公开(公告)号：US3660306A

公开(公告)日：1972-05-02

申请号：US3660306D

申请日：1970-04-20

Applicant: KNAPSACK AG

Inventor： SENNEWALD KURT ,  OHORODNIK ALEXANDER ,  HUNDECK JOACHIM ,  MITTLER WERNER ,  VIERLING HERMANN ,  OPITZ WOLFGANG

IPC: C07C53/16 ,  B01J23/96 ,  B01J38/42 ,  C07B61/00 ,  C07C51/00 ,  C07C67/00 ,  B01J11/18 ,  B01J11/02

CPC classification number: B01J23/96

Abstract: A CATALYST CONTAINING METALLIC PALLADIUM DEPOSITED ON AN ACIDPROOF CARRIER FOR USE IN THE HYDROGENATION AND DECHLORINATION OF DICHLOROACETIC ACID AND/OR TRICHLOROACETIC ACID TO PRODUCE MONOCHLOROACETIC ACID AND/OR ACETIC IS REGENERATED. TO THIS EFFECT, THE POISONED CATALYST CONTAINING MOISTURE IN FORM OF WATER AND/OR ACETIC ACID AND/OR MONOCHLOROACETIC ACID IS TREATED WITH CHLORINE GAS IN AN ACID MEDIUM, AT TERPERATURES OF BETWEEN 20 AND 200*C., WHEREBY THE METALLIC PALLADIUM IS OXIDIZED TO PALLADIUM CHLORIDE; RESIDUAL CHLORINE IS EXPELLED BY MEANS OF AN ENERT GAS; AND THE OXIDIZED CATALYST IS SUCCESSIVELY TREATED WITH A REDUCING AGENT TO RE-EFFECT REDUCTION OF THE PALLADIUM CHLORIDE TO METALLIC PALLADIUM.

公开(公告)号：US3696015A

公开(公告)日：1972-10-03

申请号：US3696015D

申请日：1970-11-18

Applicant: KNAPSACK AG

Inventor： WIRTZ PETER ,  JACOBOWSKY ARMIN ,  MITTLER WERNER ,  GERHARDT WILFRIED

IPC: C07C17/383 ,  C07C17/00 ,  C07C17/38 ,  C07C17/395 ,  C07C19/045 ,  C07C67/00 ,  B01J1/10

CPC classification number: C07C17/38 ,  C07C17/395 ,  C07C19/045

Abstract: THE CONCENTRATION OF 2-CHLOROBUTADIENE-(1,3) IN 1,2DICHLOROETHANE RECOVERED IN THE INCOMPLETE THERMAL CRACKING OF 1,2-DICHLOROETHANE INTO VINYL CHLORIDE AND BEING CONTAIMINATED WITH LOW BOILERS BOILING AT A TEMPERATURE LOWER THAN 83.7*C. (760 MM. HG) AND HIGH BOILERS BOILING AT A TEMPERATURE HIGHER THAN 83.7*C. (760 MM. HG), IS REDUCED BY TRANSFORMING THE 2-CHLOROBUTADIENE-(1,3) LOW BOILER INTO A HIGH BOILER CONTAMINANT. TO THIS END, THE 1,2-DICHLOROETHANE IS DISTILLATIVELY FREED FROM ITS LOW BOILER CONTAMINANTS IN A LOW BOILER COLUMN; ALL OR A PORTION OF THE LOW BOILER CONTAMINANTS CONCENTRATING NEAR THE HEAD OF THE LOW BOILER COLUMN IS CONTINUOUSLY WITHDRAWN THEREFROM: THE LOW BOILER CONCENTRATE WITHDRAWN FROM THE LOW BOILER COLUMN IS TREATED WITH GASEOUS CHLORINE AT TEMPERATURES OF BETWEEN 10 AND 120*C., UNDER PRESSURES OF BETWEEN 1 AND 3 ATMOSPHERES ABSOLUTE, WITH IRRADIATION FO UTLRAVIOLET AND/OR VISIBLE LIGHT IN THE ABSENCE OF CATALYSTS, AND THE CHLORINE-TREATED LOW BOILER CONCENTRATE RECYCLED TO THE SAID LOW BOILER COLUMN; MATERIAL ACCUMULATING IN THE BASE OF THE SAID LOW BOILER COLUMN IS CONTINUOUSLY DELIVERED FROM THE LOW BOILER COLUMN TO A HIGH BOILER COLUMN; AND PURE DICHLOROETHANE IS DISTILLED OFF FROM THE HIGH BOILER CONTAMINANTS IN THE HIGH BOILER COLUMN.