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Chemical recovery and control in the kraft pulp process

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1. THE METHOD OF REGENERATING SODA PULP COOKING LIQUOR WHICH COMPRISES CONCENTRATION USED COOKING LIQUOR BY EVAPORATION, ADDING SALT CAKE TO THE CONCENTRATED LIQUOR, HEATING THE SALT CAKE CONTAINING CONCENTRATED LIQUOR AND DESTRUCTIVELY DISTILLING AND CARBONIZING SAID LIQUOR WITH FLUE GASES WHILE PREVENTING EXPOSURE OF SAID LIQUOR TO SAID GASES TO OBTAIN A DISTILLATE AND A SUBSTANTIALLY CARBONIZED RESIDUE FROM SAID CONCENTRATED LIQUOR, SEPARATING HYDROGEN SULFIDE FROM THE DISTILLATE, BURNING SAID RESIDUE TO FORM A MELT OF INORGANIC SALTS AND DISSOLVING THE INORGANIC SALTS IN AQUEOUS SOLUTION, CAUSTICIZING THE INORGANIC
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