公开(公告)号：CA1184937A

公开(公告)日：1985-04-02

申请号：CA380035

申请日：1981-06-17

Applicant: MITSUI TOATSU CHEMICALS

Inventor： ASANO SHIRO ,  SHIZUKA KOHEI ,  KAMBARA YOSHIHIKO ,  MIKAMI JUNJI ,  KATO HIROSHI ,  HONDA TADATOSHI

IPC: C07C231/24 ,  B01J23/00 ,  C07C233/09 ,  C07C253/34 ,  C08F20/52 ,  C08F120/56 ,  C07C103/133

Abstract: TITLE OF THE INVENTION PROCESS FOR PURIFYING AN AQUEOUS SOLUTION OF ACRYLAMIDE An aqueous solution of acrylamide obtained by catalytic hydration of acrylonitrile in the presence of a copper-based catalyst is purified by the steps, in sequence, of (a) removal of the unreacted acrylonitrile, (b) removal of copper, (c) treatment under basic conditions, (d) cation exchanging treatment and (e) weakly basic anion exchanging treatment. The acrylamide obtained by this process has good storage stability. An acrylamide polymer produced from this monomer is useful as a flocculant having a reduced content of the unreacted monomer, a high molecular weight and excellent solubility in water.

公开(公告)号：DE3123037A1

公开(公告)日：1982-03-18

申请号：DE3123037

申请日：1981-06-10

Applicant: MITSUI TOATSU CHEMICALS

Inventor： ASANO SHIRO

IPC: C07C231/06 ,  B01J23/00 ,  B01J23/72 ,  C07C67/00 ,  C07C231/00 ,  C07C233/09 ,  C07C103/133 ,  C07C102/08

Abstract: In a process for producing acrylamide by hydrating acrylonitrile in the presence of a copper-based catalyst, the reaction is carried out in the presence of 30 to 10,000 ppm of acetone in the reaction solution. According to this process, the activity of the copper-based catalyst is maintained and the economic advantage of acrylamide production is enhanced.

公开(公告)号：AU6976774A

公开(公告)日：1975-12-04

申请号：AU6976774

申请日：1974-06-04

Applicant: MITSUI TOATSU CHEMICALS

Inventor： YOSHIMURA KIYOTAKA ,  HASHIMOTO MASAO ,  ASANO SHIRO

IPC: C07D213/82 ,  B01J23/00 ,  B01J23/72 ,  B01J25/00 ,  B01J27/00 ,  B01J27/24 ,  C07B61/00 ,  C07C67/00 ,  C07C231/00 ,  C07C231/06 ,  C07C233/09 ,  C07D213/81 ,  C07C103/08 ,  C07C103/10 ,  C07D31/44 ,  B01J11/28 ,  C07C103/19 ,  C07C103/22

Abstract: An improved process for converting acrylonitrile to the corresponding amide by hydrating said nitrile in the presence of a metallic copper catalyst and aluminum nitrate as promoter for said catalyst.

公开(公告)号：DE3579280D1

公开(公告)日：1990-09-27

申请号：DE3579280

申请日：1985-09-19

Applicant: MITSUI TOATSU CHEMICALS

Inventor： ASANO SHIRO ,  KITAGAWA JUN

IPC: C07D213/82 ,  B01J25/00 ,  C07B31/00 ,  C07B43/06 ,  C07B61/00 ,  C07C67/00 ,  C07C231/00 ,  C07C231/06 ,  C07C231/08 ,  C07C233/09 ,  C07D213/81 ,  C07D233/00

Abstract: Disclosed herein is a process for the hydration of a nitrile compound. Owing to the use of a Raney copper catalyst having an iron content of 0.7 wt. % or less based on the copper component in a suspended state, the process allows the catalyst to retain high activity and facilitates the separation of the catalyst and liquid reaction mixture by sedimentalion and/or filtration. In an example, a catalyst with 0.1 iron achieved 67% conversion of acrylonitrile to acrylamide, whereas a catalyst with 1.56% iron achieved only 40%.

公开(公告)号：AU583900B2

公开(公告)日：1989-05-11

申请号：AU5493286

申请日：1986-03-20

Applicant: MITSUI TOATSU CHEMICALS

Inventor： ASANO SHIRO ,  TOKUNAGA MAREO ,  KAMBARA YOSHIHIKO

IPC: C07B61/00 ,  A61K31/33 ,  A61K31/435 ,  A61K31/495 ,  A61P31/04 ,  B01J25/00 ,  C07C67/00 ,  C07C231/00 ,  C07C231/06 ,  C07C233/09 ,  C07D20060101 ,  C07D213/61 ,  C07D213/77 ,  C07D213/78 ,  C07D213/80 ,  C07D471/04 ,  C07C102/08 ,  C07C103/133

Abstract: A catalyst useful in the practice of a process, in which (meth)acrylamide is prepared through the hydration reaction between (meth)acrylonitrile and water in a suspended liquid-phase bed of a Raney copper catalyst, has been obtained by leaching a Raney copper alloy in the presence of the Raney copper catalyst which has been deteriorated. The above useful catalyst has higher performances, compared with a catalyst obtained by conventionally leaching the Raney copper alloy alone, has satisfactory handling properties in settling and filtering, and can significantly reduced the amount of catalyst to be discarded.

公开(公告)号：AU566701B2

公开(公告)日：1987-10-29

申请号：AU6820487

申请日：1987-02-02

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 ,  C07C102/08 ,  C07C103/133

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.

公开(公告)号：AU561379B2

公开(公告)日：1987-05-07

申请号：AU4730985

申请日：1985-09-10

Applicant: MITSUI TOATSU CHEMICALS

Inventor： ASANO SHIRO ,  KITAGAWA JUN

IPC: C07D213/82 ,  B01J25/00 ,  C07B31/00 ,  C07B43/06 ,  C07B61/00 ,  C07C67/00 ,  C07C231/00 ,  C07C231/06 ,  C07C231/08 ,  C07C233/09 ,  C07D213/81 ,  C07D233/00 ,  C07C102/08

Abstract: Disclosed herein is a process for the hydration of a nitrile compound. Owing to the use of a Raney copper catalyst having an iron content of 0.7 wt. % or less based on the copper component in a suspended state, the process allows the catalyst to retain high activity and facilitates the separation of the catalyst and liquid reaction mixture by sedimentalion and/or filtration. In an example, a catalyst with 0.1 iron achieved 67% conversion of acrylonitrile to acrylamide, whereas a catalyst with 1.56% iron achieved only 40%.

公开(公告)号：ZA8602861B

公开(公告)日：1986-12-30

申请号：ZA8602861

申请日：1986-04-16

Applicant: MITSUI TOATSU CHEMICALS

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

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

公开(公告)号：BR8601844A

公开(公告)日：1986-12-23

申请号：BR8601844

申请日：1986-04-24

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 ,  C07C103/133

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.

公开(公告)号：AU4730985A

公开(公告)日：1986-03-27

申请号：AU4730985

申请日：1985-09-10

Applicant: MITSUI TOATSU CHEMICALS

Inventor： ASANO SHIRO ,  KITAGAWA JUN

IPC: C07D213/82 ,  B01J25/00 ,  C07B31/00 ,  C07B43/06 ,  C07B61/00 ,  C07C67/00 ,  C07C231/00 ,  C07C231/06 ,  C07C231/08 ,  C07C233/09 ,  C07D213/81 ,  C07D233/00 ,  C07C102/08

Abstract: Disclosed herein is a process for the hydration of a nitrile compound. Owing to the use of a Raney copper catalyst having an iron content of 0.7 wt. % or less based on the copper component in a suspended state, the process allows the catalyst to retain high activity and facilitates the separation of the catalyst and liquid reaction mixture by sedimentalion and/or filtration. In an example, a catalyst with 0.1 iron achieved 67% conversion of acrylonitrile to acrylamide, whereas a catalyst with 1.56% iron achieved only 40%.