Abstract 1. IN A PROCESS FOR DECREASING THE TOTAL SULFUR CONTENT OF HYDROGEN SULFIDE AND SULFUR DIOXIDE-CONTAINING OFF-GASES FROM A CLAUS PROCESS WHEREIN THE CLAUS OFF-GASS ARE PASSED WITH A HYDROGEN OR CARBON-MONOXIDE-CONTAINING REDUCING GAS OVER A METAL CATALYST WHEREBY SULFUR DIOXIDE IS REDUCED TO HYDROGEN SULFIDE AND THE HYDROGEN SULFIDE IS SUBSEQUENTLY REMOVED WITH THE USE OF A HYDROGEN SULFIDE-SELECTIVE ADSORBENT OR ABSORBENT, THE IMPROVEMENT WHICH COMPRISES: ADDING HYDROCARBON OR CARBON DIOXIDE AND AIR TO THE FEED OF SAID CLAUS PROCESS IN AN AMOUNT SUFFICIENT TO FORM IN THE OFF-GAS FROM SAID PROCESS SUBSTANTIALLY ALL OF THE REDUCING GAS REQUIRED TO EFFECT REDUCTION OF SULFUR DIOXIDE TO HYDROGEN SULFIDE IN THE PRESENCE OF SAID METAL CATALYST.
IN A PROCESS FOR DECREASING THE TOTAL SULFUR CONTENT OF HYDROGEN SULFIDE AND SULFUR DIOXIDE-CONTAINING OFF-GASES FROM A CLAUS PROCESS WHEREIN THE CLAUS OFF-GASS ARE PASSED WITH A HYDROGEN OR CARBON-MONOXIDE-CONTAINING REDUCING GAS OVER A METAL CATALYST WHEREBY SULFUR DIOXIDE IS REDUCED TO HYDROGEN SULFIDE AND THE HYDROGEN SULFIDE IS SUBSEQUENTLY REMOVED WITH THE USE OF A HYDROGEN SULFIDE-SELECTIVE ADSORBENT OR ABSORBENT, THE IMPROVEMENT WHICH COMPRISES: ADDING HYDROCARBON OR CARBON DIOXIDE AND AIR TO THE FEED OF SAID CLAUS PROCESS IN AN AMOUNT SUFFICIENT TO FORM IN THE OFF-GAS FROM SAID PROCESS SUBSTANTIALLY ALL OF THE REDUCING GAS REQUIRED TO EFFECT REDUCTION OF SULFUR DIOXIDE TO HYDROGEN SULFIDE IN THE PRESENCE OF SAID METAL CATALYST.
Claim 2
Dependent Claim
115 words
IN A PROCESS FOR DECREASING THE TOTAL SULFUR CONTENT OF HYDROGEN SULFIDE AND SULFUR DIOXIDE-CONTAINING OFF-GASES FROM A CLAUS PROCESS WHEREIN THE CLAUS OFF-GASS ARE PASSED WITH A HYDROGEN OR CARBON-MONOXIDE-CONTAINING REDUCING GAS OVER A METAL CATALYST WHEREBY SULFUR DIOXIDE IS REDUCED TO HYDROGEN SULFIDE AND THE HYDROGEN SULFIDE IS SUBSEQUENTLY REMOVED WITH THE USE OF A HYDROGEN SULFIDE-SELECTIVE ADSORBENT OR ABSORBENT, THE IMPROVEMENT WHICH COMPRISES: ADDING HYDROCARBON OR CARBON DIOXIDE AND AIR TO THE FEED OF SAID CLAUS PROCESS IN AN AMOUNT SUFFICIENT TO FORM IN THE OFF-GAS FROM SAID PROCESS SUBSTANTIALLY ALL OF THE REDUCING GAS REQUIRED TO EFFECT REDUCTION OF SULFUR DIOXIDE TO HYDROGEN SULFIDE IN THE PRESENCE OF SAID METAL CATALYST.