Title:
METHOD FOR ACTIVATING AND REGENERATING CHROMIUM TYPE FLUORINATING CATALYST
Document Type and Number:
Japanese Patent JP3248923
Kind Code:
B2
Abstract:
PURPOSE: To repeatedly activate a catalyst lowered in its activity, in the activation and regeneration of a fluorinating catalyst of halogenated hydrocarbon based on chromium, by successively applying oxidizing treatment and reducing treatment whose temp. ranges are respectively specified to the used catalyst.
CONSTITUTION: When a fluorinating catalyst of halogenated hydrocarbon based on chromium used as an aerosol, a refrigerant, a foaming agent or a solvent lowered in its activity is activated, at first, oxidizing treatment bringing said catalyst into contact with oxidative-gas (O2, N2O or O3) at 150-500°C is performed and, subsequently, reducing treatment bringing the catalyst into contact with reductive gas (H2, CO or NO) at 100-500°C is performed. In succession to these treatments, reaction may be resumed immediately but it is pref. to resume reaction after the catalyst is again treated with HF. By these treatments, the activity of the catalyst can be restored up to the initial activity level without scattering effective components.
Inventors:
Katsuyuki Tsuji
Seiichi Tomoda
Kimitaka Ohshiro
Shuji Hirayama
Hidetoshi Nakayama
Seiichi Tomoda
Kimitaka Ohshiro
Shuji Hirayama
Hidetoshi Nakayama
Application Number:
JP12619691A
Publication Date:
January 21, 2002
Filing Date:
May 29, 1991
Export Citation:
Assignee:
SHOWA DENKO K.K.
International Classes:
B01J23/92; B01J27/32; B01J38/04; C07C17/04; C07C17/20; C07C19/08; (IPC1-7): B01J38/04; B01J23/92; B01J27/32; C07C17/04; C07C17/20; C07C19/08
Domestic Patent References:
| JP1262946A | ||||
| JP2167238A |
Attorney, Agent or Firm:
Masatake Shiga (2 outside)