Decolorizing kraft waste liquors
阅读：11发布：2023-04-25
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1. IN A METHOD FOR THE PRODUCTION OF BLEACHED WOOD PULP INCLUDING BORADLY THE STEPS OF DIGESTING THE RAW WOOD ACCORDING TO THE KRAFT PROCESS AND SUBSEQUENTLY BLEACHING SAID DIGESTED WOOD TO THEREBY PRODUCE A BLEACHED PULP AND A SPENT BLEACH LIQUOR, SAID KRAFT PROCESS INCLUDING MORE SPECIFICALLY THE STEPS OF DIGESTING THE WOOD IN A KRAFT WHITE LIQUOR (SODIUM HYDROXIDE AND SODIUM SULFIDE) TO THEREBY PRODUCE A WOOD PULP AND SPENT DIGESTION LIQUOR (BLLACK LIQUOR), CONCENTRATING SAID BLACK DIGESTION LIQUOR BY EVAPORATION AND BURNING IN THE BLACK LIQUOR RECOVERY FURNACE TO PRODUCE A SMELT (INORGANIC SALTS), DISSOLVING THE SMELT IN AN AQUEOUS LIQUOR TO YIELD A GREEN LIQUOR, AND CAUSTICIZING THE GREEN LIQUOR WITH LIME TO PRODUCE A WHITE LIQUOR, THE IMPROVEMENT IN RIDDING THE SPENT BLEACH LIQUOR OF ORGANIC COLOR BODIES WHICH COMPRISES TREATING THE SPENT BLEACH LIQUOR CONTAINING THE ORGANIC COLOR BODIES WITH LIME THEREBY TO ADSORB SAID COLOR BODIES ON SAID LIME, SEPARATING THE LIME FROM A SUBSTANTIAL PORTION OF THE TREATED SPENT BLEACH LIQUOR, REACTING THE SEPARATED LIME AND GREEN LIQUOR FROM THE KRAFT DIGESTION PROCESS FOR A PERIOD OF TIME SUFFICIENT TO CONVERT A SUBSTANTIAL AMOUNT OF THE SODIUM CARBONATE PRESENT IN THE GREEN LIQUOR TO SODIUM HYDROXIDE AND CALCIUM CARBONATE AND TO DISSOLVE THE COLOR BODIES IN THE AQUEOUS SODIUM HYDROXIDE SOLUTION (WHITE LIQUOR), SEPARATING THE AQUEOUS HYDROXIDE SOLUTIONS FROM THE LIMECALCIUM CARBONATE SOLIDS, PASSING THE WHITE LIQUOR TO THE PULP DIGESTERS AND SUBSEQUENTLY PASSING THE BLACK LIQUOR RESULTING FROM THE DIGESTION PROCESS TO THE BLACK LIQUOR RECOVERY FURNACE WHEREIN THE ORGANIC COLOR BODIES ARE BURNED AND DESTROYED.
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