中科微点-全球专利检索

  1. Login
  2. Sign Up

Search Results

63 records (took 0.023 seconds)

    9.
    发明专利
    未知

    公开(公告)号：NL146483B

    公开(公告)日：1975-07-15

    申请号：NL7004122

    申请日：1970-03-23

    Applicant: HOECHST AG

    Inventor： SENNEWALD K ,  OHORODNIK A ,  MITTLER W ,  HUNDECK J ,  HARDEL H-J

    IPC: B01J27/00 ,  B01J31/00 ,  C07B61/00 ,  C07C53/16 ,  C07C51/00 ,  C07C51/377 ,  C07C67/00 ,  C07C51/42 ,  B01J23/54

    Abstract: 1282682 Dehalogenation of haloacids KNAPSACK AG 16 March 1970 [25 March 1969] 12540/70 Heading C2C Monohalocarboxylic acids are prepared from dihalocarboxylic acids, optionally in admixture with trihalocarboxylic acids, by hydrogenation at 60‹ to 170‹ C. using a stationary or suspended catalyst comprising a Group VIII metal with an inert carrier, the catalyst being activated by one or more of (a) a non-poisonous metal salt, oxide or hydroxide, and/or (b) an inorganic or organic proton donor. Examples relate to the purification of crude monochloroacetic acid obtained by the chlorination of glacial acetic acid in the presence of acetic anhydride and acetyl chloride, the product containing dichloroacetic acid, trichloroacetic acid and acetic acid. Metal and ammonium activators specified are metals, alkaline earth metals, rare earth metals or metals of Groups 4 or 5, e.g. lithium chloride, sodium acetate, sodium chloride, sodium chloroacetate, sodium carbonate, potassium acetate, potassium chloride, ammonium acetate, ammonium chloride, calcium chloride, aluminium chloride, cerium dioxide, titanium dioxide and vanadium pentoxide. Organic proton-donor activators specified are triethylamine, pyridine, 4-amino-pyridine, piperidine, glycine, urea or triphenyl-phosphine, salts thereof, trichlorosilane, glycocoll, butyraldehyde, di-isobutyl ketone, butyl acetate and cyanoacetic acid. Granular inert carriers of small grain size are advantageous. Specified catalyst-carrier systems are palladium-silica or silicic acid. The process is preferably operated continuously, with recycling of the hydrogenated products and separation of the catalyst therefrom.

    Selective catalytic dehalogenation of halo - gelated carboxylic acids
    10.
    发明专利
    Selective catalytic dehalogenation of halo - gelated carboxylic acids 未知

    公开(公告)号：NL7500479A

    公开(公告)日：1975-04-29

    申请号：NL7500479

    申请日：1975-01-15

    Applicant: HOECHST AG

    Inventor： SENNEWALD K ,  OHORODNIK A ,  MITTLER W ,  HUNDECK J ,  HARDEL H-J

    IPC: C07C51/377 ,  C07C53/16

    Abstract: To increase the yield and lifetime of noble-metal (Group VIII) catalysts used for hydrogenating dehalogenation of halogenated carboxylic acids; especially for purification of technical-grade CH2ClCOOH, small quantities (0.001% wt. minimum; maximum depends on solubility or miscibility) of activator (i.e. at least one metal salt or oxide which does not poison the catalyst and is at least partially soluble) and/or organic proton-acceptor (at least partially soluble) and/or organic proton-acceptor (at least partially soluble) are added to the initial mixture. The activator is pref. derived from alkali, alkaline-earth, earth, rare-earth or Sub-Grp. IV or V metals, with CH3COO-, CO32-, Cl-, or OH- anions. Preferred proton acceptors are N-contg. organic bases and salts, P-III cpds., ammoniacal cpds. or cpds. with multiple polar linkages. The activation additives are opt. distilled off and recycled.

Patent Agency Ranking