Dual cycle treatment of sulfur dioxide containing flue gas and the like
Abstract
Abstract A METHOD IS PROVIDED FOR TREATING FLUE GAS AND THE LIKE FOR SULFUR DIOXIDE REMOVAL AND RECOVERY. THE GAS, CONTAINING A MINOR BUT POLLUTING AMOUNT OF SULFUR DIOXIDE AND SUBSTANTIALLY NO SULFUR TRIOXIDE, IS CONTACTED WITH AMMONIA IN THE PRESENCE OF WATER TO FORM AN AMMONIUM SULFITE. THIS IS SEPARATED AND, IN THE ABSENCE OF OXYGEN, REACTED WITH AN AQUEOUS ALKALINE EARTH METAL OXIDE OR WITH ZINC OXIDE TO LIBERATE THE AMMONIA FOR RECYCLE AND TO FORM INSOLUBLE ALKALINE EARTH METAL OR ZINC SULFITE. THE LATTER IS DRIED, DEHYDRATED, AND THERMALLY DECOMPOSED TO LIBERATE A CONCENTRATED STREAM OF SULFUR DIOXIDE AND TO FORM ALKALINE EARTH METAL OXIDE OR ZINC OXIDE FOR RECYCLE. PROCEDURES ARE DISCLOSED FOR EFFICIENTLY CONDUCTING THE ABOVE PROCESSING STEPS AND OPERATIONS.
Inventors
- 👤 Everett Douglas Cann
Bibliographic Details
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