Abstract 1. IN THE PROCESS OF RECOVERING AN ACID MIXTURE CONTAINING NITRIC ACID AND HYDROFLUORIC ACID FROM A WASTE PICKLE LIQUOR SOLUTION CONTAINING THE ACID AND METAL SALTS THEREOF DISSOLVED THEREIN, WHEREIN SULFURIC ACID IS ADDED TO THE WASTE PICKLE LIQUOR SOLUTION AND THE RESULTING SOLUTION IS BOILED UNDER REDUCED PRESSURE TO EVAPORATE THE ACID MIXTURE, THE IMPROVEMENT WHEREIN SAID WASTE PICKLE LIQUOR SOLUTION IS DILUTED WITH SULFURIC ACID IN AN AMOUNT TO REDUCE THE CONCENTRATION OF NITRIC ACID IN THE DILUTED SOLUTION BELOW 0.2% BY WEIGHT IN THE EVAPORATION SYSTEM AND THE SO-DILUTED SOLUTION IS BOILED UNDER REDUCED PRESSURE TO EVAPORATE THE ACID MIXTURE WHILE SULFURIC ACID, IS SUBJEC LIQUOR SOLUTION, DILUTED WITH SULFURIC ACID, IS SUBJECTED TO FORCED CIRCULATION BETWEEN AN EVAPORATOR AND CIRCULATION PIPING FITTED TO THE EVAPORATOR, THE CIRCULATON HAVING AT LEAST ONE HEATING ELEMENT MADE OF IMPERVIOUS CARBON OR IMPERVIOUS GRPAHITE AND AT LEAST ONE GAS LIFT IS PROVIDED INTO WHICH IS INTRODUCED FRESH AIR OR A NON-CONDENSABLE GAS, SEPARATED FROM THE VAPOR BOILED OFF DURING EVAPORATION.
IN THE PROCESS OF RECOVERING AN ACID MIXTURE CONTAINING NITRIC ACID AND HYDROFLUORIC ACID FROM A WASTE PICKLE LIQUOR SOLUTION CONTAINING THE ACID AND METAL SALTS THEREOF DISSOLVED THEREIN, WHEREIN SULFURIC ACID IS ADDED TO THE WASTE PICKLE LIQUOR SOLUTION AND THE RESULTING SOLUTION IS BOILED UNDER REDUCED PRESSURE TO EVAPORATE THE ACID MIXTURE, THE IMPROVEMENT WHEREIN SAID WASTE PICKLE LIQUOR SOLUTION IS DILUTED WITH SULFURIC ACID IN AN AMOUNT TO REDUCE THE CONCENTRATION OF NITRIC ACID IN THE DILUTED SOLUTION BELOW 0.2% BY WEIGHT IN THE EVAPORATION SYSTEM AND THE SO-DILUTED SOLUTION IS BOILED UNDER REDUCED PRESSURE TO EVAPORATE THE ACID MIXTURE WHILE SULFURIC ACID, IS SUBJEC LIQUOR SOLUTION, DILUTED WITH SULFURIC ACID, IS SUBJECTED TO FORCED CIRCULATION BETWEEN AN EVAPORATOR AND CIRCULATION PIPING FITTED TO THE EVAPORATOR, THE CIRCULATON HAVING AT LEAST ONE HEATING ELEMENT MADE OF IMPERVIOUS CARBON OR IMPERVIOUS GRPAHITE AND AT LEAST ONE GAS LIFT IS PROVIDED INTO WHICH IS INTRODUCED FRESH AIR OR A NON-CONDENSABLE GAS, SEPARATED FROM THE VAPOR BOILED OFF DURING EVAPORATION.
Claim 2
Dependent Claim
170 words
IN THE PROCESS OF RECOVERING AN ACID MIXTURE CONTAINING NITRIC ACID AND HYDROFLUORIC ACID FROM A WASTE PICKLE LIQUOR SOLUTION CONTAINING THE ACID AND METAL SALTS THEREOF DISSOLVED THEREIN, WHEREIN SULFURIC ACID IS ADDED TO THE WASTE PICKLE LIQUOR SOLUTION AND THE RESULTING SOLUTION IS BOILED UNDER REDUCED PRESSURE TO EVAPORATE THE ACID MIXTURE, THE IMPROVEMENT WHEREIN SAID WASTE PICKLE LIQUOR SOLUTION IS DILUTED WITH SULFURIC ACID IN AN AMOUNT TO REDUCE THE CONCENTRATION OF NITRIC ACID IN THE DILUTED SOLUTION BELOW 0.2% BY WEIGHT IN THE EVAPORATION SYSTEM AND THE SO-DILUTED SOLUTION IS BOILED UNDER REDUCED PRESSURE TO EVAPORATE THE ACID MIXTURE WHILE SULFURIC ACID, IS SUBJEC LIQUOR SOLUTION, DILUTED WITH SULFURIC ACID, IS SUBJECTED TO FORCED CIRCULATION BETWEEN AN EVAPORATOR AND CIRCULATION PIPING FITTED TO THE EVAPORATOR, THE CIRCULATON HAVING AT LEAST ONE HEATING ELEMENT MADE OF IMPERVIOUS CARBON OR IMPERVIOUS GRPAHITE AND AT LEAST ONE GAS LIFT IS PROVIDED INTO WHICH IS INTRODUCED FRESH AIR OR A NON-CONDENSABLE GAS, SEPARATED FROM THE VAPOR BOILED OFF DURING EVAPORATION.