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    PURIFICATION OF AQUEOUS ACRYLAMIDE
    1.
    发明专利
    PURIFICATION OF AQUEOUS ACRYLAMIDE 失效

    公开(公告)号：JPS577452A

    公开(公告)日：1982-01-14

    申请号：JP8138480

    申请日：1980-06-18

    Applicant: MITSUI TOATSU CHEMICALS

    Inventor： ASANO SHIROU ,  SHIZUKA KOUHEI ,  KANBARA YOSHIHIKO ,  MIKAMI JIYUNJI ,  KATOU HIROSHI ,  HONDA TADATOSHI

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

    Abstract: PURPOSE:Acrylonitrile is catalytically hydrated in the presence of a copper catalyst to form an aqueous solution of crude acrylamide, which is treated specifically to produce the titled compound of high quality used for high-molecular acrylamide polymer. CONSTITUTION:The catalytic hydration of acrylonitrile is conducted in the presence of a copper catalyst such as a copper wire, copper powder, i.e., elementary copper, to form an aqueous solution of crude acrylamide. The resultant aqueous solution is treated as follows in order: (A) substantially all the unreacted acrylonitrile is distilled off, (B) the copper is substantially removed, (C) the product is kept basic and stood, (D) treated with a cation-exchange resin, and (E) with a weak base anion- exchange resin, to give the titled compound. EFFECT:When necessary, the polymerization of acrylamide in the aqueous solution is inhibited. The product is readily soluble in water. The content of the unreacted acrylonitrile is trace, less than 0.2wt%.

    SYNTHESIZING METHOD OF ACRYLAMIDE
    2.
    发明专利
    SYNTHESIZING METHOD OF ACRYLAMIDE 失效

    公开(公告)号：JPS574951A

    公开(公告)日：1982-01-11

    申请号：JP7715380

    申请日：1980-06-10

    Applicant: MITSUI TOATSU CHEMICALS

    Inventor： ASANO SHIROU

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

    Abstract: PURPOSE:To obtain the titled compound useful as an agent for paper making, coagulant, a petroleum recovering agent and a soil solidifying agent, by hydrating acrylonitrile in the presence of a copper catalyst and a specific amount of acetone. CONSTITUTION:Acrylonitrile is hydrated in the presence of a copper catalyst, e.g. a combination of copper in the form of a copper wire or copper powder with copper ions, reduced copper or electrolytic copper, at a weight ratio between the acrylonitrile and the water of preferably 60:40-5:95 to give acrylamide. In the process, acetone is present in an amount of 30-10,000ppm, and the reaction temperature is preferably 70-150 deg.C. The catalyst os kept away from contact with oxygen and a gas containing oxygen before and during use thereof.

    SYNTHESIS OF ACRYLAMIDE
    3.
    发明专利
    SYNTHESIS OF ACRYLAMIDE 失效

    公开(公告)号：JPS577453A

    公开(公告)日：1982-01-14

    申请号：JP8139780

    申请日：1980-06-18

    Applicant: MITSUI TOATSU CHEMICALS

    Inventor： ASANO SHIROU ,  MIKAMI JIYUNJI ,  KATOU HIROSHI

    IPC: C07C231/06 ,  B01J23/00 ,  B01J23/72 ,  B01J25/00 ,  C07C67/00 ,  C07C231/00 ,  C07C233/09

    Abstract: PURPOSE:Acrylonitrile is catalytically hydrated in the presence of a copper catalyst to produce the titled compound of high quality that can make a stable aqueous solution and is used for high-molecular acrylamide polymers. CONSTITUTION:In the presence of a copper catalyst such as metallic copper in the form of a powder of wire, acrylonitrile, which is previously extracted with water or subjected to extractive distillation with water to reduce acetonitrile content to less than 20ppm, is catalytically hydrated in a temperature range 100-140 deg.C. Then, the product is purified by treating with a cation exchange resin to give the titled compound. The preferably weight ratio of acrylonitrile to water is 60:40-5:95. EFFECT:The content of the unreacted acrylamide monomer, which is toxic, is reduced to less than 0.2wt% in the polymer.

    PURIFICATION OF AQUEOUS ACRYLAMIDE
    5.
    发明专利
    PURIFICATION OF AQUEOUS ACRYLAMIDE 失效

    公开(公告)号：JPS5562054A

    公开(公告)日：1980-05-10

    申请号：JP13316778

    申请日：1978-10-31

    Applicant: MITSUI TOATSU CHEMICALS

    Inventor： ASANO SHIROU ,  SHIZUKA KOUHEI ,  KANBARA YOSHIHIKO

    IPC: B01J23/72 ,  B01J23/00 ,  C07C67/00 ,  C07C231/00 ,  C07C231/06 ,  C07C231/24 ,  C07C233/09 ,  C08F20/06 ,  C08F20/52 ,  C08F20/56

    Abstract: PURPOSE:In the production of acrylamide by hydration of acrylonitrile in the presence of a copper catalyst, the aqueous acrylamide resulting from the hydration is treated with a permeation membrane to remove steadily impurities hard separable and purified. CONSTITUTION:In the presence of a copper catalyst, acrylonitrile is hydrated to form aqueous acrylamide. The aqueous acrylamide is, when necessary, previously the copper is removed, treated with a permeation membrane, or is subjected to the treatment for removing copper, simultaneously or thereafter anionically exchanged, then treated with a permeation membrane. The membrane for permeation treatment is preferably made of cellulose acetate or aromatic polyamide.

    CATION EXCHANGE TREATING METHOD FOR AQUEOUS SOLUTION OF ACRYLAMIDE
    8.
    发明专利
    CATION EXCHANGE TREATING METHOD FOR AQUEOUS SOLUTION OF ACRYLAMIDE 失效

    公开(公告)号：JPS574952A

    公开(公告)日：1982-01-11

    申请号：JP7904980

    申请日：1980-06-13

    Applicant: MITSUI TOATSU CHEMICALS

    Inventor： ASANO SHIROU ,  MIKAMI JIYUNJI ,  SAITOU JIYUN ,  HONDA TADATOSHI

    IPC: B01J39/04 ,  C07C67/00 ,  C07C231/00 ,  C07C231/06 ,  C07C231/24 ,  C07C233/09

    Abstract: PURPOSE:To purify an aqueous solution of the titled compound useful for an agent for paper making, by adjusting the content of 2-cyanoethyl acrylate in an aqueous solution of acrylamide obtained by hydrating acrylonitrile in the presence of a copper catalyst. CONSTITUTION:Acrylonitrile is hydrated in the presence of a copper catalyst, e.g. a combination of copper in the form of a copper wire and copper powder with copper ions, reduced copper or electrolytic copper or Raney nickel, at a weight ratio between the acrylonitirle and the water of preferably 60:40-5:95 to give an aqueous solution of acrylamide. The content of 2-cyanoethyl acrylate in the aqueous solution is previously adjusted to 20ppm or less based on the acrylamide, and the aqueous solution of the acrylamide is then treated with a cation exchage resin to purify the aqueous solution of the acrylamide. The reaction temperature is preferably 70- 150 deg.C.

    SYNTHESIS OF ACRYLAMIDE
    9.
    发明专利
    SYNTHESIS OF ACRYLAMIDE 失效

    公开(公告)号：JPS572251A

    公开(公告)日：1982-01-07

    申请号：JP7668780

    申请日：1980-06-09

    Applicant: MITSUI TOATSU CHEMICALS

    Inventor： ASANO SHIROU

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

    Abstract: PURPOSE:To obtain acrylamide in high purity as a raw material for preparing a high-molecular weight polymer especially useful as a coagulant, by hydrating acrylonitrile having not more than a specific ratio of impurity acetone content in the presence of a copper type catalyst. CONSTITUTION:Acrylonitrile containing =10,000,000, which is especially used as a coagulant, etc.

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