公开(公告)号：ZA7604225B

公开(公告)日：1977-07-27

申请号：ZA7604225

申请日：1976-07-16

Applicant: HOECHST AG

Inventor： GEHRMANN K ,  OHORODNIK A ,  LOHMAR E ,  RIECHMANN W

IPC: C07F9/32 ,  C07F9/34 ,  C07F9/6571 ,  C07F9/6574 ,  C07F

CPC classification number: C07F9/657172 ,  Y10S203/11

公开(公告)号：SE392045B

公开(公告)日：1977-03-14

申请号：SE7310110

申请日：1973-07-19

Applicant: HOECHST AG

Inventor： OHORODNIK A ,  GEHRMANN K ,  HUNDECK J ,  VIERLING H

IPC: B01J23/44 ,  B01J35/10 ,  C07C53/16 ,  B01J37/02 ,  C07C51/00 ,  C07C51/377 ,  C07C67/00

Abstract: Production of a catalyst comprised of a fine-particulate carrier and palladium metal for the partial dehalogenation of di- and/or trichloracetic acids in the presence of hydrogen to produce monochloracetic acid, wherein the dry porous carrier is impregnated with a palladium salt solution and the palladium absorbed by the carrier is reduced to palladium metal with the use of a suitable reducing agent. More particularly the palladium metal is concentrated exclusively on the surface of the carrier by impregnating and partially saturating the dry, fine-particulate carrier with the pure palladium salt solvent; by continuing impregnation until complete saturation of the carrier so pretreated with the necessary quantity of palladium salt solution; and by reducing the palladium salt applied to the carrier to palladium in known manner.

公开(公告)号：SE374103B

公开(公告)日：1975-02-24

申请号：SE523270

申请日：1970-04-16

Applicant: HOECHST AG

Inventor： SENNEWALD K ,  OHORODNIK A ,  HUNDECK J ,  MITTLER W ,  VIERLING H ,  OPITZ W

IPC: C07C53/16 ,  B01J23/96 ,  B01J38/42 ,  C07B61/00 ,  C07C51/00 ,  C07C67/00

Abstract: 1289221 Regenerating dechlorination catalysts KNAPSACK AG 22 April 1970 [24 April 1969] 19327/70 Heading B1E Catalysts containing metallic palladium on an acid-resistant carrier which have been used in the hydrogenative dechlorination of di- and/or tri-chloroacetic acid to give (chloro) acetic acid and which contain moisture in the form of water and/or acetic acid and/or chloroacetic acid are regenerated by treatment with Cl 2 gas in an acid medium at 20-200‹C; expelling residual Cl 2 with an inert gas; and reducing the PdCl 2 to metallic Pd. Prior to oxidation with Cl 2 the catalyst may be washed with water and/or acetic acid and/or chloroacetic acid and partially dried. The acid medium may be a volatile acid such as hydrohalic acetic or chloroacetic acid and the reducing agent may be H 2 , N 2 H 4 , alkali metal formate/formic acid, NaBH 4 or hydroquinone. The acid resistant carrier may be silicic acid.