Processes of preparing cooking liquor for neutral sulphite digestion of cellulosic material

Claim 1

IN A NEUTRAL SULFITE DIGESTION PROCESS FOR PRODUCING SEMI-CHEMICAL PULP FROM CELLULOSIC MATERIAL WITH A NEUTRAL SULFITE COOKING LIQUOR CONSISTING OF A SOLUTION OF NEUTRAL SULFITE COOKING SOLIDS, SAID SOLUTION CONTAINING SODIUM MONOSULFITE AS THE ACTIVE COOKING AGENT AND HAVING A PH OF ABOUT 6-10, WHICH PROCESS NORMALLY RESULTS IN A WASTE LIQUOR HAVING A CONTENT OF DISSOLVED COMBUSTIBLE SOLIDS INSUFFICIENT TO PERMIT AN ECONOMICAL REGENERATION THEREOF, THE IMPROVEMENT OF INCREASING THE CONTENT OF COMBUSTIBLE SOLIDS IN SAID WASTE LIQUOR TO PERMIT REGENERATION THEREOF BY EVAPORATION AND COMBUSTION AND SIMULTANEOUSLY FORTIFYING THE COOKING LIQUOR WITH ACTIVE COOKING AGENT WHICH COMPRISES PREPARING THE SAID COOKING LIQUOR FROM A SOLUTION IN BISULFITE WASTE LIQUOR OF SAID NEUTRAL COOKING LIQUOR SOLIDS, SAID BISULFITE WASTE LIQUOR SUPPLYING TO SAID COOKING LIQUOR BOTH COMBUSTIBLE SOLIDS FOR COMBUSTION DURING REGENERATION AND SULFITE COMPOUNDS WHICH DIRECTLY AT SAID PH FORM SODIUM MONOSULFITE, DIGESTING SAID CELLULOSIC MATERIAL IN THE COOKING LIQUOR AND REGENERATING THE WASTE LIQUOR FROM SAID DIGESTION BY EVAPORATION AND COMBUSTION, SAID BISULFITE WASTE LIQUOR BEING OBTAINED FROM THE INDEPENDENT BISULFITE DIGESTION OF ADDITIONAL CELLULOSIC MATERIAL.