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    Acrylamid aqueous solution refining process
    1.
    发明授权
    Acrylamid aqueous solution refining process 失效
    丙烯酰胺水溶液精制工艺

    公开(公告)号：US3923741A

    公开(公告)日：1975-12-02

    申请号：US31233772

    申请日：1972-12-05

    Applicant: MITSUI TOATSU CHEMICALS

    Inventor： ASANO SHIRO ,  YOSHIMURA KIYOTAKA ,  TSUCHIYA RYOJI ,  HONDA TADATOSHI

    IPC: C07C233/09 ,  C07C103/08

    CPC classification number: C07C233/09

    Abstract: There is disclosed an acrylamide aqueous solution refining process wherein an acrylamide aqueous solution obtained through a catalytic hydration process etc. is distilled to remove acrylonitrile when necessary; then is treated with active carbon, which has been arranged to adsorb cupric ion before use so that the polymerization of acrylamide that tends to take place around active carbon can be prevented thereby; and, if necessary, deionization is carried out by means of ion-exchange resin.

    Abstract translation: 公开了丙烯酰胺水溶液精制方法，其中通过催化水合方法等获得的丙烯酰胺水溶液在需要时蒸馏除去丙烯腈; 然后用活性炭处理，其被布置成在使用前吸附铜离子，从而可以防止倾向于在活性炭周围发生的丙烯酰胺的聚合; 并且如果需要，通过离子交换树脂进行去离子。

    Method for concentrating an acrylamide aqueous solution
    2.
    发明授权
    Method for concentrating an acrylamide aqueous solution 失效
    浓缩丙烯酰胺水溶液的方法

    公开(公告)号：US3917693A

    公开(公告)日：1975-11-04

    申请号：US31183072

    申请日：1972-12-04

    Applicant: MITSUI TOATSU CHEMICALS

    Inventor： ASANO SHIRO ,  YOSHIMURA KIYOTAKA ,  TSUCHIYA RYOJI ,  HONDA TADATOSHI

    IPC: C07C231/00 ,  C07C67/00 ,  C07C231/06 ,  C07C231/24 ,  C07C233/09 ,  C07C103/08

    CPC classification number: C07C233/09

    Abstract: A method for economically concentrating an acrylamide aqueous solution by catalytic hydration without substantial deterioration in the product. According to the method, an acrylamide aqueous solution obtained from catalytic hydration, is concentrated by distillation while maintaining the solution in good contact with at least 0.1 mole. or more of air per mole. of water distilled from the acrylamide aqueous solution.

    Abstract translation: 通过催化水合而经济地浓缩丙烯酰胺水溶液的方法，而不会使产物显着劣化。 根据该方法，通过蒸馏浓缩由催化水合获得的丙烯酰胺水溶液，同时保持溶液与至少0.1摩尔良好的接触。 或更多的空气。 从丙烯酰胺水溶液中蒸馏出的水。

    5.
    发明专利
    未知

    公开(公告)号：AT99284T

    公开(公告)日：1994-01-15

    申请号：AT87101559

    申请日：1987-02-05

    Applicant: MITSUI TOATSU CHEMICALS

    Inventor： ASANO SHIRO ,  SHIZUKA KOHEI ,  KAMBARA YOSHIHIKO

    IPC: C07B61/00 ,  B01J23/00 ,  B01J23/72 ,  C07C67/00 ,  C07C231/00 ,  C07C231/06 ,  C07C233/09

    Abstract: Disclosed is a method for stopping and starting a reactor equipped with a heat exchanger, a catalyst settler, a catalyst filter and the like, which method is suitable for use in a process for the preparation of acrylamide by reacting acrylonitrile with water in the presence of a metallic copper-based catalyst used as a suspended bed. According to this method, various undesired phenomena which may occur at the beginning of operation can be prevented by discharging the metallic copper-based catalyst until the total amount of metallic copper and copper oxides present in the catalyst remaining in the reactor is not greater than a certain level based on the amount of metallic copper catalyst used at the beginning of the operation, or by discharging the catalyst until the amount of copper oxides is not greater than a certain level and then establishing an inert environment within the reactor.

    PROCESS FOR THE SYNTHESIS OF ACRYLAMIDE
    7.
    发明专利
    PROCESS FOR THE SYNTHESIS OF ACRYLAMIDE 未知

    公开(公告)号：IN165826B

    公开(公告)日：1990-01-20

    申请号：IN79CA1987

    申请日：1987-01-27

    Applicant: MITSUI TOATSU CHEMICALS

    Inventor： ASANO SHIRO ,  SHIZUKA KOHEI ,  KAMBARA YOSHIHIKO

    IPC: C07B61/00 ,  B01J23/00 ,  B01J23/72 ,  C07C67/00 ,  C07C231/00 ,  C07C231/06 ,  C07C233/09 ,  C07C87/00

    Abstract: Disclosed is a method for stopping and starting a reactor equipped with a heat exchanger, a catalyst settler, a catalyst filter and the like, which method is suitable for use in a process for the preparation of acrylamide by reacting acrylonitrile with water in the presence of a metallic copper-based catalyst used as a suspended bed. According to this method, various undesired phenomena which may occur at the beginning of operation can be prevented by discharging the metallic copper-based catalyst until the total amount of metallic copper and copper oxides present in the catalyst remaining in the reactor is not greater than a certain level based on the amount of metallic copper catalyst used at the beginning of the operation, or by discharging the catalyst until the amount of copper oxides is not greater than a certain level and then establishing an inert environment within the reactor.

    PREPARATION PROCESS OF ACRYLAMIDE CRYSTALS
    8.
    发明专利
    PREPARATION PROCESS OF ACRYLAMIDE CRYSTALS 未知

    公开(公告)号：ZA862861B

    公开(公告)日：1986-12-30

    申请号：ZA862861

    申请日：1986-04-16

    Applicant: MITSUI TOATSU CHEMICALS

    Inventor： KAMBARA YOSHIHIKO ,  ASANO SHIRO ,  ISOZAKI WATARU ,  KITADO SYOJI ,  YAMAGUCHI MASAO

    IPC: C07C231/24 ,  B01D9/00 ,  B01D9/02 ,  C07C20060101 ,  C07C67/00 ,  C07C231/00 ,  C07C233/09 ,  C08J3/12 ,  C07C

    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.

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