Production of paper pulp

Claim 1

IN THE SULFATE PROCESS FOR PRODUCING PAPER PULP FROM RESINOUS WOOD WHEREIN THE BLACK LIQUOR AS RECEIVED FROM THE PULP WASHERS IS ACCOMPANIED BY ENTRAINED INSOLUBLE SOAP AND ENTRAPPED AIR WHICH CAUSE FOAMING AND CLOGGING OF EQUIPMENT AND WHEREIN A MAJOR PORTION OF THE BLACK LIQUOR RECEIVED FROM THE PULP WASHERS IS RECYCLED AS DILUTION LIQUOR AND A MINOR PORTION OF THE BLACK LIQUOR RECEIVED FROM THE PULP WASHERS IS THEREAFTER OXIDIZED AND SUBSEQUENTLY TREATED IN A CHEMICAL RECOVERY SYSTEM IN WHICH THE OXIDIZED LIQUOR IS SUBJECTED TO PROCESSING STEPS WHICH INCLUDE THE CONCENTRATION OF THE OXIDIZED STEPS WHICH INCLUDE THE CONCENTRATION OF THE OXIDIZED LIQUOR BY EVAPORATION AND THE BURNING OF THE CONCENTRATED LIQUOR IN A FURNACE, THE IMPROVED METHOD OF HANDLING AND TREATING THE BLACK LIQUOR PRIOR TO THE RECYCLE OF SAID MAJOR PORTION AS DILUTION LIQUOR AND PRIOR TO THE TREATMENT OF SAID MINOR PORTION IN SAID RECOVERY SYSTEM COMPRISING CONTINUOUSLY WITHDRAWING A PORTION OF SAID COLLECTED LIQUOR FROM SAID TANK FOR RECYCLE AS SAID DILUTION LIQUOR THE WITHDRAWN PORTION BEING REMOVED FROM BELOW THE SURFACE OF THE COLLECTED LIQUOR IN SAID TANK AND THEREBY BEING RELATIVELY FREE OF INSOLUBLE SOAP AND FOAM, CONTINOUSLY WITHDRAWING ANOTHER PORTION OF SAID COLLECTED LIQUOR FROM SAID TANK AND THEREAFTER OXIDIZING THE WITHDRAWN OTHER PORTION IN AN OXIDATION TOWER BY THEREIN CONTACTING SAID WITHDRAWN OTHER PORTION WITH AIR, SAID OTHER PORTION OF SAID COLLECTED LIQUOR CONSTITUTING AT LEAST A PART OF SAID MINOR PORTION AND BEING WITHDRAWN