中科微点-全球专利检索

  1. Login
  2. Sign Up

Search Results

47 records (took 0.023 seconds)

    Process for the preparation of the non-toxic salts of 6-methyl-3, 4-dihydro-1,2,3-oxathiazin-4-one 2, 2-dioxide and arrangement for carrying out this process
    4.
    发明专利
    Process for the preparation of the non-toxic salts of 6-methyl-3, 4-dihydro-1,2,3-oxathiazin-4-one 2, 2-dioxide and arrangement for carrying out this process 未知

    公开(公告)号：SG52713A1

    公开(公告)日：1998-09-28

    申请号：SG1996008156

    申请日：1993-03-16

    Applicant: HOECHST AG

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

    IPC: C07D291/06 ,  C07B37/10

    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.

    Verfahren zur herstellung vinylacetat
    5.
    发明专利
    Verfahren zur herstellung vinylacetat 未知

    公开(公告)号：SG44750A1

    公开(公告)日：1997-12-19

    申请号：SG1996006902

    申请日：1992-06-17

    Applicant: HOECHST AG

    Inventor： WIRTZ PETER ,  WORNER KARL-FRED ,  WUNDER FRIEDRICH ,  EICHLER KLAUS ,  ROSCHER GUNTER ,  NICHOLAU LOAN

    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 ,  C07C

    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 PREPARING ALKANEPHOSPHONIC ANHYDRIDES
    10.
    发明专利
    PROCESS FOR PREPARING ALKANEPHOSPHONIC ANHYDRIDES 未知

    公开(公告)号：CA2162082C

    公开(公告)日：2006-08-08

    申请号：CA2162082

    申请日：1995-11-03

    Applicant: HOECHST AG

    Inventor： MOLLENKOPF CARL CHRISTOPH ,  LEUPOLD ERNST INGO ,  ROSCHER GUNTER

    IPC: C07F9/38

    Abstract: Process for preparing alkanephosphonic anhydrides of the formula (I) (see formula I) where R is straight-chain or branched unsubstituted C1-C6-alkyl and n .gtoreq. 3, which comprises pyrolytically eliminating water from an alkanephosphonic acid of the formula (II) or a pyroalkanephosphonic acid of the formula (III) (see formula II,III) where R is straight-chain or branched Cl-C6-alkyl, without addition of solvent and removing the water from the reaction mixture by means of an inert gas stream.

Patent Agency Ranking