Process of removing hydrocyanic acid, hydrogen sulfide and ammonia from gases

Claim 1

A METHOD OF PURIFYING COKE OVEN GAS CONTAINING HYDROGEN CYANIDE, HYDROGEN SULFIDE AND AMMONIA AS IMPURITIES, COMPRISING THE STEPS OF PASSING A COOLED, DETARRED COKE OVEN GAS CONTAINING SUBSTANTIALLY ITS ORIGINAL CONTENT OF HYDROGEN CYANIDE, HYDROGEN SULFIDE AND AMMONIA IN A FIRST STAGE THROUGH A PURIFICATION MASS CONSISTING ESENTIALLY OF FERROUS SULFIDE WHICH ABSORBS THE HYDROGEN CYANIDE FROM SAID GAS; PASSING THE THUS HYDROGEN CYANIDE-FREE GAS STILL CONTAINING HYDROGEN SULFIDE AND AMMONIA IN A SECOND STATE THROUGH A PURIFICATION MASS CONSISTING ESSENTIALLY OF IRON OXIDE, WHEREBY HYDROGEN SULFIDE WHICH IS ADAPTED TO ABSORB HYDROGEN FERROUS SULFIDE WHICH IS ADAPTED TO ABSORB HYDROGEN CYANIDE; SUBSTITUTING THE PURIFICATION MASS OF SAID FIRST STAGE WHEN THE SAME HAS BECOME SUBSTANTIALLY SATURATED WITH HYDROGEN CYANIDE WITH THE PURIFICATION MASS OF SAID SECOND STAGE WHICH NOW CONSISTS ESSENTIALLY OF FERROUS SULFIDE WHICH IS ADAPTED TO ABSORB HYDROGEN CYANIDE AND REPLACING SAID PURIFICATION MASS OF SAID SECOND STAGE WITH A FRESH IRON OXIDE PURIFICATION MASS WHICH IS ADAPTED TO ABSORB HYDROGEN SULFIDE; PASSING THE COKE OVEN GAS OBTAINED FROM SAID SECOND PURIFICATION STAGE STILL CONTAINING AMMONIA AND A REDUCED AMOUNT OF HYDROGEN SULFIDE AND BEING SUBSTANTIALLY FREE OF HYDROGEN CYANIDE IN A THIRD STAGE THROUGH LIQUID PURIFIERS ADAPTED TO REMOVE SUBSTANTIALLY ALL OF SAID AMMONIA AND A MAJOR PORTION OF THE REMAINING HYDROGEN SULFIDE FROM SAID GAS BY LIQUID SCRUBBING THEREOF; AND PASSING THE THUS OBTAINED COKE OVEN GAS STILL CONTAINING SOME HYDROGEN SULFIDE AND BEING SUBSTANTIALLY FREE OF AMMONIA AND HYDROGEN CYANIDE IN A LAST STAGE THROUGH A PURIFICATION MASS CONSISTING ESSENTIALLY OF IRON OXIDE WHICH ABSORBS THE REMAINED OF SAID HYDROGEN SULFIDE FROM SAID COKE OVEN GAS, THEREBY OBTAINING A PURIFIED COKE OVEN GAS BEING SUBSTANTIALLY FREE OF HYDROGEN CYANIDE, HYDROGEN SULFIDE AND AMMONIA.

Claim 2

A METHOD OF PURIFYING COKE OVEN GAS CONTAINING HYDROGEN CYANIDE, HYDROGEN SULFIDE AND AMMONIA AS IMPURITIES, COMPRISING THE STEPS OF PASSING A COOLED, DETARRED COKE OVEN GAS CONTAINING SUBSTANTIALLY ITS ORIGINAL CONTENT OF HYDROGEN CYANIDE, HYDROGEN SULFIDE AND AMMONIA IN A FIRST STAGE THROUGH A PURIFICATION MASS CONSISTING ESENTIALLY OF FERROUS SULFIDE WHICH ABSORBS THE HYDROGEN CYANIDE FROM SAID GAS; PASSING THE THUS HYDROGEN CYANIDE-FREE GAS STILL CONTAINING HYDROGEN SULFIDE AND AMMONIA IN A SECOND STATE THROUGH A PURIFICATION MASS CONSISTING ESSENTIALLY OF IRON OXIDE, WHEREBY HYDROGEN SULFIDE WHICH IS ADAPTED TO ABSORB HYDROGEN FERROUS SULFIDE WHICH IS ADAPTED TO ABSORB HYDROGEN CYANIDE; SUBSTITUTING THE PURIFICATION MASS OF SAID FIRST STAGE WHEN THE SAME HAS BECOME SUBSTANTIALLY SATURATED WITH HYDROGEN CYANIDE WITH THE PURIFICATION MASS OF SAID SECOND STAGE WHICH NOW CONSISTS ESSENTIALLY OF FERROUS SULFIDE WHICH IS ADAPTED TO ABSORB HYDROGEN CYANIDE AND REPLACING SAID PURIFICATION MASS OF SAID SECOND STAGE WITH A FRESH IRON OXIDE PURIFICATION MASS WHICH IS ADAPTED TO ABSORB HYDROGEN SULFIDE; PASSING THE COKE OVEN GAS OBTAINED FROM SAID SECOND PURIFICATION STAGE STILL CONTAINING AMMONIA AND A REDUCED AMOUNT OF HYDROGEN SULFIDE AND BEING SUBSTANTIALLY FREE OF HYDROGEN CYANIDE IN A THIRD STAGE THROUGH LIQUID PURIFIERS ADAPTED TO REMOVE SUBSTANTIALLY ALL OF SAID AMMONIA AND A MAJOR PORTION OF THE REMAINING HYDROGEN SULFIDE FROM SAID GAS BY LIQUID SCRUBBING THEREOF; AND PASSING THE THUS OBTAINED COKE OVEN GAS STILL CONTAINING SOME HYDROGEN SULFIDE AND BEING SUBSTANTIALLY FREE OF AMMONIA AND HYDROGEN CYANIDE IN A LAST STAGE THROUGH A PURIFICATION MASS CONSISTING ESSENTIALLY OF IRON OXIDE WHICH ABSORBS THE REMAINED OF SAID HYDROGEN SULFIDE FROM SAID COKE OVEN GAS, THEREBY OBTAINING A PURIFIED COKE OVEN GAS BEING SUBSTANTIALLY FREE OF HYDROGEN CYANIDE, HYDROGEN SULFIDE AND AMMONIA.