Method for the production of maleic anhydride
    62.
    发明申请
    Method for the production of maleic anhydride 失效
    马来酸酐生产方法

    公开(公告)号:US20060241309A1

    公开(公告)日:2006-10-26

    申请号:US10565889

    申请日:2004-07-06

    IPC分类号: C07D307/34

    CPC分类号: C07C51/215 C07C57/145

    摘要: A process for preparing maleic anhydride by oxidizing n-butane in the gas phase under heterogeneous catalysis with oxygen-containing gases over a vanadium-, phosphorus- and oxygen-containing catalyst in a reactor unit at a temperature in the range from 350 to 500° C., removing the maleic anhydride formed to form a gas stream which comprises unconverted n-butane and water and recycling at least a portion of the unconverted n-butane to the reactor unit, by feeding to the reactor unit an inlet stream having an n-butane concentration of from 0.5 to 1.5% by volume and an oxygen concentration of from 5 to 21% by volume, establishing a pressure at the inlet to the reactor unit of from 0.4 to 2 MPa abs, and converting from 40 to 100% of the n-butane from the inlet stream per reactor pass.

    摘要翻译: 在反应器单元中的含钒,含磷和氧的催化剂中,在350〜500℃的温度范围内,用含氧气体在非均相催化下,在气相中氧化正丁烷,制备马来酸酐的方法 C.去除形成的马来酸酐以形成包含未转化的正丁烷和水的气流,并将未转化的正丁烷的至少一部分再循环到反应器单元,通过向反应器单元供给具有n - 丁烷浓度为0.5至1.5体积%,氧浓度为5至21体积%,在反应器单元入口处建立压力为0.4至2MPa abs,并将40至100% 来自每个反应器的入口流的正丁烷通过。

    Method for carrying out the catalytic gas phase oxidation of propene to form acrylic acid
    64.
    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
    65.
    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
    66.
    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。