formula (1), ? represents the median diameter (?m) of the catalytically active polyolefin powder to be fed into the vapor phase polymerization vessel, ? represents the median diameter (?m) of the polyolefin powder that is contained in the vapor phase polymerization vessel before the feeding of the catalytically active polyolefin powder into the vapor phase polymerization vessel, and B represents the linear gas velocity (m/sec) of the gas containing an olefin within the vapor phase polymerization vessel.

Abstract: Provided are a system for producing a polyolefin, a method of producing a polyolefin, and a method of producing a heterophasic propylene polymer material, each of which allows (i) a gel, to be contained in a molded product that is made of an obtained polyolefin, to be reduced and (ii) a polyolefin to be continuously produced stably.

Abstract: A method for producing a polyolefin is provided. The method includes a step of feeding a polyolefin powder having a catalytic activity into a gas phase polymerization vessel in which there is a polyolefin powder and through which a gas comprising an olefin is being circulated, thereby commencing polymerization of an olefin. The following formula (1) is satisfied: 0.5<?/(?B)<24.0??(1) In formula (1), ? represents the median diameter (?m) of the catalytically active polyolefin powder to be fed into the vapor phase polymerization vessel, ? represents the median diameter (?m) of the polyolefin powder that is contained in the vapor phase polymerization vessel before the feeding of the catalytically active polyolefin powder into the vapor phase polymerization vessel, and B represents the linear gas velocity (m/sec) of the gas containing an olefin within the vapor phase polymerization vessel.

Abstract: A method is provided for producing a propylene polymeric material containing a propylene polymer component high in content of ?-olefin units. The material can be produced stably without stopping of the operation due to clogging of a pipe. The method is one for producing a propylene polymeric material composed of a propylene polymer component (A) and a propylene polymer component (B) via at least two steps, including a first step of producing the component (A) and a second step of producing the component (B) in a gas phase. The partial pressure of the ?-olefin having four or more carbon atoms in the gas phase in the second step reactor is 0.10 MPa or more. A formula, X?0.0025×Y+0.2850, is satisfied, wherein the partial pressure is X MPa, and the content of the propylene polymer component (A) in the propylene polymeric material is Y % by weight.

Abstract: A method is provided for producing a propylene polymeric material containing a propylene polymer component high in content of ?-olefin units. The material can be produced stably without stopping of the operation due to clogging of a pipe. The method is one for producing a propylene polymeric material composed of a propylene polymer component (A) and a propylene polymer component (B) via at least two steps, including a first step of producing the component (A) and a second step of producing the component (B) in a gas phase. The partial pressure of the ?-olefin having four or more carbon atoms in the gas phase in the second step reactor is 0.10 MPa or more. A formula, X?0.0025×Y+0.2850, is satisfied, wherein the partial pressure is X MPa, and the content of the propylene polymer component (A) in the propylene polymeric material is Y % by weight.