Abstract: A process for preparing chlorine by gas-phase oxidation of hydrogen chloride by means of a gas stream comprising molecular oxygen in the presence of a fixed-bed catalyst, which is carried out in a reactor (1) having a bundle of parallel catalyst tubes (2) which are aligned in the longitudinal direction of the reactor and are fixed at their ends into tube plates (3), with a cap (4) at each end of the reactor (1) and with one or more deflection plates (6) which are arranged perpendicular to the longitudinal direction of the reactor in the intermediate space (5) between the catalyst tubes (2) and leave passages (7) located alternately on opposite sides of the reactor free next to the interior wall of the reactor (1), with the catalyst tubes (2) being charged with the fixed-bed catalyst, the hydrogen chloride and the gas stream comprising molecular oxygen being passed from one end of the reactor via a cap (4) through the catalyst tubes (2) and the gaseous reaction mixture being taken off from the opposite end of

Abstract: A process for preparing chlorine by gas-phase oxidation of hydrogen chloride by means of a gas stream comprising molecular oxygen in the presence of a fixed-bed catalyst, which is carried out in a reactor (1) having a bundle of parallel catalyst tubes (2) which are aligned in the longitudinal direction of the reactor and are fixed at their ends into tube plates (3), with a cap (4) at each end of the reactor (1) and with one or more annular deflection plates (6) which are arranged perpendicular to the longitudinal direction of the reactor in the intermediate space (5) between the catalyst tubes (2) and leave circular passages (8) free in the middle of the reactor and one or more disk-shaped deflection plates (7) which leave annular passages (9) free at the edge of the reactor, with an alternating arrangement of annular deflection plates (6) and disk-shaped deflection plates (7) with the catalyst tubes (2) being charged with the fixed-bed catalyst, the hydrogen chloride and the gas stream comprising molecular o

Abstract: Iron oxides are upgraded by calcining at from 700 to 1200° C.

Abstract: Process for preparing chlorine by catalytic gas-phase oxidation of hydrogen chloride over a fixed catalyst bed, which comprises the steps:

Abstract: Process for preparing organic isocyanates, which comprises the steps

Abstract: Shaped catalysts for heterogeneously catalyzed reactions are in the form of hollow cylinders or annular tablets whose end faces are rounded both to the outer edge and to the edge of the central hole, i.e. have no right-angled edges.

Abstract: A process for the preparation of 1,2-dichloroethane by oxychlorination of ethene in the presence of a copper-containing fixed-bed catalyst comprising a bed essentially consisting of catalyst particles which comprise, at least partially, support material impregnated with an active component and, if desired, a promoter, where the catalyst bed comprises essentially no separate inert material for dilution.

Abstract: A process for removing chloride from chloridic iron oxide comprises mixing said chloridic iron oxide with an acid and subsequently conducting a thermal treatment at from 50 to 1300° C.

Abstract: Catalysts for heterogeneously catalyzed reactions which comprise active components and a catalyst support comprising amounts of &dgr;-Al2O3 which can be detected by X-ray diffractometry, in particular for the oxychlorination of ethylene to 1,2-dichloroethane.

Abstract: Shaped catalysts for heterogeneously catalyzed reactions are in the form of hollow cylinders or annular tablets whose end faces are rounded both to the outer edge and to the edge of the central hole, i.e. have no right-angled edges.

Abstract: A process for the preparation of 1,2-dichloroethane by oxychlorination of ethene in the presence of a copper-containing fixed-bed catalyst comprising a bed essentially consisting of catalyst particles which comprise, at least partially, support material impregnated with an active component and, if desired, a promoter, where the catalyst bed comprises essentially no separate inert material for dilution.