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4425317 Recycle of hydrogenated sulfur plant tail gas to sour gas scrubbing system
Lbnservption
& Recycling,
Vol. 7, NOS. 2-4,
PP. 371-376,
1984.
Pergamon Press Ltd.
Printed in Oreat Britain.
NEW PATENTS This Section contains abstracts and where appropriate, illustrations of recently issued United States patents and published patent applications tiled from over 30 countries under the Patent Cooperation Treaty. This information was obtained from recent additions to the Pergamon PATSEARCH@ online database in accordance with interest profiles developed by the Editors. Further information about Pergamon PATSEARCH@ can be obtained from Pergamon International Information Corporation, 1340 Old Chain Bridge Road, McLean, Virginia 22101 U.S.A. Copies of complete patents announced in this Section are available from Pergamon International Information Corporation for@ per copy. Payment with order is required. Orders outside North America add $2 for air postage. Order by patent number from Pergamon International only.
4427376
4425317
APPARATUS FOR HEATING AGGREGATE, RECYCLED ASPHALT AND THE LIKE
RECYCLE OF HYDROGENATED SULFUR PLANT TAIL GAS TO SOUR GAS SCRUBBING SYSTEM
Robert E Etnyre, William H Wylie assigned to Wylie Manufacturing Company
Rainer Zeller, Aldo Belloni, Michae Heisel, Gruenwald, Federal Republic Of Germany assigned to Linde Aktiengesellschaft
A drum-type drier and/or mixer in which particulate material such as aggregate or recycled asphalt is introduced into the forward end of the drum. A burner at the rear end of the drum directs its flame forwardly through an elongated firing tube which extends from the rear end of the drum toward the forward end thereof. The hot gases discharged from the tube strike a baflle, are deflected into an annular chamber between the tube and the drum and then flow rearwardly through the chamber to an exhaust stack. The particulate material also is advanced rearwardly through the chamber and, during such advance, is heated (1) indirectly by the hot gases flowing forwardly through the firing tube and (2) directly by the hot gases deflected into and flowing rearwardly through the chamber.
In a process for the separation of at least carbon dioxide and hydrogen sulfide from a raw gaseous mixture to form a purified gaseous mixture comprising passing said gas through a sour gas removal system including the steps of scrubbing said gaseous mixture with a liquid scrubbing agent having a higher affinity for hydrogen sulfide than for carbon dioxide, removing from said system an off-gas enriched in hydrogen sulfide, and passing said off-gas to a sulfur recovery system comprising the conversion of sulfur values to elemental sulfur and the recovery of a tail gas containing hydrogen sulfide and sulfur dioxide, the
372
improvement which comprises hydrogenating said tail gas to convert sulfur dioxide to hvdrogen sulfide and recycling resultant hydroge&ed tail gas to said sour gas removal system, whereby essentially no hydrogen sulfide or sulfur dioxide is discharged into the environment.
4419239 APPARATUS FOR RECOVERING AND RECYCLING ANIMAL WASTE Gerald P Frank1
4421556 METHOD FOR DECONTAMINATION OF NICKEL-FLUORIDE-COATED NICKEL CONTAINING ACTINIDEMETAL FLUORIDES Norman F Windt, Joe L Williams assigned to The United States of America as represented by the United States Department of Energy
The invention is a process for decontaminating particulate nickel contaminated with actinidemetal fluorides. In one aspect, the invention nickel-fluoride-coated contacting comprises nickel with gaseous ammonia at a temperature effecting nickel-catalyzed dissociation thereof and effecting hydrogen-reduction of the nickel fluoride. The resulting nickel is heated to form a melt and a slag and to effect transfer of actinide metals from the melt into the slag. The melt and slag are then separated. In another aspect, nickel containing nickel oxide and actinide metals is contacted with ammonia at a temperature effecting nickel-catalyzed dissociation to effect conversion of the nickel oxide to the metal. The resulting nickel is then melted and separated as described. In another aspect nickel-fluorideactinide-metal containing nickel coated fluorides is contacted with both steam and ammonia. The resulting nickel then is melted and separated as described. The invention is characterized by higher nickel recovery, efficient use of ammonia, a substantial decrease in slag formation and fuming, and a valuable increase in the service life of the furnace liners used for melting.
A method and apparatus for recovering and recycling animal waste materials permits the separation of the solids with a desired moisture content from the remaining liquids and finer solid particles and wherein the liquids and finer solid particles are converted into a high quality single cell protein by means of aerobic digestion so as to maximize the value and percentage of total solids reclaimed as well as to maintain excellent sanitation and minimize odors from anaerobic decomposition. The animal waste material is delivered from the barn or other suitable collection area by aerated aerobic water onto an inclined separator screen, at which point the waste material is incrementally advanced along the screen by a combination of shuttledriven scraper blades and pressure pads so as to cause the excess moisture or liquid together with a minimal amount of the finer solids to pass through the separator screen while advancing the rest of the material off the end of the screen and from which it may be conveyed to a separate holding area. The separator mechanism of the present invention permits a larger percentage of the finer solid particles to attach to and remain with the larger solid particles which are recovered whereby to substantially increase the total digestible nutrient value of the solid waste material removed.
& Recycling,
Vol. 7, NOS. 2-4,
PP. 371-376,
1984.
Pergamon Press Ltd.
Printed in Oreat Britain.
NEW PATENTS This Section contains abstracts and where appropriate, illustrations of recently issued United States patents and published patent applications tiled from over 30 countries under the Patent Cooperation Treaty. This information was obtained from recent additions to the Pergamon PATSEARCH@ online database in accordance with interest profiles developed by the Editors. Further information about Pergamon PATSEARCH@ can be obtained from Pergamon International Information Corporation, 1340 Old Chain Bridge Road, McLean, Virginia 22101 U.S.A. Copies of complete patents announced in this Section are available from Pergamon International Information Corporation for@ per copy. Payment with order is required. Orders outside North America add $2 for air postage. Order by patent number from Pergamon International only.
4427376
4425317
APPARATUS FOR HEATING AGGREGATE, RECYCLED ASPHALT AND THE LIKE
RECYCLE OF HYDROGENATED SULFUR PLANT TAIL GAS TO SOUR GAS SCRUBBING SYSTEM
Robert E Etnyre, William H Wylie assigned to Wylie Manufacturing Company
Rainer Zeller, Aldo Belloni, Michae Heisel, Gruenwald, Federal Republic Of Germany assigned to Linde Aktiengesellschaft
A drum-type drier and/or mixer in which particulate material such as aggregate or recycled asphalt is introduced into the forward end of the drum. A burner at the rear end of the drum directs its flame forwardly through an elongated firing tube which extends from the rear end of the drum toward the forward end thereof. The hot gases discharged from the tube strike a baflle, are deflected into an annular chamber between the tube and the drum and then flow rearwardly through the chamber to an exhaust stack. The particulate material also is advanced rearwardly through the chamber and, during such advance, is heated (1) indirectly by the hot gases flowing forwardly through the firing tube and (2) directly by the hot gases deflected into and flowing rearwardly through the chamber.
In a process for the separation of at least carbon dioxide and hydrogen sulfide from a raw gaseous mixture to form a purified gaseous mixture comprising passing said gas through a sour gas removal system including the steps of scrubbing said gaseous mixture with a liquid scrubbing agent having a higher affinity for hydrogen sulfide than for carbon dioxide, removing from said system an off-gas enriched in hydrogen sulfide, and passing said off-gas to a sulfur recovery system comprising the conversion of sulfur values to elemental sulfur and the recovery of a tail gas containing hydrogen sulfide and sulfur dioxide, the
372
improvement which comprises hydrogenating said tail gas to convert sulfur dioxide to hvdrogen sulfide and recycling resultant hydroge&ed tail gas to said sour gas removal system, whereby essentially no hydrogen sulfide or sulfur dioxide is discharged into the environment.
4419239 APPARATUS FOR RECOVERING AND RECYCLING ANIMAL WASTE Gerald P Frank1
4421556 METHOD FOR DECONTAMINATION OF NICKEL-FLUORIDE-COATED NICKEL CONTAINING ACTINIDEMETAL FLUORIDES Norman F Windt, Joe L Williams assigned to The United States of America as represented by the United States Department of Energy
The invention is a process for decontaminating particulate nickel contaminated with actinidemetal fluorides. In one aspect, the invention nickel-fluoride-coated contacting comprises nickel with gaseous ammonia at a temperature effecting nickel-catalyzed dissociation thereof and effecting hydrogen-reduction of the nickel fluoride. The resulting nickel is heated to form a melt and a slag and to effect transfer of actinide metals from the melt into the slag. The melt and slag are then separated. In another aspect, nickel containing nickel oxide and actinide metals is contacted with ammonia at a temperature effecting nickel-catalyzed dissociation to effect conversion of the nickel oxide to the metal. The resulting nickel is then melted and separated as described. In another aspect nickel-fluorideactinide-metal containing nickel coated fluorides is contacted with both steam and ammonia. The resulting nickel then is melted and separated as described. The invention is characterized by higher nickel recovery, efficient use of ammonia, a substantial decrease in slag formation and fuming, and a valuable increase in the service life of the furnace liners used for melting.
A method and apparatus for recovering and recycling animal waste materials permits the separation of the solids with a desired moisture content from the remaining liquids and finer solid particles and wherein the liquids and finer solid particles are converted into a high quality single cell protein by means of aerobic digestion so as to maximize the value and percentage of total solids reclaimed as well as to maintain excellent sanitation and minimize odors from anaerobic decomposition. The animal waste material is delivered from the barn or other suitable collection area by aerated aerobic water onto an inclined separator screen, at which point the waste material is incrementally advanced along the screen by a combination of shuttledriven scraper blades and pressure pads so as to cause the excess moisture or liquid together with a minimal amount of the finer solids to pass through the separator screen while advancing the rest of the material off the end of the screen and from which it may be conveyed to a separate holding area. The separator mechanism of the present invention permits a larger percentage of the finer solid particles to attach to and remain with the larger solid particles which are recovered whereby to substantially increase the total digestible nutrient value of the solid waste material removed.