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    Method for esterifying (meth)acrylic acid with alkanol
    1.
    发明专利
    Method for esterifying (meth)acrylic acid with alkanol 有权
    用丙烯醇酯化（甲基）丙烯酸的方法

    公开(公告)号：JP2007145857A

    公开(公告)日：2007-06-14

    申请号：JP2007024607

    申请日：2007-02-02

    Applicant: Basf Ag ,  ビーエーエスエフ アクチェンゲゼルシャフトBASF Aktiengesellschaft

    Inventor： AICHINGER HEINRICH DR ,  GEISENDOERFER MATTHIAS DR ,  HERBST HOLGER DR ,  NESTLER GERHARD DR

    IPC: C07C67/54 ,  C07B61/00 ,  C07C27/02 ,  C07C67/08 ,  C07C67/327 ,  C07C67/475 ,  C07C67/60 ,  C07C69/54

    CPC classification number: C07C67/327 ,  C07C67/08 ,  C07C67/60 ,  C07C69/54

    Abstract: PROBLEM TO BE SOLVED: To provide a method for esterifying (meth)acrylic acid with an alkanol in the presence of an esterifying catalyst, capable of performing the esterification economically and simply.
    SOLUTION: This method for esterifying (meth)acrylic acid is provided by separating unconverted starting materials and a formed (meth)acrylates by distillation to form a bottom product containing oxyesters, separating the bottom product, heating at 150-250°C in the presence of an acid, and adjusting pressure so as to directly evaporating cleaved products formed under the above condition from the oxyesters contained in the bottom product.
    COPYRIGHT: (C)2007,JPO&INPIT

    Abstract translation: 待解决的问题：提供一种在酯化催化剂存在下用烷醇酯化（甲基）丙烯酸的方法，其能够经济地和简单地进行酯化。 解决方案：通过蒸馏分离未转化的原料和形成的（甲基）丙烯酸酯，形成含有羟基酯的底部产物，分离底部产物，加热至150-250℃，提供该（甲基）丙烯酸酯化方法 在酸的存在下，调节压力，以直接蒸发在上述条件下形成的裂解产物从底部产物中含有的含氧酯。 版权所有（C）2007，JPO＆INPIT

    2.
    发明专利
    未知

    公开(公告)号：DE19803658A1

    公开(公告)日：1999-08-05

    申请号：DE19803658

    申请日：1998-01-30

    Applicant: BASF AG

    Inventor： PAULUS WOLFGANG DR ,  GEISENDOERFER MATTHIAS DR

    IPC: C07C67/08 ,  C07C67/52 ,  C07C67/58 ,  C07C67/62 ,  C07C69/54 ,  C07C69/533 ,  C07B63/04 ,  C02F1/56

    Abstract: Organic, polymeric, anionic, water-soluble flocculators are used in the phase separation of organic-aqueous systems containing essentially monomeric acrylates, diacrylates, (poly)ester- or (poly)ether-acrylates and unreacted residues of alcohols and carboxylic acids or anhydrides used for acrylate production. An Independent claim is also included for he production of acrylates by: (a) condensation of alcohol(s) with alpha , beta -unsaturated carboxylic acid(s) or anhydride(s) in organic media; and (b) washing the organic phase with an organic washing agent.

    3.
    发明专利
    未知

    公开(公告)号：DE19604253A1

    公开(公告)日：1997-08-07

    申请号：DE19604253

    申请日：1996-02-06

    Applicant: BASF AG

    Inventor： SCHMIDT WILLI ,  GEISENDOERFER MATTHIAS DR ,  DOCKNER TONI DR ,  HERBST HOLGER DR ,  NESTLER GERHARD DR ,  WECK ALEXANDER DIPL ING

    IPC: C07B61/00 ,  C07C67/08 ,  C07C67/54 ,  C07C69/54 ,  B01J31/02

    Abstract: In the continuous production of alkyl (meth)acrylates (AA) by reacting (meth)acrylic acid with 1-8 carbon (C) monohydric alkanols in homogeneous liquid phase, free from solvent, at elevated temperature and in the presence of an acid esterification catalyst; (a) (meth)acrylic acid, alkanol and catalyst are fed to a reaction zone; (b) during a residence time, the water formed is separated in a rectification unit (RU) III above the reaction zone; (c) the aqueous distillate is separated into an organic phase containing the alkanol and an aqueous phase; (d) the organic phase is recycled to RU III; and (e) the reaction mixture is discharged from the reaction zone and passed to another RU, where AA is separated by distillation. The novel features are that: (i) the molar ratio of (meth)acrylic acid and alkanol is 1:(0.75-2); (ii) the aqueous phase from RU III is partly recycled to RU III; (iii) the reaction mixture is passed to RU I, in which it is separated into a product (II) containing the catalyst and a product (I) containing AA, residual alkanol and residual (meth)acrylic acid; and (iv) (I) is passed to RU II, in which AA is separated from residual alkanol and residual (meth)acrylic acid and the alkanol and acid are recycled to the reaction zone. Preferably the alkanol is 2-ethylhexanol. The catalyst is para-toluenesulphonic acid (p-TSA) and/or other organic sulphonic acids, e.g. methane-, benzene- or dodecylbenzene-sulphonic acid, and/or sulphuric acid (H2SO4). The catalyst concentration in the reaction mixture is 0.1-10, especially 0.1-6 wt.% p-TSA in the reaction zone and 2.5-50 wt.% p-TSA in the sump or an equimolar amount of organic sulphonic acid and/or H2SO4. The reaction zone consists of a cascade of NOTLESS 2, especially 2-4 consecutive sections, especially reactors with circulating vapourisers. All rectification units are rectification columns.

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