Preparation of acicular cobalt-containing magnetic iron oxide
    1.
    发明授权
    Preparation of acicular cobalt-containing magnetic iron oxide 失效
    针状钴磁性氧化铁的制备

    公开(公告)号:US5484628A

    公开(公告)日:1996-01-16

    申请号:US291559

    申请日:1994-08-16

    摘要: Acicular cobalt-containing magnetic iron oxides having a high coercive force and a core/shell structure and hence low temperature dependence of the coercive force are prepared by a process in which, in a first stage, surface activation is effected by means of iron(II) and cobalt ions under alkaline conditions on the iron oxide core under an inert gas atmosphere and thereafter, in a second stage, an epitactic coating of cobalt ferrite is applied, which coating is formed oxidatively from iron (II) and cobalt (II) hydroxide, likewise under alkaline reaction conditions. The total amount of cobalt ions used for doping remains unchanged compared with the known doped iron oxides or is even smaller. In the second process stage, the achievable coercive force can be controlled by the proportion of air in the gas mixture during the formation of the epitactic coating.

    摘要翻译: 通过一种方法制备具有高矫顽力和核/壳结构并因此矫顽力的低温依赖性的针状含钴磁性氧化铁,其中在第一阶段中,通过铁(II)进行表面活化 )和钴离子在碱性条件下在惰性气体气氛下在氧化铁芯上,然后在第二阶段施加钴铁氧体的中空涂层,该涂层由铁(II)和氢氧化钴(II)氧化形成 ,同样在碱性反应条件下。 用于掺杂的钴离子的总量与已知的掺杂的氧化铁相比保持不变,或甚至更小。 在第二工艺阶段,可以通过在形成外延涂层期间气体混合物中的空气比例来控制可实现的矫顽力。

    Acicular cobalt-modified iron oxides and their preparation
    4.
    发明授权
    Acicular cobalt-modified iron oxides and their preparation 失效
    精氨酸改性铁氧化物及其制备

    公开(公告)号:US5183709A

    公开(公告)日:1993-02-02

    申请号:US507765

    申请日:1990-05-21

    摘要: Acicular, cobalt-modified iron oxides consisting of a core of an iron oxide of the formula FeO.sub.x where x is from 1.33 to 1.5 and a ferrite shell which contains a total amount of from 0.4 to 12% by weight of cobalt ions and not more than 5% by weight of iron(II) ions, the percentages being based on the total amount of the material, which iron oxides have improved aging resistance, particularly with regard to the coercive forces, and a process for their preparation.

    摘要翻译: 针状,由铁FeOx的氧化铁核心组成的钴改性的氧化铁,其中x为1.33至1.5,铁氧体壳含有总计为0.4-12重量%的钴离子且不大于 5重量%的铁(II)离子,其百分比基于材料的总量,其中铁氧化物具有改善的耐老化性,特别是关于矫顽力,以及它们的制备方法。

    Ferromagnetic pigments
    5.
    发明授权
    Ferromagnetic pigments 失效
    铁磁颜料

    公开(公告)号:US6024890A

    公开(公告)日:2000-02-15

    申请号:US101557

    申请日:1998-07-13

    IPC分类号: G11B5/706 H01F1/047 H01F1/06

    摘要: The present invention relates to phosphorus-containing ferromagnetic pigments comprising, in particular, from 30 to 70% by volume of a core, said core comprising essentially iron and cobalt, and from 30 to 70% of a shell, said shell comprising essentially aluminum, phosporus, silicon, oxygen, and optionally magnesium and sodium; the invention further relates to a process for preparation of said pigments, their use in magnetic recording materials and magnetic recording materials which contain such pigments.

    摘要翻译: PCT No.PCT / EP97 / 00062 Sec。 371日期1998年7月13日第 102(e)日期1998年7月13日PCT 1997年1月9日PCT PCT。 公开号WO97 / 26666 日期1997年7月24日本发明涉及含铁铁磁性颜料,其特别包含30至70体积%的芯,所述芯基本上包含铁和钴,以及30-70%的壳,所述 壳基本上包括铝,磷,硅,氧,以及任选的镁和钠; 本发明还涉及制备所述颜料的方法,它们在磁记录材料中的应用和含有这种颜料的磁记录材料。

    Process for the selective preparation of light olefins
    9.
    发明授权
    Process for the selective preparation of light olefins 失效
    选择性制备轻质烯烃的方法

    公开(公告)号:US08461219B2

    公开(公告)日:2013-06-11

    申请号:US12950646

    申请日:2010-11-19

    IPC分类号: C07C27/00

    摘要: Process for preparing olefins, which comprises the following steps: a) preparation of a synthesis gas comprising carbon monoxide and hydrogen, b) introduction of carbon dioxide recirculated from step d) into the synthesis gas during or after the preparation of synthesis gas as per step a), c) conversion of the synthesis gas having a hydrogen to carbon monoxide ratio of ≦1.2:1 which is obtained in step b) into olefins in the presence of a Fischer-Tropsch catalyst, d) removal of the carbon dioxide comprised in the reaction product from step c), where the ratio of hydrogen to carbon monoxide in step c) is set via step b).

    摘要翻译: 制备烯烃的方法,其包括以下步骤:a)制备包含一氧化碳和氢气的合成气,b)根据步骤在合成气制备期间或之后将从步骤d)再循环的二氧化碳引入合成气中 a),c)在费 - 托催化剂存在下,将步骤b)中获得的氢气与一氧化碳比为1.2:1的合成气转化为烯烃; d)除去包含在二氧化碳 步骤c)中的反应产物,其中通过步骤b)设定步骤c)中的氢与一氧化碳的比例。