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    1.
    发明专利
    未知

    公开(公告)号：DK0565952T3

    公开(公告)日：1997-02-24

    申请号：DK93105335

    申请日：1993-03-31

    Applicant: HOECHST AG

    Inventor： WIRTZ PETER DR ,  WUNDER FRIEDRICH DR ,  WOERNER KARL-FRED DR

    IPC: B01J23/58 ,  B01J23/60 ,  B01J23/66 ,  B01J37/02 ,  B01J37/34 ,  C07B61/00 ,  C07C67/055 ,  C07C69/15

    Abstract: The invention relates to improved Pd/K/Au, Pd/K/Ba and Pd/K/Cd supported catalysts, the preparation thereof, and the use thereof for preparing vinyl acetate from ethylene, acetic acid and oxygen in the gas phase. These catalysts are prepared by atomising a solution of the corresponding metal salts by means of ultrasound and then applying it in such limited amounts and within such a limited time to the support particles and commencing the drying thereof, that the catalytically active metal salts cannot penetrate the support particles as far as their core but only an outer part of greater or lesser size.

    2.
    发明专利
    未知

    公开(公告)号：ES2060905T3

    公开(公告)日：1994-12-01

    申请号：ES90122905

    申请日：1990-11-30

    Applicant: HOECHST AG

    Inventor： WUNDER FRIEDRICH DR ,  WIRTZ PETER DR ,  ROSCHER GUNTER DR ,  EICHLER KLAUS DR

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

    Abstract: 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 containing palladium and/or compounds thereof and, if desired, in addition gold and/or gold compounds and, as activators, alkali metal compounds and, if desired, in addition cadmium compounds on a support comprising SiO2 or an SiO2/Al2O3 mixture having a surface area of 50 - 250 m /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 by pores having radii from 200 to 3000 ANGSTROM and 50 to 90% of the pore volume being formed by pores having radii from 70 to 100 ANGSTROM . The support particles are compacted by means of an Li salt, Mg salt, Al salt, Zn salt or Mn salt of a C2-C20-carboxylic acid or a mixture of such salts as binders.

    3.
    发明专利
    未知

    公开(公告)号：DE59007054D1

    公开(公告)日：1994-10-13

    申请号：DE59007054

    申请日：1990-11-30

    Applicant: HOECHST AG

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

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

    Abstract: 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 containing palladium and/or compounds thereof and, if desired, in addition gold and/or gold compounds and, as activators, alkali metal compounds and, if desired, in addition cadmium compounds on a support comprising SiO2 or an SiO2/Al2O3 mixture having a surface area of 50 - 250 m /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 by pores having radii from 200 to 3000 ANGSTROM and 50 to 90% of the pore volume being formed by pores having radii from 70 to 100 ANGSTROM . The support particles are compacted by means of an Li salt, Mg salt, Al salt, Zn salt or Mn salt of a C2-C20-carboxylic acid or a mixture of such salts as binders.

    10.
    发明专利
    未知

    公开(公告)号：DE59201636D1

    公开(公告)日：1995-04-20

    申请号：DE59201636

    申请日：1992-06-17

    Applicant: HOECHST AG

    Inventor： WIRTZ PETER DR ,  WOERNER KARL-FRED DR ,  WUNDER FRIEDRICH DR ,  EICHLER KLAUS DR ,  ROSCHER GUENTER DR

    IPC: B01J23/44 ,  B01J23/06 ,  B01J23/48 ,  B01J23/52 ,  B01J23/58 ,  B01J23/60 ,  B01J23/66 ,  B01J23/89 ,  B01J35/10 ,  B01J37/00 ,  B01J37/02 ,  C07B61/00 ,  C07C67/05 ,  C07C67/055 ,  C07C69/15

    Abstract: Prodn. of catalysts (I) involves (a) washing the ignited support particles with an acid which does not react with silica or alumina, until no more binder cations are washed out, (b) impregnating with Pd and Au or Cd, (c) contacting with a soln. of a base until there is no further change in the thickness of the noble metal layer produced on the particle surface and (d) impregnating with an alkali cpd. Catalyst contains Pd and/or Pd cpds. and alkali cpds., together with Cd cpds. and/or Au or Au cpds., on particles of a SiO2 or SiO2/Al2O3 substrate which is obtd. by pressing with the binder aid consisting of Li, Mg, Al, Zn, Fe and/or Mn 2-26C carboxylate(s), and igniting for 0.25-5 hrs. at 500-900 deg. C in oxgyen-contg. gas, to give a prod. with surface area 50-250 m2/g, pore vol. 0.4-1.2 ml/g and particle size 1-15mm, in which 5-20 vol. % of the pores have radius = 200-3000 Angstrom and 50-90 vol. % have radius = 70-100 Angstrom. Acid in (a) is pref. HCl, H2SO4, H3PO4 or HNO3, pref. HCl, the base in (c) is an alkali hydroxide, and a potassium cpd. is used in stage (d). Pref. (I) is obtd. by mixing glass microspheres (silica/alumina; at least 95 wt. % silica; obtd. by flame hydrolysis) with 10-20C Mg or Al carboxylate, pressing and igniting as above to give 5-7mm pellets, washing for 10-14 hours, with 10-20% HCl, drying impregnating with a soln. of PdCl2 and AuCl3 or Cd salt (chloride, nitrate etc.), precipitating with NaOH soln., impregnating with KOAc and drying; vinyl acetate prodn. is carried out at 120-200 deg. C and 1-20 bar, using a gas mixt. contg. not above 10 vol. % oxygen.

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