知搜-全球专利检索

  1. 登录
  2. 注册

搜索结果

3 条记录 (耗时 0.025 秒)

    METHOD FOR PRODUCING OXIDE CATALYST AND METHOD FOR PRODUCING UNSATURATED NITRILE
    1.
    发明申请
    METHOD FOR PRODUCING OXIDE CATALYST AND METHOD FOR PRODUCING UNSATURATED NITRILE 审中-公开

    公开(公告)号：US20190232270A1

    公开(公告)日：2019-08-01

    申请号：US16332732

    申请日：2017-09-08

    申请人： ASAHI KASEI KABUSHIKI KAISHA

    发明人： Eri TATENO ,  Minoru KADOWAKI

    IPC分类号： B01J37/08 ,  B01J37/03 ,  B01J37/04 ,  B01J23/00 ,  B01J37/00 ,  C07C253/24

    CPC分类号： B01J37/08 ,  B01J23/002 ,  B01J23/30 ,  B01J37/0027 ,  B01J37/031 ,  B01J37/04 ,  B01J2523/00 ,  B01J2523/3706 ,  B01J2523/3712 ,  B01J2523/3787 ,  B01J2523/44 ,  B01J2523/55 ,  B01J2523/56 ,  B01J2523/68 ,  B01J2523/69 ,  C07B61/00 ,  C07C51/215 ,  C07C253/24 ,  C07C255/08 ,  Y02P20/52 ,  B01J2523/53 ,  C07C57/04

    摘要： A method for producing an oxide catalyst according to the present invention is a method for producing an oxide catalyst containing Mo, V, Sb, and Nb, the method including: a raw material preparation step of obtaining an aqueous mixed liquid containing Mo, V, Sb, and Nb; an aging step of subjecting the aqueous mixed liquid to aging at more than 30° C.; a drying step of drying the aqueous mixed liquid, thereby obtaining a dried powder; and a calcination step of calcining the dried powder, thereby obtaining the oxide catalyst, wherein, in the raw material preparation step and/or the aging step, precipitation of Nb is facilitated by performing at least one operation selected from the group consisting of the following (I) to (III): (I) in the raw material preparation step, the aqueous mixed liquid is prepared by mixing a Nb raw material liquid containing Nb with a MoVSb raw material liquid containing Mo, V, and Sb, wherein ammonia is added to at least one of the MoVSb raw material liquid, the Nb raw material liquid, and the aqueous mixed liquid such that a molar ratio in terms of NH3/Nb in the aqueous mixed liquid is adjusted to be 0.7 or more, and in the aging step, a temperature of the aqueous mixed liquid is adjusted to more than 50° C.; (II) in the aging step, a temperature of the aqueous mixed liquid is adjusted to more than 65° C.; and (III) in the raw material preparation step, the aqueous mixed liquid is prepared by mixing a Nb raw material liquid containing Nb with a MoVSb raw material liquid containing Mo, V, and Sb, wherein a molar ratio in terms of H2O2/Nb in the Nb raw material liquid is adjusted to less than 0.2, and in the aging step, a temperature of the aqueous mixed liquid is adjusted to more than 50° C.

    METHOD FOR PRODUCING OXIDE CATALYST AND METHOD FOR PRODUCING UNSATURATED NITRILE
    2.
    发明申请
    METHOD FOR PRODUCING OXIDE CATALYST AND METHOD FOR PRODUCING UNSATURATED NITRILE 审中-公开

    公开(公告)号：US20190143304A1

    公开(公告)日：2019-05-16

    申请号：US16305782

    申请日：2017-07-28

    申请人： ASAHI KASEI KABUSHIKI KAISHA

    发明人： Eri TATENO ,  Minoru KADOWAKI

    IPC分类号： B01J23/00 ,  B01J37/12 ,  B01J37/04 ,  B01J37/08 ,  C07C253/26

    摘要： A method for producing an oxide catalyst containing Mo, V, Sb, and Nb, the method including: a raw material preparation step including sub-step (I) of preparing an aqueous mixed liquid (A) containing Mo, V, and Sb, sub-step (II) of adding hydrogen peroxide to the aqueous mixed liquid (A), thereby facilitating oxidation of the aqueous mixed liquid (A) and obtaining an aqueous mixed liquid (A′), and sub-step (III) of mixing the aqueous mixed liquid (A′) and a Nb raw material liquid (B), thereby obtaining an aqueous mixed liquid (C); a drying step of drying the aqueous mixed liquid (C), thereby obtaining a dried powder; and a calcination step of calcining the dried powder under an inert gas atmosphere, wherein a time elapsed from addition of the hydrogen peroxide to the aqueous mixed liquid (A) to mixing the Nb raw material liquid (B) therewith is less than 5 minutes and the aqueous mixed liquid (A′) before being subjected to the sub-step (III) has an oxidation-reduction potential of 150 to 350 mV.