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    METHOD FOR PURIFYING PHTHALIDES
    41.
    发明专利
    METHOD FOR PURIFYING PHTHALIDES 未知

    公开(公告)号：CA2303876A1

    公开(公告)日：1999-04-01

    申请号：CA2303876

    申请日：1998-09-18

    Applicant: BASF AG

    Inventor： PUTTER HERMANN ,  BAUMANN DIETER ,  HANNEBAUM HEINZ

    IPC: C07D307/88 ,  C25B3/25

    Abstract: Pure phthalides are produced from the reaction mixtures obtained in the phthalide production process by a) distilling off compounds with a boiling point below the boiling point of the phthalide from the reaction mixture, if such compounds are present, to obtain a residue of crude phthalide, and b) crystallising phthalide from a melt of the crude phthalide.

    METHOD FOR PRODUCING PHTHALIDES
    46.
    发明专利
    METHOD FOR PRODUCING PHTHALIDES 未知

    公开(公告)号：CA2303985C

    公开(公告)日：2008-05-27

    申请号：CA2303985

    申请日：1998-09-05

    Applicant: BASF AG

    Inventor： HANNEBAUM HEINZ ,  BAUMANN DIETER ,  PUTTER HERMANN

    IPC: C25B3/25 ,  C07D307/88 ,  C07D307/89

    Abstract: The invention relates to a method for producing phthalides in which I) phthalate acid or phthalate acid derivatives which are dissolved in an electrolyte are reduced on a cathode in a non-divided electrolysis cell in which the carboxy groups can be replaced by units and can be derived from the carboxy groups in a condensation reaction. One or more hydrogen atoms of the o-phenylene unit can be substituted by inert residues. II) Once the reaction has reached a given stage at which the molar ratio relationship (M) which is formed from the portion of phthalide and the sum of the portion of phthalide, phthalate acid or the phthalate acid derivatives in the electrolyte amounts to 0.8:1 to 0.995:1, the electrolyte from the electrolysis cell is removed and III) the phthalide is crystallized out of the electrolyte and separated from the original solution optionally after distillation reprocessing of said electrolyte.

    49.
    发明专利
    未知

    公开(公告)号：BR0314992A

    公开(公告)日：2005-08-09

    申请号：BR0314992

    申请日：2003-10-06

    Applicant: BASF AG

    Inventor： THIEL JOACHIM ,  HAMMON ULRICH ,  BAUMANN DIETER ,  HEILEK JOERG ,  SCHROEDER JUERGEN ,  MUELLER-ENGEL KLAUS JOACHIM

    IPC: C07C51/44 ,  C07C57/04

    Abstract: In a process for preparing acrylic acid, an acrylic acid-containing product gas mixture obtained by catalytic gas phase partial oxidation of a C 3 precursor of acrylic acid, after direct cooling with a quench liquid, is fractionally condensed in a separating column provided with internals, rising into itself with sidestream takeoff of crude acrylic acid, and the acrylic acid oligomers which form are dissociated and the resulting dissociation gas is subjected to a countercurrent rectification before it is recycled.

    50.
    发明专利
    未知

    公开(公告)号：BR0110483A

    公开(公告)日：2003-04-08

    申请号：BR0110483

    申请日：2001-04-30

    Applicant: BASF AG

    Inventor： BASSLER PETER ,  BAUMANN DIETER ,  FISCHER ROLF-HARTMUTH ,  FUCHS EBERHARD ,  MELDER JOHANN-PETER ,  OHLBACH FRANK

    IPC: C07D223/12 ,  C07D201/08

    Abstract: A process for the preparation of caprolactam is provided, whereina) a mixture (I) containing 6-aminocapronitrile and water is reacted in the gas phase, in the presence of a catalyst, to give a mixture (II) containing caprolactam, ammonia, water, high-boiling components and low-boiling components,b) ammonia is then removed from the mixture (II) to give a mixture (III) containing caprolactam, water, high-boiling components and low-boiling components,c) water is then removed from the mixture (III) to give a mixture (IV) containing caprolactam, high-boiling components and low-boiling components, andd) a solid (V) containing caprolactam is then obtained from the mixture (IV) by crystallization, the proportion by weight of caprolactam in the solid (V) being greater than in the mixture (IV).

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