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    METHOD OF SEPARATING VINYLPHOSPHONIC ACID FROM CRUDE MIXTURES
    51.
    发明专利
    METHOD OF SEPARATING VINYLPHOSPHONIC ACID FROM CRUDE MIXTURES 未知

    公开(公告)号：CA2088772C

    公开(公告)日：1995-12-12

    申请号：CA2088772

    申请日：1991-07-27

    Applicant: HOECHST AG

    Inventor： ROSCHER GUENTER

    IPC: C07F9/02 ,  C07F9/38

    Abstract: The invention relates to a method for separating vinylphosphonic acid from crude mixtures, the separation being carried out by extraction with alcohols and/or ketones, which in each case comprise at least 5 carbon atoms. According to the invention, vinylphosphonic acid can be obtained in high purity and good yield from highly contaminated crude mixtures.

    53.
    发明专利
    未知

    公开(公告)号：DE59103998D1

    公开(公告)日：1995-02-02

    申请号：DE59103998

    申请日：1991-07-27

    Applicant: HOECHST AG

    Inventor： ROSCHER GUENTER

    IPC: C07F9/02 ,  C07F9/38

    Abstract: PCT No. PCT/EP91/01412 Sec. 371 Date Feb. 3, 1993 Sec. 102(e) Date Feb. 3, 1993 PCT Filed Jul. 27, 1991 PCT Pub. No. WO92/02524 PCT Pub. Date Feb. 20, 1992.Method of separating vinylphosphonic acid from crude mixtures. The invention relates to a method for separating vinylphosphonic acid from crude mixtures, the separation being carried out by extraction with alcohols and/or ketones, which in each case comprise at least 5 carbon atoms. According to the invention, vinylphosphonic acid can be obtained in high purity and good yield from highly contaminated crude mixtures.

    PROCESS AND DEVICE FOR PREPARING THE NON-TOXIC SALTS OF 6-METHYL-3,4-DIHYDRO-1,2,3-OXATHIAZIN-4íON-2,2-DIOXIDE
    54.
    发明专利
    PROCESS AND DEVICE FOR PREPARING THE NON-TOXIC SALTS OF 6-METHYL-3,4-DIHYDRO-1,2,3-OXATHIAZIN-4íON-2,2-DIOXIDE 未知

    公开(公告)号：HU9402643D0

    公开(公告)日：1994-12-28

    申请号：HU9402643

    申请日：1993-03-16

    Applicant: HOECHST AG

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

    57.
    发明专利
    未知

    公开(公告)号：MX9203016A

    公开(公告)日：1992-12-01

    申请号：MX9203016

    申请日：1992-06-18

    Applicant: HOECHST AG

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

    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.

    PROCESS FOR SEPARATING WATER FROM MIXTURES THEREOF WITH VINYL ACETATE AND ACETIC ACID
    60.
    发明专利
    PROCESS FOR SEPARATING WATER FROM MIXTURES THEREOF WITH VINYL ACETATE AND ACETIC ACID 未知

    公开(公告)号：CA1172597A

    公开(公告)日：1984-08-14

    申请号：CA363606

    申请日：1980-10-30

    Applicant: HOECHST AG ,  WACKER CHEMIE GMBH

    Inventor： ROSCHER GUENTER ,  SCHMIDT KARL-HEINZ ,  LANGNER HORST ,  NEU HERMANN ,  LIENERTH ALADAR ,  DEMPF DOMINIK ,  KAISER KLAUS

    IPC: C07C67/055 ,  C07C67/54 ,  C07C69/15 ,  B01D3/36

    Abstract: HOE 79/F 289 PROCESS FOR SEPARATING WATER FROM MIXTURES THEREOF WITH VINYL ACETATE AND ACETIC ACID of the disclosure: Process for separating water from a gas mixture, obtained in the manufacture of vinyl acetate by reacting ethylene with acetic acid and oxygen in contact with catalysts containing palladium or palladium compounds in the gaseous phase and consisting essentially of acetic acid, vinyl acetate, water, carbon dioxide and ethylene, wherein a) the gas mixture leaving the reaction zone is condensed to give a condensate containing the main amount of acetic acid, of vinyl acetate and of water and b) an acetic acid solution containing the residual amount of vinyl acetate and water is prepared by absorption of the non condensed gas in acetic acid, is characterized in that c) the condensate obtained in step a) and the solution obtained in step b) are introduced separately from each other into the same distillation column, the feeding point of the condensate being above the feeding point of the solution, the water is distilled off at the head of said column as azeotrope together with the vinyl acetate and d) the water phase is removed from the distillate separating into a water phase and a vinyl acetate phase.

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