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    11.
    发明专利
    未知

    公开(公告)号：DE10063176A1

    公开(公告)日：2002-06-20

    申请号：DE10063176

    申请日：2000-12-18

    Applicant: BASF AG

    Inventor： MARTIN FRIEDRICH-GEORG ,  NESTLER GERHARD ,  SCHROEDER JUERGEN

    IPC: C07C67/08 ,  C07C67/62 ,  C07C69/54 ,  C07C67/54

    Abstract: The invention relates to a method for producing (meth)acrylic acid esters by transesterification of the (meth)acrylic acid with an alkanol in the presence of an acid catalyst, a polymerization inhibitor and an organic solvent that forms an azeotropic mixture with water. The reaction mixture is heated to the boiling point of the mixture in a reactor that comprises a distillation unit with a column and a condenser. The azeotropic mixture is distilled off, the organic solvent is returned to the column as reflux and at least a part of the column reflux is contacted with copper or a copper-containing material. The inventive method is advantageous in that substantially no polymerizate is produced in the distillation column.

    Multimetal oxide composition, useful as oxidation catalyst, especially for gas phase production of (meth)acrylic acid, is based on crystallites of constant composition
    12.
    发明专利
    Multimetal oxide composition, useful as oxidation catalyst, especially for gas phase production of (meth)acrylic acid, is based on crystallites of constant composition 未知

    公开(公告)号：DE19922156A1

    公开(公告)日：2000-08-10

    申请号：DE19922156

    申请日：1999-05-12

    Applicant: BASF AG

    Inventor： MARTIN FRIEDRICH-GEORG ,  KOHL VERONIKA ,  COX GERHARD

    IPC: B01J23/00 ,  B01J23/887 ,  B01J27/199 ,  C01G39/00 ,  C07C51/25 ,  C07C57/05 ,  C07C57/055 ,  C01G1/02

    Abstract: Multimetal oxide composition (I) comprises: (i) a multimetal oxide (II) of molybdenum with vanadium, niobium, tantalum, tungsten and/or rhenium and boron, silicon, phosphorus, germanium, arsenic and/or antimony and optionally other metal(s) or (ii) a mixture of (II) and another multimetal oxide (III), in which (I) consists of crystallites of constant composition. Multimetal oxide composition is of formula (I); (A)p(B)q (I) Mo12X aX bX cX dX eOx (II) MofX gX hOy (III) A = a multimetal oxide of formula (II); B = a multimetal oxide of formula (III); X = hydrogen, up to 97 mole-% of which may be replaced by ammonium, potassium, rubidium and/or cesium; X = vanadium, niobium (Nb), tantalum (Ta), tungsten and/or rhenium; X = boron, silicon, phosphorus, germanium, arsenic and/or antimony (Sb); X = chromium, manganese, iron (Fe), cobalt (Co), nickel (Ni), copper (Cu), zinc (Zn), magnesium (Mg), calcium (Ca), strontium (Sr) and/or barium (Ba); X = sulfur; X = Cu, Fe, Co, Ni, Zn, cadmium, Mn, Mg, Ca, Sr and/or Ba; X = Nb, Ta and/or Sb; a = 1-3; b = 0.1-2; c = 0-5; d, e = 0-1; f = 0-2; g = 0.5-1.5; h = 2-4; x, y = values depending on the valency and frequency ox elements other than oxygen; p = 1; and q = 0; or p, q not = 0 and p/q = (160-1):1. The standard deviation of the stoichiometric coefficient a of the variable X of individual crystallites of component A is less than 0.15, especially less than 0.10. Independent claims are also included for: (a) methods of preparing the multimetal oxide (I); (b) the apparatus used in preparation.

    Mixing a liquid or suspension beneath a gas space in a closed container comprises supplying a stream of the liquid or suspension as a drive jet for a submerged ejector which aspirates gas from the gas space
    14.
    发明专利
    Mixing a liquid or suspension beneath a gas space in a closed container comprises supplying a stream of the liquid or suspension as a drive jet for a submerged ejector which aspirates gas from the gas space 未知

    公开(公告)号：DE102006045088A1

    公开(公告)日：2008-03-27

    申请号：DE102006045088

    申请日：2006-09-21

    Applicant: BASF AG

    Inventor： BLECHSCHMITT MICHAEL ,  HAMMON ULRICH ,  MARTIN FRIEDRICH-GEORG ,  MUELLER-ENGEL KLAUS JOACHIM ,  ZEHNER PETER

    IPC: B01F33/40 ,  C07B63/04 ,  C07C57/07 ,  C07C67/62

    Abstract: Mixing a liquid or suspension beneath a gas space in a closed container comprises supplying a stream of the liquid or suspension as a drive jet for a submerged ejector which aspirates gas from the gas space and discharges the gas together with the drive jet into the liquid or suspension in the container. Independent claims are also included for: (1) container comprising a liquid or suspension beneath a gas space and an ejector with a drive nozzle and a suction chamber in communication with the gas space; (2) container comprising a liquid or suspension beneath a gas space and an ejector jet nozzle having a drive nozzle surrounded by a suction chamber discharging into a mixing nozzle and an impulse exchange chamber into which the outlet of the mixing nozzle is directed, and a connection between the suction chamber and the gas space; (3) ejector jet nozzle having a drive nozzle surrounded by a suction chamber discharging into a mixing nozzle and an impulse exchange chamber into which the outlet of the mixing nozzle is directed, where the transition between the mixing nozzle and the impulse exchange chamber is provided with a jacket fitted with a dip pipe or a connector for a dip pipe; (4) mixing a liquid or suspension beneath a gas space in a closed container by supplying a stream of another liquid or suspension as a drive jet for a submerged ejector which aspirates gas from the gas space and discharges the gas together with the drive jet into the liquid or suspension in the container.

    17.
    发明专利
    未知

    公开(公告)号：DE10063175A1

    公开(公告)日：2002-06-20

    申请号：DE10063175

    申请日：2000-12-18

    Applicant: BASF AG

    Inventor： MARTIN FRIEDRICH-GEORG ,  NESTLER GERHARD ,  SCHROEDER JUERGEN

    IPC: C07C67/08 ,  C07C69/54 ,  C08F120/10

    Abstract: The invention relates to a method for producing (meth)acrylic acid esters by transesterification of the (meth)acrylic acid with a higher alkanol in the presence of an acid catalyst, at least one polymerization inhibitor and one organic solvent that forms an azeotropic mixture with water. The reaction mixture is heated to the boiling point of the mixture in a reactor that comprises a distillation unit with a column and a condenser. The content of the reactor is recirculated via an external evaporator and heated to the boiling point, and the azeotropic mixture is distilled off. The organic solvent forms a reflux and at least a part of the solvent reflux is recirculated between the reactor and the evaporator. The inventive method allows for the production of higher (meth)acrylic acid esters in a reactor with a circulation evaporator without using copper salts as the polymerization inhibitors.

    18.
    发明专利
    未知

    公开(公告)号：DE59802649D1

    公开(公告)日：2002-02-21

    申请号：DE59802649

    申请日：1998-06-26

    Applicant: BASF AG

    Inventor： HENNIG GUNNAR ,  SCHRAUT ARMIN ,  MARTIN FRIEDRICH-GEORG ,  ULBRICH MICHAEL-DIETER ,  BAUR GERHARD ,  THIESSEN FRITZ

    IPC: C07C67/08 ,  C07C67/54 ,  C07C69/54

    Abstract: The invention relates to a method for producing alkyl(meth)acrylate by continuous reaction of an aqueous solution containing (meth)acrylic acid obtained directly from gas-phase oxidation by reacting with a straight-chain or branched alkanol with 1 to 6 C atoms or a mixture of two or more thereof in the presence of an esterification catalyst. The inventive method is characterized in that alkanol is introduced into aqueous solution containing (meth)acrylic acid in the form of a gas.

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