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Method of obtaining pulps usable in the paper-making or other industries, from wood or annual plants, and the pulps resulting therefrom

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1. IN A PROCESS OF DELIGNIFYING CELLULOSIC RAW MATERIALS SUCH AS WOOD AND ANNUAL PLANTS WHICH HAVE NOT BEEN PREVIOUSLY CHEMICALLY TREATED FOR THE REMOVAL OF LIGNIN THEREFROM, THE STEPS OF DIVIDING THE RAW MATERIAL INTO A VERY FINELY DIVIDED STATE, TREATING THE FINELY DIVIDED MATERIAL WITH A HOT, WEAK AQUEOUS SOLUTION OF SODIUM HYDROXIDE TO REMOVE RESINS AND GREASES, TREATING THE RESULTING MATERIAL WITH A CHLORINATING SOLUTION AT ATMOSPHERIC TEMPERATURE AND PRESSURE, FOR A PERIOD OF THREE TO SEVEN MINUTES, THE PH OF SAID SOLUTION BEING BETWEEN 3 AND 3.5, THE PH OF THE SOLUTION REMAINING IN THIS RANGE DURING THE TREATMENT WITH SAID CHLORINATING SOLUTION, AND REMOVING THE CHLORO-LIGNINS FORMED DURING THE TREATMENT WITH SAID CHLORINATING SOLUTION BY SUBJECTING THE MATERIAL TO THE ACTION OF A WEAK ALKALINE SOLUTION TO DISSOLVE THE CHLORO-LIGNINS.
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