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    CONTINUOUS DISTILLATION OF THERMOLABILE MONOMER
    1.
    发明专利
    CONTINUOUS DISTILLATION OF THERMOLABILE MONOMER 失效

    公开(公告)号：JP2000309568A

    公开(公告)日：2000-11-07

    申请号：JP12276799

    申请日：1999-04-28

    Applicant: BASF AG

    Inventor： DUPUIS JACQUES ,  WINTER MANFRED ,  KROENER MICHAEL

    IPC: B01D3/10 ,  B01D3/34 ,  C07C231/24 ,  C07C233/03 ,  C07D207/26 ,  C07D207/267

    Abstract: PROBLEM TO BE SOLVED: To provide an improved method for distilling a thermolabile monomer. SOLUTION: A thermolabile monomer and formaldehyde are continuously and individually fed into a lower part of a distillation tower up to its middle part in a liquid state; the formaldehyde is vaporized by means of an evaporator in the bottom of the tower; the formaldehyde is discharged from the bottom of the tower together with components having higher boiling point than the thermolabile monomer; the formaldehyde is refilled by adding fresh formaldehyde; the thermolabile monomer is removed from a side discharging port formed at the upper third of the distillation tower; the distillation is controlled so that the monomer contains formaldehyde in an amount of less than 5 wt.%; and a product flow containing components having lower boiling points than the thermolabile monomer is removed from the top of the distillation tower.

    CONTINUOUS DISTILLATION OF THERMOLABILE MONOMER UNDER REDUCED PRESSURE IN COLUMN
    2.
    发明专利
    CONTINUOUS DISTILLATION OF THERMOLABILE MONOMER UNDER REDUCED PRESSURE IN COLUMN 失效

    公开(公告)号：JP2000159695A

    公开(公告)日：2000-06-13

    申请号：JP34004298

    申请日：1998-11-30

    Applicant: BASF AG

    Inventor： JACQUES DUPUY ,  WINTER MANFRED

    IPC: C07D207/267 ,  C07B63/00 ,  C07C231/24 ,  C07C233/03

    Abstract: PROBLEM TO BE SOLVED: To prevent impurities interfering the polymerization of distilled monomers or low-boiling dissociation products contaminating distillates by continuously distilling a thermolabile monomer under a reduced pressure in a column according to a specific method. SOLUTION: When (A) a thermolabile monomer is continuously distilled under a reduced pressure in a column, the component A in the form of a vapor or a liquid is initially fed to the column and (B) an inert distillation aid forming a heteroazeotrope with the component A is introduced into an evaporator at the bottom but separately from the monomer feed and evaporated in the evaporator. Otherwise, an emulsion comprising the components A and B is fed into the evaporator or the column. The azeotrope is then condensed at the top of the column and the resultant mixture is separated in a phase separator to remove the component A. The component B is returned to the column or, as desired, worked up thereafter. The component having a higher boiling point than that of the component A is removed from the bottom of the column.

    MOLDING MEMBER
    3.
    发明专利
    MOLDING MEMBER 失效

    公开(公告)号：JP2000157873A

    公开(公告)日：2000-06-13

    申请号：JP33835699

    申请日：1999-10-22

    Applicant: BASF AG

    Inventor： WINTER MANFRED

    IPC: B01D53/18 ,  B01J19/30 ,  B01J19/32 ,  B01J27/232 ,  B01J35/02 ,  C07B61/00 ,  C07C231/12 ,  C07C231/14 ,  C07C233/03 ,  C07C233/05

    Abstract: PROBLEM TO BE SOLVED: To uniformly heat by forming a molding member used as a filling element in a chemical device from at least two closing frames and crosspieces for bonding the frames and disposing the frames within a plurality of planes parallel to an axial line passing through the central point of the frames at a distance from each other. SOLUTION: A molding member 1 is provided with four rings 2 disposed within an upper plane and four eccentric rings 3 having elliptical transverse sections and disposed within a lower plane. Also four crosspieces 4 for bonding all rings (frames) 2 and 3 respectively within two planes and totally four crosspieces 5 for bonding three outer rings 2 and 3 respectively within two planes are provided. In the case that the molding member thus formed is used as a filling element in a chemical device (reactor), the temperature difference between a central section of the reactor and the vicinity of adjoining reactor walls in the exothermic reaction and the endothermic reaction can be eliminated to effectively carry out the reaction.

    7.
    发明专利
    未知

    公开(公告)号：DE10158661A1

    公开(公告)日：2003-06-12

    申请号：DE10158661

    申请日：2001-11-30

    Applicant: BASF AG

    Inventor： ETTL ROLAND ,  WINTER MANFRED ,  FREUND TORSTEN ,  KESSLER THOMAS ,  GRIMM GUENTHER

    IPC: C07D315/00 ,  C07C45/89

    Abstract: The invention relates to a method for producing alkyl ketene dimers by reacting carboxylic acid chlorides with tertiary amines in a molar ratio of between 1: 1 and 1: 1.6 at temperatures of between 65 and 150 DEG C and with a residence time of between 1 and 30 mins in the absence of solvents. Said reaction partners are intensively mixed and the alkyl ketene dimers are separated from the reaction mixture.

    10.
    发明专利
    未知

    公开(公告)号：DE59501380D1

    公开(公告)日：1998-03-05

    申请号：DE59501380

    申请日：1995-03-20

    Applicant: BASF AG

    Inventor： NILZ CLAUDIA ,  WINTER MANFRED ,  KROENER MICHAEL ,  STANGE ANDREAS ,  SCHUHMACHER RUDOLF

    IPC: C08F8/12 ,  D21H17/34 ,  D21H21/18 ,  D21H21/20

    Abstract: PCT No. PCT/EP95/01030 Sec. 371 Date Sep. 30, 1996 Sec. 102(e) Date Sep. 30, 1996 PCT Filed Mar. 20, 1995 PCT Pub. No. WO95/26989 PCT Pub. Date Oct. 12, 1995Solutions of polymers containing vinylamine units, which solutions have a long shelf life, are prepared by hydrolyzing polymers containing N-vinylcarboxamide units with acids in an aqueous medium and removing the carboxylic acids eliminated from the polymers as esters from the aqueous polymer solution after the hydrolysis by adding at least stoichiometric amounts of at least one C1-C6-alcohol and distilling off the esters from the reaction mixture, and said aqueous solutions are used as dry and wet strength agents in papermaking.

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