Sumitomo Chemical Company, Limited

Satoshi Itoguchi

Masayuki Arakawa

Naoto Yoshimura

Naganjaneyulu Suruvu

Shunpei Funaoka

Masato Suzue

Naohiro Tanaka

Hitoshi Shibashita

Shohei Fukuhara

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]+0.0212×CXS component amount [% by mass]  Formula (a):

Method for drying polyolefin-containing particles and method for storing polyolefin-containing particles

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×[η]CXIS[dL/g]−0.500×CXIS content[% by mass]+1.20×particle temperature during drying[K]+3.29×drying time[hr]  Formula (a):

Method for drying polyolefin-containing particles

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&#xd7;10&#x3c;P&#x2264;5.0&#xd7;10. In the formula, P=W(&#x3c1;/(&#x3c1;&#x2212;&#x3c1;))/(C&#xb7;d(d+R)R). 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, &#x3c1;represents the density (kg/m3) of the liquid, and &#x3c1;represents the density (kg/m) of the ball of the check valve.

Method of transferring slurry, method of producing polyolefin, and use thereof

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.

Method for producing polyolefin and polyolefin production system

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&#x2264;&#x3b1;(1.34&#x3b2;)&#x2003;&#x2003;(A)wherein, &#x3b1; represents the median diameter (unit: &#x3bc;m) of the catalyst for propylene polymerization and &#x3b2; represents the production amount (unit: g/g) of the propylene homopolymer (I-1) or the propylene copolymer (I-2) per 1 g of the catalyst for propylene polymerization in the step (1); Step (2): a step of copolymerizing at least one olefin selected from the group consisting of ethylene and &#x3b1;-olefins having the number of carbon atoms of 4 or more and 12 or less, and propylene in the presence of the propylene homopolymer (I-1) or the propylene copolymer (I-2) obtained in the step (1), using 1 or more gas phase polymerization reactors, to produce a propylene copolymer (II), wherein the concentration of alkanes having the number of carbon atoms of 6 or more in the final gas phase polymerization reactor of the 1 or more gas phase polymerization reactors is 0.01% by volume or more and 0.6% by volume or less.

Method for producing heterophasic propylene polymer material

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&#x2265;P&#x2212;P&#x2265;0 is satisfied, where Prepresents the pressure in the first gas-phase polymerization tank and Prepresents the pressure in the second gas-phase polymerization tank.

Method for producing polyolefin

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.

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. A polyolefin producing system () includes: a cylindrical member which extends in a vertical direction; diameter decreasing members each of which is provided to the cylindrical member, each of the diameter decreasing members having (i) an inner diameter that decreases as the each of the diameter decreasing members extends downward and (ii) a gas inlet opening at a lower end of the each of the diameter decreasing members; spouted bed type olefin polymerization reaction regions () each of which is surrounded by (a) an inner surface of a corresponding one of the diameter decreasing members and (b) part of an inner surface of the cylindrical member which part extends upward from the corresponding one of the diameter decreasing members, each of the spouted bed type olefin polymerization reaction regions () being a region in which a spouted bed is formed, the number of the spouted bed type olefin polymerization reaction regions () being 3 or more; and at least one fluidized bed type olefin polymerization reaction region which is provided at a stage subsequent to the spouted bed type olefin polymerization reaction regions ().

System for producing polyolefin, method of producing polyolefin, and method of producing heterophasic propylene polymer material

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&#x3c;&#x3b2;/(&#x3b1;)&#x3c;24.0&#x2003;&#x2003;(1)In formula (1), &#x3b1; represents the median diameter (&#x3bc;m) of the catalytically active polyolefin powder to be fed into the vapor phase polymerization vessel, &#x3b2; represents the median diameter (&#x3bc;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.

A method is provided for producing a propylene polymeric material containing a propylene polymer component high in content of &#x3b1;-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 &#x3b1;-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&#x2266;0.0025&#xd7;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.

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Ichihara, Japan

Satoshi Itoguchi