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    Method for producing acrylic acid
    1.
    发明授权
    Method for producing acrylic acid 有权
    制备丙烯酸的方法

    公开(公告)号：US06433222B1

    公开(公告)日：2002-08-13

    申请号：US09764985

    申请日：2001-01-22

    申请人： Bernd Eck ,  Jörg Heilek ,  Volker Schliephake ,  Theo Proll ,  Klaus Bröllos ,  Otto Machhammer ,  Joachim Thiel

    发明人： Bernd Eck ,  Jörg Heilek ,  Volker Schliephake ,  Theo Proll ,  Klaus Bröllos ,  Otto Machhammer ,  Joachim Thiel

    IPC分类号： C07C5142

    CPC分类号： C07C51/43 ,  C07C57/04

    摘要： A process for the preparation of acrylic acid by: (a) preparation of a gaseous product mixture which essentially has the composition of a reaction mixture of catalytic gas-phase oxidation of C3-alkanes, C3-alkenes, C3-alkanols and/or C3-alkanals and/or intermediates thereof to acrylic acid, which comprises (b) condensation of the gaseous product mixture, (c) crystallization of the acrylic acid from the solution obtained in stage (b), with partial evaporation of the solution under reduced pressure, (d) isolation of the resulting crystals from the mother liquor, (e) recycling of at least a part of the mother liquor from stage (d) to stage (b) and (f) recycling of at least a part of the evaporated solution from stage (c) to stage (b).

    摘要翻译： 一种通过以下方法制备丙烯酸的方法：（a）制备气态产物混合物，其基本上具有C3-烷烃，C3-烯烃，C3-链烷醇和/或C3的催化气相氧化反应混合物的组成 - 烷醇和/或其中间体，其包括（b）气态产物混合物的冷凝，（c）丙烯酸从阶段（b）中获得的溶液中的结晶，在减压下部分蒸发溶液 ，（d）从母液中分离得到的晶体，（e）将至少一部分母液从阶段（d）再循环到阶段（b），和（f）将至少一部分蒸发的 从（c）阶段到（b）阶段的方案。

    Method for producing acrylic acid and methacrylic acid
    3.
    发明授权
    Method for producing acrylic acid and methacrylic acid 有权
    制备丙烯酸和甲基丙烯酸的方法

    公开(公告)号：US06448439B1

    公开(公告)日：2002-09-10

    申请号：US09508084

    申请日：2000-03-13

    申请人： Bernd Eck ,  Otto Machhammer ,  Theo Proll ,  Volker Schliephake ,  Joachim Thiel ,  Klaus Bröllos

    发明人： Bernd Eck ,  Otto Machhammer ,  Theo Proll ,  Volker Schliephake ,  Joachim Thiel ,  Klaus Bröllos

    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 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. The product is removed from the gaseous product mixture by a process comprising the following steps: (a) condensing said gaseous product mixture, (b) crystallizing acrylic acid or methacrylic acid from the solution obtained in step (a), (c) removing the resulting crystals from the mother liquor, and (d) recycling at least a portion of said mother liquor from step (c) into step (a).

    摘要翻译： 制备丙烯酸或甲基丙烯酸的方法包括制备气态产物混合物，其基本上具有C3- / C4-烷烃， - 烯烃， - 链烷醇和/或 - 烷烃和/或 - 烷烃的催化气相氧化反应混合物的组成和/或 其前体形成丙烯酸或甲基丙烯酸。 通过包括以下步骤的方法从气态产物混合物中除去产物：（a）冷凝所述气态产物混合物，（b）从步骤（a）中获得的溶液中结晶丙烯酸或甲基丙烯酸，（c） 从母液中得到的晶体，和（d）将来自步骤（c）的所述母液的至少一部分再循环到步骤（a）中。

    Method for purifying acrylic acid and methacrylic acid
    4.
    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

    申请人： Bernd Eck ,  Otto Machhammer ,  Theo Proll ,  Volker Schliephake ,  Klaus Joachim Müller-Engel

    发明人： Bernd Eck ,  Otto Machhammer ,  Theo Proll ,  Volker Schliephake ,  Klaus Joachim Müller-Engel

    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。

    Purification of acrylic acid and methacrylic acid
    5.
    发明授权
    Purification of acrylic acid and methacrylic acid 失效
    丙烯酸和甲基丙烯酸的纯化

    公开(公告)号：US5831124A

    公开(公告)日：1998-11-03

    申请号：US798138

    申请日：1997-02-12

    申请人： Otto Machhammer ,  Albrecht Dams ,  Bernd Eck ,  Theo Proll

    发明人： Otto Machhammer ,  Albrecht Dams ,  Bernd Eck ,  Theo Proll

    IPC分类号： C07C57/04 ,  C07C51/43 ,  C07C57/05 ,  C07C57/07 ,  C07C51/42

    CPC分类号： C07C51/43

    摘要： Acrylic acid or methacrylic acid is purified by (a) subjecting a mixture comprising the acrylic acid or methacrylic acid to a sharply defined separation process essentially in the absence of an organic solvent, with the composition of the phase in which the acrylic acid or methacrylic acid accumulates remaining essentially constant when the composition of the other phases participating in the mass transfer changes, then taking off this phase and (b) subjecting at least a part of the remaining phase from stage(a) to a less sharply defined separation process and (c) feeding one of the phases formed in stage (b) to the sharply defined separation process in stage (a). In addition, the invention provides a process for preparing acrylic acid or methacrylic acid which includes the abovementioned purification process.

    摘要翻译： 丙烯酸或甲基丙烯酸通过（a）基本上在不存在有机溶剂的情况下对包含丙烯酸或甲基丙烯酸的混合物进行急剧定义的分离过程来纯化，其中丙烯酸或甲基丙烯酸 当参与质量传递的其它相的组成发生变化时，剩下的基本上保持恒定，然后脱除该相，和（b）使来自阶段（a）的剩余相的至少一部分经受较不明确的分离过程和（ c）在步骤（a）中将阶段（b）中形成的相中的一个进料加入到明确限定的分离过程中。 此外，本发明提供一种制备丙烯酸或甲基丙烯酸的方法，其包括上述纯化方法。

    Purification of acrylic acid by crystallization by means of vacuum evaporation
    8.
    发明授权
    Purification of acrylic acid by crystallization by means of vacuum evaporation 失效
    通过真空蒸发结晶纯化丙烯酸

    公开(公告)号：US06414190B1

    公开(公告)日：2002-07-02

    申请号：US09357955

    申请日：1999-07-21

    申请人： Bernd Eck ,  Jörg Heilek ,  Volker Schliephake

    发明人： Bernd Eck ,  Jörg Heilek ,  Volker Schliephake

    IPC分类号： C70C5142

    CPC分类号： C07C51/43 ,  C07C57/04

    摘要： In a process for purifying acrylic acid by crystallization by means of vacuum evaporation, a solution which contains acrylic acid and water and may contain further components is crystallized by means of vacuum evaporation with formation of a liquid phase, consisting of a mother liquor containing more than 10% by weight of water and of the crystals, and a vapor phase, the vapor phase is introduced into a liquid material in a condensation zone with formation of a liquid condensation mixture, and the liquid condensation mixture is recycled at least partly to the condensation zone, the operating conditions in the condensation zone being established so that no solid is precipitated.

    摘要翻译： 在通过真空蒸发结晶纯化丙烯酸的方法中，含有丙烯酸和水并可含有其它组分的溶液通过真空蒸发结晶，形成液相，由含有多于 10重量％的水和晶体，以及气相，在形成液体冷凝混合物的冷凝区中将气相引入液体材料中，并将液体冷凝混合物至少部分地再循环至冷凝物 区域，建立冷凝区域中的操作条件，使得没有固体沉淀。

    Regulation of a wash column in a melt crystallization process
    9.
    发明授权
    Regulation of a wash column in a melt crystallization process 有权
    在熔融结晶过程中调节洗涤柱

    公开(公告)号：US07323016B2

    公开(公告)日：2008-01-29

    申请号：US10333721

    申请日：2001-07-27

    申请人： Jörg Heilek ,  Bernd Eck ,  Dieter Baumann

    发明人： Jörg Heilek ,  Bernd Eck ,  Dieter Baumann

    IPC分类号： C30B7/08

    CPC分类号： C07C51/43 ,  B01D9/0013 ,  B01D9/0036 ,  B01D9/004 ,  B01D9/0045 ,  C07C51/47 ,  C07C57/04

    摘要： The present invention relates to the use of an optical line detector for regulating the position of the wash front and/or of the build-up front of the crystal bed of a wash column in a melt crystallization process and a corresponding regulation method. The line detector, for example a CCD camera or a linear array of reflection probes, is arranged in such a way that optical properties of the crystal bed can be detected continuously in a region running parallel to the longitudinal axis of the wash column, this region covering the desired setpoint position of the wash front or of the build-up front.

    摘要翻译： 本发明涉及一种光线路检测器，用于在熔融结晶过程和相应的调节方法中调节洗涤柱的洗涤前沿和/或洗涤塔的积层前沿的位置。 线检测器，例如CCD照相机或反射探针的线性阵列被布置成使得可以在平行于洗涤塔的纵向轴线的区域中连续检测晶体床的光学性质，该区域 覆盖洗涤前部或堆积前部的所需设定点位置。