Method of bleaching wood pulp
First Claim
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3. A PROCESS FOR COMPLETING THE BLEACHING OF PARTIALLY BLEACHED CHEMICAL WOOD PULP COMPRISING THE STEPS OF ADDING CHLORINE DIOXIDE TO AN AQUEOUS SUSPENSION OF SAID PULP, PERMITTING SAID CHLORINE DIOXIDE TO ACT ON SAID PULP FOR A SUBSTANTIAL LENGTH OF TIME. MAINTAINING THE PH WITHIN THE RANGE OF 7 TO 10 DURING SUCH ACTION, AND AFTER SUBSTANTIALLY EXHAUSTING THE CHLORINE DIOXIDE AS AN ACTIVE BLEACHANT IN THE RESULTING SUSPENSION ADDING TO SAID PULP A QUANTITY OF AN ALKALINE HYPOCHLORITE AND AN ALKALINE HYDROXIDE WHEREBY TO PRODUCE WITHOUT SUBSTANTIAL DEGRADATION A BLEACHED PULP HAVING A BRIGHTNESS IN THE RANGE OF 90 TO 98.7 AND SUITABLE FOR CONVERSION INTO CELLULOSE DERIVATIVES.
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3 Claims
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3. A PROCESS FOR COMPLETING THE BLEACHING OF PARTIALLY BLEACHED CHEMICAL WOOD PULP COMPRISING THE STEPS OF ADDING CHLORINE DIOXIDE TO AN AQUEOUS SUSPENSION OF SAID PULP, PERMITTING SAID CHLORINE DIOXIDE TO ACT ON SAID PULP FOR A SUBSTANTIAL LENGTH OF TIME. MAINTAINING THE PH WITHIN THE RANGE OF 7 TO 10 DURING SUCH ACTION, AND AFTER SUBSTANTIALLY EXHAUSTING THE CHLORINE DIOXIDE AS AN ACTIVE BLEACHANT IN THE RESULTING SUSPENSION ADDING TO SAID PULP A QUANTITY OF AN ALKALINE HYPOCHLORITE AND AN ALKALINE HYDROXIDE WHEREBY TO PRODUCE WITHOUT SUBSTANTIAL DEGRADATION A BLEACHED PULP HAVING A BRIGHTNESS IN THE RANGE OF 90 TO 98.7 AND SUITABLE FOR CONVERSION INTO CELLULOSE DERIVATIVES.
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Current AssigneeHoward Rapson William
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Original AssigneeHoward Rapson William
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InventorsHOWARD RAPSON WILLIAM
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Application NumberUS03/080,560Time in Patent Office1,084 DaysField of SearchUS Class Current162/87CPC Class CodesD21C 9/144 with ClO2/Cl2 and other ble...
