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    52.
    发明专利
    未知

    公开(公告)号：DE10036880A1

    公开(公告)日：2002-02-07

    申请号：DE10036880

    申请日：2000-07-28

    Applicant: BASF AG

    Inventor： HEILEK JOERG ,  ECK BERND ,  BAUMANN DIETER

    IPC: B01D9/00 ,  C07C51/43 ,  C07C51/47 ,  G01N21/51

    Abstract: The invention relates to the use of an optical line detector for regulating the position of the wash front and/or the structural front pertaining to the crystal bed of a wash column during a melt cristallisation process, as well as a corresponding method for regulation. The line detector, for example a CCD camera or a linear array of luminance probes, is arranged in such a way that optical properties of the crystal bed can be continuously detected in a region running parallel to the longitudinal axis of the wash column. Said region covers the desired nominal position of the wash front or the structural front.

    53.
    发明专利
    未知

    公开(公告)号：DE10026407A1

    公开(公告)日：2001-12-06

    申请号：DE10026407

    申请日：2000-05-29

    Applicant: BASF AG

    Inventor： ECK BERND ,  BAUMANN DIETER ,  HEILEK JOERG ,  MUELLER-ENGEL KLAUS JOACHIM

    IPC: C07C51/43 ,  C07C57/07

    Abstract: The invention relates to a method for discontinuous purification of crude acrylic acid by means of crystallization, comprising at least one purification step and at least one stripping step. The first stripping step is carried out in a different crystallizer from the first purification step.

    56.
    发明专利
    未知

    公开(公告)号：BRPI0611654A2

    公开(公告)日：2011-05-31

    申请号：BRPI0611654

    申请日：2006-05-02

    Applicant: BASF AG

    Inventor： HAUK ALEXANDER ,  GROPP STEFAN ,  RIECK DANIELA ,  HEILEK JOERG ,  LAUX GERHARD ,  LENZ ROBERT

    IPC: C07C51/41 ,  C07C53/02 ,  C07C53/06

    Abstract: The calculation of the above balance shows that the division of stream (5) into the streams (5a) and (5b) used here leads to the fact that in the neutralization stage no excess sodium formate is produced, so that any ejection can be omitted. Furthermore, the water content of the stream (14) comprising sodium formate recirculated to the first crystallization stage in this case can be set to a very low value.

    57.
    发明专利
    未知

    公开(公告)号：BRPI0607493A2

    公开(公告)日：2010-04-06

    申请号：BRPI0607493

    申请日：2006-03-01

    Applicant: BASF AG

    Inventor： HEILEK JOERG ,  MUELLER-ENGEL KLAUS JOACHIM ,  DIETERLE MARTIN ,  ADAMI CHRISTOPH

    IPC: C07C51/43 ,  C07C57/04

    Abstract: Disclosed is a method for eliminating methacrylic acid from a liquid phase (P) containing acrylic acid as a main component and target product and methacrylic acid as a secondary component. According to said method, the methacrylic acid is eliminated using crystallization, the acrylic acid accumulating in the formed crystallized product and the methacrylic acid accumulating in the remaining mother liquor.

    Heterogeneously-catalyzed partial direct oxidation of n-propane to acrylic acid comprises conducting initial reaction gas mixture comprising n-propane and molecular oxygen through a fixed bed catalyst and separating the acrylic acid
    59.
    发明专利
    Heterogeneously-catalyzed partial direct oxidation of n-propane to acrylic acid comprises conducting initial reaction gas mixture comprising n-propane and molecular oxygen through a fixed bed catalyst and separating the acrylic acid 未知

    公开(公告)号：DE102007029053A1

    公开(公告)日：2008-01-03

    申请号：DE102007029053

    申请日：2007-06-21

    Applicant: BASF AG

    Inventor： DIETERLE MARTIN ,  HEILEK JOERG ,  MUELLER-ENGEL KLAUS JOACHIM

    IPC: C07C57/05 ,  C07C57/07

    Abstract: Heterogeneously-catalyzed partial direct oxidation of n-propane to acrylic acid, comprises: conducting an initial mixture of reaction gases, which contain n-propane, molecular oxygen and at least an inert diluent gas, at elevated temperature through a fixed bed catalyst; subsequently transferring the obtained product gas containing acrylic acid into a first separation zone, in which the product gas is transferred into the liquid phase; separating the acrylic acid from the liquid phase in a second separation zone by at least a thermal separation procedure. Heterogeneously-catalyzed partial direct oxidation of n-propane to acrylic acid, comprises: conducting an initial mixture of reaction gases, which contain n-propane, molecular oxygen and at least an inert diluent gas, at elevated temperature through a fixed bed catalyst having a catalyst in a solid physical state, where the conversion of n-propane in the case of a single passage of the reaction gases through the catalyst bed amounts to >=10 mol.% and the selectivity of the acrylic acid formation, relative to the converted n-propane, amounts to >=40 mol.%; subsequently transferring the obtained product gas containing acrylic acid into a first separation zone, in which the product gas is transferred into the liquid phase; separating the remaining gases that contain n-propane and is depleted of acrylic acid, from the first separation zone; refluxing at least a partial quantity of the n-propane contained in the remaining product in the form of a gas to the reaction step; separating the acrylic acid from the liquid phase in a second separation zone by at least a thermal separation procedure. The initial mixture of reaction gases contains 2-50 vol.% of n-propane, 0.1-60 vol.% of carbon dioxide, 1-50 vol.% oxygen and 1-50 vol.% of water, related to its total volume, and up to 1 mol.% of cyclo-propane, related to the molar volume of n-propane contained in the initial mixture of reaction gases, The thermal separation process in the second separation zone comprises the separation of the acrylic acid by means of at least a crystallization step.

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