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    2.
    发明专利
    未知

    公开(公告)号：IT1199674B

    公开(公告)日：1988-12-30

    申请号：IT2244986

    申请日：1986-11-25

    Applicant: MITSUI TOATSU CHEMICALS

    Inventor： TADASHI ASANUMA ,  YOSHIYUKI FUNAKOSCHI ,  KANEO ITO ,  ADIHIKO NAKAJIMA

    IPC: B04C5/14 ,  B01D45/12 ,  B04C5/00 ,  B04C5/15 ,  B04C5/18 ,  B04C5/185 ,  B04C9/00 ,  B01D

    Abstract: Polymer powder is separated from a carrier gas by separating the polymer powder from the carrier gas in a cyclone separator, drawing the thus-separated polymer powder through a bottom part of the separator into a hopper, feeding out the polymer powder by a rotary feeder from the hopper while controlling the revolution speed of the rotary feeder in accordance with the powder level in the hopper, and controlling the volume of a purge gas, which is introduced into a polymer powder guide extending between the separator and the hopper for the prevention of plugging thereof, in accordance with the revolution speed of the rotary feeder. The height of the top of the powder in the hopper is maintained at a predetermined constant level.

    3.
    发明专利
    未知

    公开(公告)号：IT1190377B

    公开(公告)日：1988-02-16

    申请号：IT2123385

    申请日：1985-06-21

    Applicant: MITSUI TOATSU CHEMICALS

    Inventor： TADASHI ASANUMA ,  TATUO OHOKA ,  YOSHIYUKI FUNAKOSHI

    IPC: C08F6/00 ,  B01J19/18 ,  B01J19/24 ,  C08F6/06 ,  C08F6/24 ,  C08F10/00 ,  B01D

    Abstract: The method of continuously operating a counter-flow washing column which is supplied with a slurry of solid polymer particles in a diluent from a continuous polymerization zone and with washing liquid for extracting wash slurry and introducing it into a heat tube to separate the vapor of the washing liquid and the solid polymer particles. The improvement involves controlling the extraction amount of the wash slurry from the column by means of: (i) controlling the quantity of heat added to the heat tube, and further (ii) controlling the amount of liquid to be separately introduced into the heat tube, said controls (i) and (ii) being determined by monitoring the amount of the slurry in the last one of reaction cells in the continuous polymerization zone and, on the basis of the monitored amount, determining the amount of extracted slurry. When larger fluctuations occur in the production of the amount of slurry in the continuous polymerization zone, further controls are made to prevent drastic fluctuations in the ascending viscosity of the washing liquid in the counter-flow washing column, on the basis of the differences between the amount of the vapor separated by the heat tube and the amount of the liquid separately introduced into the heat tube.

    4.
    发明专利
    未知

    公开(公告)号：IT8619615D0

    公开(公告)日：1986-03-04

    申请号：IT1961586

    申请日：1986-03-04

    Applicant: MITSUI TOATSU CHEMICALS

    Inventor： TADASHI ASANUMA ,  TATUO OHOKA ,  MINORU HINO ,  NOBUTAKA UCHIKAWA

    IPC: C08F2/00 ,  B01D3/40 ,  C08F6/00 ,  C08F6/06 ,  C08F10/00 ,  B01D

    Abstract: A process for purifying a solvent suitable for use in the polymerization of an olefin in the presence of a Ziegler-Natta catalyst, which comprises feeding the polymerization solvent to a stage lower than a chimney tray of a multi-stage distillation column, said chimney tray being provided at a height between the top and bottom of the column, feeding an organoaluminum compound to a stage higher than the chimney tray, drawing out a condensate from the chimney tray, heating the condensate to produce heated vapor, introducing the heated vapor to the chimney tray or to a stage higher than the chimney tray but lower than the stage to which the organoaluminum compound has been fed, and drawing the solvent in a purified state from the top.

    5.
    发明专利
    未知

    公开(公告)号：IT1198251B

    公开(公告)日：1988-12-21

    申请号：IT2285586

    申请日：1986-12-23

    Applicant: MITSUI TOATSU CHEMICALS

    Inventor： TADASHI ASANUMA ,  MITSURU ITO ,  KANEO ITO ,  YOSHIYUKI FUNAKOSHI ,  AKIHIKO NAKAJIMA

    IPC: B01J19/00 ,  C08F2/00 ,  C08F2/02 ,  C08F110/06 ,  G01K

    Abstract: Disclosed herein is a method for controlling the polymerization temperature in a polymerization apparatus equipped with a cooling system in which steam, which has occurred in the presence of a volatile liquid medium in a reaction system, is condensed in a reflux condenser and the resulting noncondensable gas and condensate are then returned to the reaction system, thereby removing the polymerization heat. A portion of the noncondensable gas is recirculated to the cooling system. The flow rate of the noncondensable gas to be recirculated and the flow rate of a cooling medium to be introduced into the reflux condenser are controlled in accordance with the temperature of the reaction system.

    6.
    发明专利
    未知

    公开(公告)号：IT1150636B

    公开(公告)日：1986-12-17

    申请号：IT2000582

    申请日：1982-03-05

    Applicant: MITSUI TOATSU CHEMICALS

    Inventor： TADASHI ASANUMA ,  ICHIRO FUJIO ,  NOBUTAKA UCHIKAWA ,  TETSUNOSUKE SHIOMURA

    IPC: C08F297/08 ,  C08F2/02 ,  C08F2/06 ,  C08F2/12 ,  C08F

    Abstract: A propylene-ethylene block copolymer is produced by continuous bulk polymerization in which propylene alone is polymerized or propylene and ethylene are copolymerized at the ethylene/propylene reaction ratio of 6/94 using propylene as a liquid medium, and subsequently by batch-wise copolymerization in which propylene and ethylene are copolymerized at the ethylene/propylene reaction ratio from 85/15 to 5/95.

    8.
    发明专利
    未知

    公开(公告)号：IT8019557D0

    公开(公告)日：1980-01-30

    申请号：IT1955780

    申请日：1980-01-30

    Applicant: MITSUI TOATSU CHEMICALS

    Inventor： TADASHI ASANUMA ,  TETSUNOSUKE SHIOMURA

    IPC: C08F4/00 ,  C08F4/02 ,  C08F4/60 ,  C08F4/64 ,  C08F10/00 ,  C08F

    Abstract: Stereospecific polymerization of alpha -olefins is carried out with use of a catalyst comprising an activated titanium component obtained by treating copulverized products of magnesium halide, an organosilicon compound having at least one alkoxyl group and a halogenated hydrocarbon with titanium halide, an organoaluminum compound and an electron donative compound.

    9.
    发明专利
    未知

    公开(公告)号：IT1199737B

    公开(公告)日：1988-12-30

    申请号：IT2263286

    申请日：1986-12-10

    Applicant: MITSUI TOATSU CHEMICALS INCOR

    Inventor： TADASHI ASANUMA ,  MITSURU ITO ,  KANEO ITO ,  SHIGERU KIMURA ,  NOBUTAKA UCHIKAWA ,  ICHIRO FUJIO

    IPC: B23Q39/02 ,  C08F2/00 ,  C08F297/08 ,  C08F

    Abstract: A block copolymer of propylene is produced by using propylene itself as a liquid medium, conducting continuous polymerization (former-stage polymerization) of propylene alone or propylene and a small amount of ethylene at first and then conducting batchwise copolymerization (latter-stage polymerization) of ethylene and propylene. The amount of an activity improver to be added to a polymerization tank for the latter-stage polymerization and/or the polymerization time of the latter-stage polymerization are controlled in accordance with the amount of a slurry transferred from a polymerization tank for the former-stage polymerization to the polymerization tank for the latter-stage polymerization so as to maintain the ratio of the amount of the polymer polymerized by the former-stage polymerization to the amount of the polymer polymerized by the latter-stage polymerization constant in the block copolymer.

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