초록 ▼

A process and system is disclosed for removing sulfur from tail-gas emitted from a Claus sulfur recovery process. First, the tail-gas is oxidized so as to convert sulfur therein to sulfur oxides. Oxidized tail-gas is directed into an absorber where a solid absorbent absorbs substantially all the sul

A process and system is disclosed for removing sulfur from tail-gas emitted from a Claus sulfur recovery process. First, the tail-gas is oxidized so as to convert sulfur therein to sulfur oxides. Oxidized tail-gas is directed into an absorber where a solid absorbent absorbs substantially all the sulfur oxides thereon. After allowing sufficient time for a desired amount of sulfur oxides to be absorbed, absorption is ceased. Next, the solid absorbent containing the absorbed sulfur oxides is contacted with a reducing gas so as to release an off gas containing hydrogen sulfide and sulfur dioxide. Upon releasing sulfur from the solid absorbent, the solid absorbent is regenerated and redirected into the absorber. Sulfur in the off gas emitted by regeneration is concentrated to an extent sufficient for use within a Claus sulfur recovery process for conversion to elemental sulfur. By combining this process with a Claus sulfur recovery process, sulfur dioxide emissions can be reduced to less than about two parts per million.

대표청구항 ▼

A process and system is disclosed for removing sulfur from tail-gas emitted from a Claus sulfur recovery process. First, the tail-gas is oxidized so as to convert sulfur therein to sulfur oxides. Oxidized tail-gas is directed into an absorber where a solid absorbent absorbs substantially all the sul

A process and system is disclosed for removing sulfur from tail-gas emitted from a Claus sulfur recovery process. First, the tail-gas is oxidized so as to convert sulfur therein to sulfur oxides. Oxidized tail-gas is directed into an absorber where a solid absorbent absorbs substantially all the sulfur oxides thereon. After allowing sufficient time for a desired amount of sulfur oxides to be absorbed, absorption is ceased. Next, the solid absorbent containing the absorbed sulfur oxides is contacted with a reducing gas so as to release an off gas containing hydrogen sulfide and sulfur dioxide. Upon releasing sulfur from the solid absorbent, the solid absorbent is regenerated and redirected into the absorber. Sulfur in the off gas emitted by regeneration is concentrated to an extent sufficient for use within a Claus sulfur recovery process for conversion to elemental sulfur. By combining this process with a Claus sulfur recovery process, sulfur dioxide emissions can be reduced to less than about two parts per million. 4, 19911000, Karimi et al., 264/171; US-5061777, 19911000, Yoda et al., 528/061; US-5077352, 19911200, Elton, 525/409; US-5084315, 19920100, Karimi et al.; US-5091205, 19920200, Fan; US-5100381, 19920300, Burns; US-5135516, 19920800, Sahatjian et al.; US-5160790, 19921100, Elton, 428/412; US-5179174, 19930100, Elton, 525/409; US-5229211, 19930700, Murayama et al.; US-5266359, 19931100, Spielvogel; US-5272012, 19931200, Opolski; US-5290585, 19940300, Elton, 427/002; US-5395666, 19950300, Brindle; US-5441488, 19950800, Shimura et al.; US-5452726, 19950900, Burmeister et al., 600/585; US-5490839, 19960200, Wang et al.; US-5503631, 19960400, Onishi et al.; US-5509899, 19960400, Fan et al.; US-5531715, 19960700, Engelson et al.; US-5576072, 19961100, Hostettler et al., 427/532; US-5656289, 19970800, Cho et al.; US-5662960, 19970900, Hostettler et al., 427/002.3; US-5670558, 19970900, Onishi et al.; US-5688855, 19971100, Stoy et al., 524/505; US-5693034, 19971200, Buscemi et al.; US-5746745, 19980500, Abele et al., 604/265; US-5749837, 19980500, Palermo et al.; US-5792415, 19980800, Hijlkema; US-5837313, 19981100, Ding et al.; US-5849209, 19981200, Kindt-Larsen et al.; US-5849368, 19981200, Hostettler et al., 427/536; US-5919570, 19990700, Hostettler et al., 428/423.1; US-6017577, 20000100, Hostettler et al., 427/002.12; US-6030656, 20000200, Hostettler et al., 427/002.3; US-6040058, 20000300, Hostettler et al., 428/457; US-6046143, 20000400, Khan et al., 508/208; US-6064900, 20000500, Vadgama et al., 600/345; US-6071266, 20000600, Kelley, 604/265; US-6080488, 20000600, Hostettler et al., 428/423.3; US-6120904, 20000900, Hostettler et al., 428/423.3; US-6176849, 20010100, Yang et al., 604/265