Ammonia still apparatus

Claim 1

COKE OVEN BY-PRODUCT RECOVERY EQUIPMENT COMPRISING: AN AMMONIA STILL HAVING A FREE LEG COMPRISING AS UPPER SHELL PORTION WITH SUPERPOSED BUBBLE CAP TRAYS THEREIN AND A FIXED LEG COMPRISING A LOWER SHELL PORTION WITH SUPERPOSED BUBBLE CAP TRAYS THEREIN WITH THE TRAYS SPACED FROM EACH OTHER IN EACH LEG SO THAT THE DISTANCE BETWEEN THE TRAY ABOVE AND THE TRAY BELOW EVERY ONE OF THE TRAYS IS A MINIMUM OF AT LEAST THREE FEET, SAID FIXED LEG COMMUNICATING ABOVE ITS TRAYS WITH THE FREE LEG BELOW ITS TRAYS FOR PASSAGE OF VAPORS FROM THE FIXED LEG TO THE FREE LEG OF THE STILL, MEANS FOR THE INLET OF AMMONIACAL GAS LIQUOR TO THE STILL AT AN UPPER TRAY OF THE FREE LEG, MEANS FOR OFF-FLOW OF AMMONIA VAPORS FROM THE STILL AT A LEVEL ABOVE SAID INLET MEANS TO THE FREE LEG, MEANS FOR INLET OF STEAM TO THE FIXED LEG BELOW THE TRAYS THERIN, MEANS FOR CONTINOUUS WITHDRAWAL OF GAS LIQUOR FROM A LOWER TRAY OF THE FREE LEG TO THE EXTERIOR OF THE STILL SHELL, MEANS FOR CONTIUOUS SUPPLY OF THE LIME SLURRY TO SAID WITHDRAWN LIQUOR, MEANS FOR CONTINUOUSLY MIXING AND INTRODUING SAID LIME SLURRY AND SAID WITHDRAWN GAS LIQUOR TO SAID FIXED LET AT AN UPPER TRAY THEREIN, MEANS FOR WITHDRAWAL OF AMMONIA STILL WASTE FROM THE FIXED-LEG AT A LEVEL BELOW THE TRAYS THEREIN, AND OVERFLOW WEIR MEANS INTERCONNECTING SAID TRAYS FOR SERIAL DOWNFLOW OF GAS LIQUOR OVER THE TRAYS OF THE FREE AND FIXED LEGS, SAID OVERFLOW WEIR MEANS COMPRISING FRAMED ACCESS PASSAGEWAY INDIVIDUALIZED EACH TO ONE OF THE RESPECTIVE BUBBLE CAP TRAYS, EACH FRAMED PASSAGEWAY COMPRISING A FRAME WHICH IS OF A MINIMUM LENGTH AND HEIGHT OF AT LEAST THREE FEET AND IS FIRMLY CONNECTED TO THE SHELL PORTIONS SURROUNDING THE TRAYS AT THE PERIMETER THEREOF, AND WHICH PROVIDES A PASSAGEWAY THAT EXTENDS FROM, AND IS UNOBSTRUCTED FROM, THE REGION OF THE BASE OF THE NEXT SUBADJACENT TRAY UPWARDLY TO A REGION BETWEEN THE TOP OF THE BUBBLE CAPS OF ITS RESPECTIVE TRAY AND THE BASE OF THE NEXT TRAY ABOVE, AN OVERFLOW CONDUIT FOR EACH FRAME PROJECTING BEYOND THE EXTERIOR OF THE SHELL AND DETACHABLY SECURED TO THE RESPECTIVE FRAMES INDIVIDUALLY, SAID CONDUITS EACH BEING OF A HEIGHT AND PERIMETRICAL LENGTH CORRESPONDING TO THE HEIGHT AND LENGTH OF ITS FRAME TO CORRESPOND WITH THE PROPORTION OF THE DIAMETER OF THE SURFACES OF THE TRAYS REQUIRED FOR SERVICE AS THEIR WEIRS, A WEIR PLATE DETACHABLY CONNECTED TO EACH FRAME INTERMEDIATE THE SAME AND THE CONDUIT THEREFOR, EACH WEIR PLATE BEING OF THE SAME PERIMETRICAL LENGTHS AS ITS FRAME AND HAVING AN UPPER TERMINAL OUTFLOW EDGE AND A LOWER TERMINAL INFLOW EDGE WITH TEH UPPER TERMINAL OUTFLOW EDGE LOCATED AT A SPACED DISTANCE ABOVE THE TOP OF THE TRAY INDIVIDUALIZED TO ITS FRAME AND AT A REGION ABOVE SAID TRAY AND BELOW THE PORTION OF THE FRAME ABOVE SAID CAP TOPS OF SAID TRY FOR MAINTAINING A LIQUID SEAL AT SAID CAPS BY OUTFLOW FROM THE TRAY TO THE CONDUIT, AND WITH THE LOWER TERMINAL INFLOW EDGE OF EACH WEIR PLATE LOCATED AT A SPACED DISTANCE BELOW THE BASE OF THE TRAY INDIVIDUALIZED TO ITS FRAME, AT A LEVEL ABOVE THE PORTION OF ITS FRAME THAT IS IN THE REGION OF THE BASE OF THE NEXT TRAY BELOW BUT BELOW THE UPPER OUTFLOW EDGE FOR THE WEIR PLATE FOR SAID TRAY BELOW, FOR INFLOW FROM THE CONDUIT TO SAID TRAY BELOW WHILE CONCURRENTLY SEALING OFF STEAM VAPORS FROM FLOWING FROM SAID TRAY BELOW TO SAID CONDUIT.