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7 records (took 0.021 seconds)

    1.
    发明专利
    未知

    公开(公告)号：DE69118595D1

    公开(公告)日：1996-05-15

    申请号：DE69118595

    申请日：1991-06-09

    Applicant: MITSUI TOATSU CHEMICALS

    Inventor： ONO YUZO ,  KAJIKURI THUTOMU ,  KITADO SHOJI ,  SENOO KENJI

    IPC: C07C51/487 ,  C07C53/19

    Abstract: The present invention is directed to a method for recovering 2-chloropropionic acid so that this compound can be separated in a high-purity form. According to the method, crude 2-chloropropionic acid is heat-treated in the presence of a metal compound at a temperature in the range of 130-180 DEG C where dichloro derivatives are contained as impurities or at a temperature not exceeding 160 DEG C where no dichloro derivatives are contained. The metal compound is then removed at 160 DEG C or lower. Final purification is thereafter conducted to obtain 2-chloropropionic acid as a high-purity product.

    2.
    发明专利
    未知

    公开(公告)号：DE69118595T2

    公开(公告)日：1996-11-07

    申请号：DE69118595

    申请日：1991-06-09

    Applicant: MITSUI TOATSU CHEMICALS

    Inventor： ONO YUZO ,  KAJIKURI THUTOMU ,  KITADO SHOJI ,  SENOO KENJI

    IPC: C07C51/487 ,  C07C53/19

    Abstract: The present invention is directed to a method for recovering 2-chloropropionic acid so that this compound can be separated in a high-purity form. According to the method, crude 2-chloropropionic acid is heat-treated in the presence of a metal compound at a temperature in the range of 130-180 DEG C where dichloro derivatives are contained as impurities or at a temperature not exceeding 160 DEG C where no dichloro derivatives are contained. The metal compound is then removed at 160 DEG C or lower. Final purification is thereafter conducted to obtain 2-chloropropionic acid as a high-purity product.

    3.
    发明专利
    未知

    公开(公告)号：AT136535T

    公开(公告)日：1996-04-15

    申请号：AT91109451

    申请日：1991-06-09

    Applicant: MITSUI TOATSU CHEMICALS

    Inventor： ONO YUZO ,  KAJIKURI THUTOMU ,  KITADO SHOJI ,  SENOO KENJI

    IPC: C07C51/487 ,  C07C53/19

    Abstract: The present invention is directed to a method for recovering 2-chloropropionic acid so that this compound can be separated in a high-purity form. According to the method, crude 2-chloropropionic acid is heat-treated in the presence of a metal compound at a temperature in the range of 130-180 DEG C where dichloro derivatives are contained as impurities or at a temperature not exceeding 160 DEG C where no dichloro derivatives are contained. The metal compound is then removed at 160 DEG C or lower. Final purification is thereafter conducted to obtain 2-chloropropionic acid as a high-purity product.

    PRODUCTION OF ACRYLAMIDE CRYSTAL
    5.
    发明专利
    PRODUCTION OF ACRYLAMIDE CRYSTAL 失效

    公开(公告)号：JPS6236346A

    公开(公告)日：1987-02-17

    申请号：JP7546486

    申请日：1986-04-03

    Applicant: MITSUI TOATSU CHEMICALS

    Inventor： KANBARA YOSHIHIKO ,  ASANO SHIRO ,  ISOZAKI WATARU ,  KITADO SHOJI ,  YAMAGUCHI MASAO

    IPC: C07C231/24 ,  B01D9/00 ,  B01D9/02 ,  C07C20060101 ,  C07C67/00 ,  C07C231/00 ,  C07C233/09 ,  C08J3/12

    Abstract: PURPOSE:To obtain the titled crystals, economically by cooling an aqueous solution of acrylamide in a double-pipe or multitubular heat exchanger, in which the aqueous solution is passed through the inside of cooling pipes, made of stainless steel and electropolished and a refrigerant liquid is passed through the outside thereof. CONSTITUTION:An aqueous solution of acrylamide is cooled in a double-pipe or multitubular heat exchanger, in which the aqueous solution of acrylamide is passed through the inside of cooling pipes made of stainless steel and a refrigerant liquid is passed through the outside thereof, to crystallize the acrylamide. In the process, the cooling pipes are characterized in that the inside thereof is electropolished. The liquid flow velocity at the cooling heat transfer surface must be increased to carry out the cooling and crystallizing of a substance readily causing scale deposition, e.g. acrylamide. A multitubular heat exchange capable of increasing the heat transfer area is particularly preferred for the type of the cooler. The effect of the electropolishing seems to produce good results on a scaling phenomenon of acrylamide crystals by the change in surface conditions of the metal.

    METHOD FOR RECOVERING UNREACTED ACETONE IN PRODUCTION OF 2,2-BIS(4-HYDROXYPHENYL)PROPANE
    7.
    发明专利
    METHOD FOR RECOVERING UNREACTED ACETONE IN PRODUCTION OF 2,2-BIS(4-HYDROXYPHENYL)PROPANE 失效

    公开(公告)号：JPS62221650A

    公开(公告)日：1987-09-29

    申请号：JP6402786

    申请日：1986-03-24

    Applicant: MITSUI TOATSU CHEMICALS

    Inventor： NAKANISHI TAKEHISA ,  ONO YUZO ,  KITADO SHOJI ,  SAKAMOTO TOSHIHIKO

    IPC: C07C49/08 ,  C07C27/00 ,  C07C37/20 ,  C07C37/68 ,  C07C39/16 ,  C07C45/00 ,  C07C45/78 ,  C07C67/00

    Abstract: PURPOSE:To purifying the titled compound synthesized from acetone and phenol as raw materials, to recover unreacted acetone with small energy consumption, by feeding a mixture containing separated unreacted raw materials to a phenol process of cumene process. CONSTITUTION:Acetone is reacted with phenol in the presence of an insoluble acidic catalyst to give a reaction product, which is distilled D1 to give a column bottom solution comprising bisphenol A and phenol as main components and a column top distillate solution comprising unreacted acetone, water and accompanied phenol and the column bottom solution 5 is sent to a bisphenol A purifying process to give high-purity bisphenol A. The column top solution 4 is fed to a neutralization process N following a cumene hydroperoxide acid decomposition process A of phenol process of cumene process and/or a previous process of a liquid-liquid separation B2 of a washing process W and the unreacted acetone is recovered according to the phenol process of cumene process.

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