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    3.
    发明专利
    未知

    公开(公告)号：DE59308994D1

    公开(公告)日：1998-10-22

    申请号：DE59308994

    申请日：1993-03-16

    Applicant: HOECHST AG

    Inventor： ROSCHER GUENTER ,  LITTERER HEINZ ,  ENGELMANN AXEL ,  KAUFMANN WOLF-DIETMAR ,  LAUGWITZ BERND ,  SCHNABEL HANS-DIETMAR

    IPC: C07D291/06

    Abstract: PCT No. PCT/EP93/00606 Sec. 371 Date Jun. 19, 1995 Sec. 102(e) Date Jun. 19, 1995 PCT Filed Mar. 16, 1993 PCT Pub. No. WO93/19055 PCT Pub. Date Sep. 30, 1993The invention relates to a process for the preparation of acesulfam salts by reaction of salts of amidosulfonic acid with diketene to give a salt of acetoacetamidosulfonic acid (I), ring closure by the action of at least about an equivalent amount of SO3, at least this ring closure reaction being carried out in the presence of a halogenated, aliphatic hydrocarbon as an inert solvent, treatment of the cyclization product with water and conversion of the resulting acesulfam-H (II) into the form of a non-toxic salt, which comprises, in the work-up by distillation of the resulting crude solvent, after removal of water and low-boilers and recovery of solvent sufficiently pure for reuse in the preparation of compounds (I) and/or (II), directly returning :he remaining, solvent-containing distillation residue, without further purification, into the system downstream of the reaction vessel for carrying out the ring closure reaction.

    PROCESS FOR THE PREPARATION OF DIALKYL VINYLPHOSPHONATES
    6.
    发明专利
    PROCESS FOR THE PREPARATION OF DIALKYL VINYLPHOSPHONATES 未知

    公开(公告)号：CA1297494C

    公开(公告)日：1992-03-17

    申请号：CA560543

    申请日：1988-03-04

    Applicant: HOECHST AG

    Inventor： ROSCHER GUENTER ,  KLEINER HANS-JERG ,  IHL GABRIELE ,  LEIPE HERMANN

    IPC: C07B61/00 ,  C07F9/40

    Abstract: HOE 87/F 065 : A process for the production of dialkyl esterr of vinyl phosphonic acid which comprises subjecting dialkyl esters of 2-acetoxyethane phosphonic acid to cleavage by contacting with a liquid catalytically acting medium at a temperature in the range from 150 to 270.degree.C and under a pressure such that the partial pressures of the total of the components of the reaction system is in the range from 1 to 500 mbar, and drawing off the resultlng dialkyl esters of vinyl phosphonic acid and other volatile reaction products.

    PROCESS FOR THE PREPARATION OF VINYL ACETATE
    7.
    发明专利
    PROCESS FOR THE PREPARATION OF VINYL ACETATE 未知

    公开(公告)号：CA2031429A1

    公开(公告)日：1991-06-06

    申请号：CA2031429

    申请日：1990-12-04

    Applicant: HOECHST AG

    Inventor： WUNDER FRIEDRICH ,  WIRTZ PETER ,  ROSCHER GUENTER ,  EICHLER KLAUS

    IPC: B01J23/52 ,  B01J23/58 ,  B01J23/60 ,  B01J23/66 ,  B01J35/10 ,  B01J37/00 ,  C07B61/00 ,  C07C67/05 ,  C07C67/055 ,  C07C69/15

    Abstract: - - HOE 89/F 384 of the disclosure Process for the preparation of vinyl acetate The invention relates to a process for the preparation of vinyl acetate in the gas phase from ethylene, acetic acid and oxygen or oxygen-containing gases on a catalyst which contains palladium and/or its compounds and, if desired, additionally gold and/or gold compounds and which contains as activators alkali metal compounds and,if desired,additionally cadmium compounds on a support which is composed of SiO2 or an SiO2 Al2O3 mixture having a surface area of 50 - 250 m2/g and a pore volume of 0.4 - 1.2 ml/g and whose particles have a particle size of 4 to 9 mm, 5 to 20% of the pore volume of the support being formed of pores having radii of 200 to 3000 .ANG. and 50 to 90% of the pore volume being formed of pores having radii of 70 to 100 .ANG.. The support particles are compressed with the aid of an Li, Mg, Al, Zn or Mn salt of a C2-C20 carboxylic acid or a mixture of such salts as binder.

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