Preparation of acrolein or acrylic acid or a mixture thereof from propane
    62.
    发明申请
    Preparation of acrolein or acrylic acid or a mixture thereof from propane 有权
    从丙烷制备丙烯醛或丙烯酸或其混合物

    公开(公告)号:US20060004226A1

    公开(公告)日:2006-01-05

    申请号:US11131248

    申请日:2005-05-18

    IPC分类号: C07C51/25

    摘要: A process for preparing acrolein or acrylic acid or a mixture thereof from propane, in which the propane is initially dehydrogenated under heterogeneous catalysis to give propene, secondary components are removed and the remaining gas mixture, comprising propane and propene, is subjected to the heterogeneously catalyzed partial oxidation to acrolein or acrylic acid or a mixture thereof as the target product, target product is removed from the product gas mixture and the remaining residual gas, comprising excess oxygen and unconverted propane, is recycled into the propane dehydrogenation in such a way that the other propane fed to the dehydrogenation is at least partly converted under dehydrogenating conditions at the recycle point.

    摘要翻译: 从丙烷制备丙烯醛或丙烯酸或其混合物的方法,其中丙烷最初在非均相催化下脱氢以得到丙烯,次要组分被除去,剩余的包含丙烷和丙烯的气体混合物经历非均相催化 部分氧化成丙烯醛或丙烯酸或其混合物作为目标产物,将目标产物从产物气体混合物中除去,剩余的包含过量氧气和未转化的丙烷的残余气体以这样的方式循环到丙烷脱氢中: 进料到脱氢的其它丙烷在再循环点的脱氢条件下至少部分转化。

    Method for carrying out the catalytic gas phase oxidation of propene to form acrylic acid
    63.
    发明授权
    Method for carrying out the catalytic gas phase oxidation of propene to form acrylic acid 失效
    进行催化气相氧化丙烯以形成丙烯酸的方法

    公开(公告)号:US06740779B1

    公开(公告)日:2004-05-25

    申请号:US10110227

    申请日:2002-04-22

    IPC分类号: C07C5702

    CPC分类号: C07C51/25 C07C57/04

    摘要: In a process for the two-stage catalytic gas-phase oxidation of propene to acrylic acid, the reaction gas starting mixture is passed, in a tube-bundle reactor, with a propene loading of ≧160 l (S.T.P.) of propene/l·h, first over a fixed catalyst bed 1 present in two successive temperature zones A, B and then over a fixed catalyst bed 2 which is housed either in one further temperature zone C or in two further temperature zones D, E, the temperature of the zone A being kept at a lower temperature than the zone B and the temperature of the zone D at a lower temperature than the zone E.

    摘要翻译: 在将丙烯二阶段催化气相氧化成丙烯酸的过程中,将反应气体起始混合物在管束反应器中以丙烯/丙烯的加入量为约160l(STP)/ 1h 首先在存在于两个连续的温度区域A,B中的固定的催化剂床1上,然后在固定的催化剂床2上,该固定的催化剂床2容纳在一个另外的温度区域C或两个另外的温度区域D,E中, A在比区域B低的温度下保持在比区域B低的温度和区域D的温度。

    Method for purifying acrylic acid and methacrylic acid
    64.
    发明授权
    Method for purifying acrylic acid and methacrylic acid 有权
    丙烯酸和甲基丙烯酸的纯化方法

    公开(公告)号:US06596901B1

    公开(公告)日:2003-07-22

    申请号:US09147484

    申请日:1999-01-08

    IPC分类号: C07C5142

    CPC分类号: C07C51/43 C07C57/04

    摘要: A process for preparing acrylic acid or methacrylic acid comprises (a) preparing a gaseous product mixture having essentially the composition of a reaction mixture of the catalytic gas phase oxidation of C3-/C4-alkanes, -alkenes, -alkanols and/or -alkanals and/or precursors thereof to form acrylic acid or methacrylic acid, characterized by (b) condensing said product mixture, (c) crystallizing acrylic acid or methacrylic acid from the solution obtained in step (b), and (d) removing the resulting crystals from the mother liquor.

    摘要翻译: 制备丙烯酸或甲基丙烯酸的方法包括(a)制备气态产物混合物,其基本上具有C3- / C4-烷烃, - 烯烃, - 烷醇和/或 - 烷烃的催化气相氧化反应混合物的组成 和/或其前体以形成丙烯酸或甲基丙烯酸,其特征在于(b)冷凝所述产物混合物,(c)从步骤(b)中获得的溶液中结晶丙烯酸或甲基丙烯酸,和(d)除去所得晶体 从母酒。

    Continuous recovery of (meth)acrylic acid
    65.
    发明授权
    Continuous recovery of (meth)acrylic acid 失效
    连续回收(甲基)丙烯酸

    公开(公告)号:US06413379B1

    公开(公告)日:2002-07-02

    申请号:US09362911

    申请日:1999-07-29

    IPC分类号: B01D334

    摘要: A process for the continuous recovery of (meth)acrylic acid from a liquid starting mixture containing (meth)acrylic acid, a high-boiling organic solvent and low boilers, medium boilers and high boilers is proposed, the mixture being separated into a first part-stream (a), which, in addition to (meth)acrylic acid, contains the low boilers and a part each of the medium boilers and high boilers, and a second part-stream (b), which contains the predominant part of the (meth)acrylic acid and is completely or virtually completely free of low boilers, and the (meth)acrylic acid being recovered from the part-stream (b).

    摘要翻译: 提出了从含有(甲基)丙烯酸,高沸点有机溶剂和低沸点,中等锅炉和高锅炉的液体起始混合物连续回收(甲基)丙烯酸的方法,将混合物分离成第一部分 流(a),除了(甲基)丙烯酸之外,其还包含低锅炉和中等锅炉和高锅炉的一部分,以及第二部分物流(b),其包含主要部分 (甲基)丙烯酸,完全或几乎完全不含低沸点物质,(甲基)丙烯酸从部分物流(b)回收。