Abstract 1. IN THE BLEACHING OF CELLULOSE PULP BY THE ALKALINE OXYGEN GAS PROCESS, IN WHICH A GAS CONTAINING OXYGEN IS INTRODUCED INTO THE PULP IN THE PRESENCE OF ALKALI, WHICH CAN BE SELECTED FROM THE GROUP CONSISTING OF SODIUM HYDROXIDE AND SODIUM CARBONATE AND WHICH OPTIONALLY MAY CONTAIN SODIUM SULFIDE, THE IMPROVEMENT WHICH COMPRISES FIRST IMPREGNATED UNDER SUPERATMOSPHERE PRESSURE CELLULOSE PULP OBTAINED FROM A CONTINUOUS PULPING OR DIGESTION PROCESS AND CONTAINING SPENT PULPING LIQUOR WITH WASTE ALKALINE OXYGEN GAS BLEACHING LIQUOR IN ORDER TO DISPLACE A MAJOR PORPORTION OF THE PULPING CHEMICALS FROM THE CELLULOSE PULP BUT RETAIN A MINOR PROPORTION OF SUCH CHEMICALS, AND THEN IMPREGNATING UNDER SUPERATMOSSPHERIC PRESSURE THE RESULTING PULP WITH ALKALI TO BE EMPLOYED IN THE ALKALINE OXYGEN GAS BLEACHING.
Inventors
👤 H Samuelson
👤 I Croon
Bibliographic Details
Application Number—
JurisdictionUS
Data Sourcegoogle_patents
Last Synchronized2026-11-09 04:33
CPC Classifications
D; D21; D21C; D21C9/00; D21C9/10; D21C9/1026
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
123 words
IN THE BLEACHING OF CELLULOSE PULP BY THE ALKALINE OXYGEN GAS PROCESS, IN WHICH A GAS CONTAINING OXYGEN IS INTRODUCED INTO THE PULP IN THE PRESENCE OF ALKALI, WHICH CAN BE SELECTED FROM THE GROUP CONSISTING OF SODIUM HYDROXIDE AND SODIUM CARBONATE AND WHICH OPTIONALLY MAY CONTAIN SODIUM SULFIDE, THE IMPROVEMENT WHICH COMPRISES FIRST IMPREGNATED UNDER SUPERATMOSPHERE PRESSURE CELLULOSE PULP OBTAINED FROM A CONTINUOUS PULPING OR DIGESTION PROCESS AND CONTAINING SPENT PULPING LIQUOR WITH WASTE ALKALINE OXYGEN GAS BLEACHING LIQUOR IN ORDER TO DISPLACE A MAJOR PORPORTION OF THE PULPING CHEMICALS FROM THE CELLULOSE PULP BUT RETAIN A MINOR PROPORTION OF SUCH CHEMICALS, AND THEN IMPREGNATING UNDER SUPERATMOSSPHERIC PRESSURE THE RESULTING PULP WITH ALKALI TO BE EMPLOYED IN THE ALKALINE OXYGEN GAS BLEACHING.
Claim 2
Dependent Claim
123 words
IN THE BLEACHING OF CELLULOSE PULP BY THE ALKALINE OXYGEN GAS PROCESS, IN WHICH A GAS CONTAINING OXYGEN IS INTRODUCED INTO THE PULP IN THE PRESENCE OF ALKALI, WHICH CAN BE SELECTED FROM THE GROUP CONSISTING OF SODIUM HYDROXIDE AND SODIUM CARBONATE AND WHICH OPTIONALLY MAY CONTAIN SODIUM SULFIDE, THE IMPROVEMENT WHICH COMPRISES FIRST IMPREGNATED UNDER SUPERATMOSPHERE PRESSURE CELLULOSE PULP OBTAINED FROM A CONTINUOUS PULPING OR DIGESTION PROCESS AND CONTAINING SPENT PULPING LIQUOR WITH WASTE ALKALINE OXYGEN GAS BLEACHING LIQUOR IN ORDER TO DISPLACE A MAJOR PORPORTION OF THE PULPING CHEMICALS FROM THE CELLULOSE PULP BUT RETAIN A MINOR PROPORTION OF SUCH CHEMICALS, AND THEN IMPREGNATING UNDER SUPERATMOSSPHERIC PRESSURE THE RESULTING PULP WITH ALKALI TO BE EMPLOYED IN THE ALKALINE OXYGEN GAS BLEACHING.