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Class Information
Number: 423/578.1
Name: Chemistry of inorganic compounds > Sulfur or compound thereof > Elemental sulfur > Purifying crude sulfur
Description: Products or processes including recovering or separating sulfur from impurities mixed therewith.










Sub-classes under this class:

Class Number Class Name Patents
423/578.2 From ore 23


Patents under this class:
1 2

Patent Number Title Of Patent Date Issued
8702842 Method for removing sulfur from a gas stream Apr. 22, 2014
8679448 Configurations and methods of treatment of sulfur-containing vent gases Mar. 25, 2014
8663596 Reactor, a structure packing, and a method for improving oxidation of hydrogen sulfide or polysulfides in liquid sulfur Mar. 4, 2014
8597581 System for maintaining flame stability and temperature in a Claus thermal reactor Dec. 3, 2013
8425783 System and method that removes contaminants from sulfur Apr. 23, 2013
8361432 Reactor, a retained catalyst structure, and a method for improving decomposition of polysulfides and removal of hydrogen sulfide in liquid sulfur Jan. 29, 2013
8084013 Method and apparatus for degasification of claus-derived sulfur Dec. 27, 2011
8075866 Sulfur degassing process Dec. 13, 2011
7998451 Sulfur degassing process Aug. 16, 2011
7927577 Sulfur collection systems and processes with integrated degassing Apr. 19, 2011
7918994 System that removes contaminants from sulfur Apr. 5, 2011
7837971 Sulfur refining process Nov. 23, 2010
7294327 Multi-stage cryogenic acid gas removal Nov. 13, 2007
7266173 Method for distillation of sulfur for the preparing radioactive phosphorous nuclide Sep. 4, 2007
7081233 Method and apparatus for degassing liquid sulfur Jul. 25, 2006
6887447 Hydrogen sulfide abatement in molten sulfur May. 3, 2005
6706250 Process for the purification of sulfur Mar. 16, 2004
6696037 Method of recovering sulfur from minerals and other sulfur-containing compounds Feb. 24, 2004
6676918 Hydrogen sulfide removal from liquid sulfur Jan. 13, 2004
6656445 Hydrogen sulfide abatement in molten sulfur Dec. 2, 2003
6569398 Method for treating hydrogen sulfide-containing waste gases May. 27, 2003
6495117 Process for recovering sulfur from H2S-bearing gas Dec. 17, 2002
6334991 Purification of sulfur by means of centrifugation Jan. 1, 2002
6149887 Method and apparatus for degassing sulfur Nov. 21, 2000
6010677 Method and apparatus for degassing sulphur Jan. 4, 2000
5935548 Method for removing hydrogen sulfide from molten sulfur Aug. 10, 1999
5928617 Process for removal of mercury contamination Jul. 27, 1999
5861099 Process for the filtration of suspensions containing sulfur Jan. 19, 1999
5824282 Method of sulfur purification Oct. 20, 1998
5733516 Process for removal of hydrogen sulfide from a gas stream Mar. 31, 1998
5711929 Purification of elemental sulphur Jan. 27, 1998
5686057 Selective oxidation of hydrogen sulfide in molten sulfur Nov. 11, 1997
5656251 Method of sulfur purification Aug. 12, 1997
5651896 Sulfur separation system with interface control Jul. 29, 1997
5632967 Process for the high pressure degassing of hydrogen sulfide from liquid sulfur May. 27, 1997
5630931 Process for the hydrometallurgical and electrochemical treatment of the active mass of exhausted lead batteries, to obtain electrolytic lead and elemental sulphur May. 20, 1997
5403571 Purification of elemental sulphur Apr. 4, 1995
5378448 Process for removing selenium from sulfur Jan. 3, 1995
5340383 Reduction of particulate sulfur emissions from liquid sulfur storage tanks Aug. 23, 1994
5316751 Methods for mine tailing clean-up using recovery technologies May. 31, 1994
5049370 Process and apparatus for purifying elemental sulfur carried in an aqueous cake Sep. 17, 1991
5030438 Catalytic removal of hydrogen sulfides from liquid sulfur Jul. 9, 1991
5004591 Catalytic process for removal of hydrogen sulfides from liquid sulfur Apr. 2, 1991
4897251 Catalytic removal of hydrogen sulphide from liquid sulphur Jan. 30, 1990
4876079 Separation of a mixture of sulfur and alkaline solution and apparatus therefor Oct. 24, 1989
4871447 Recovery of elemental sulphur from products containing contaminated elemental sulphur by froth flotation Oct. 3, 1989
4849204 Catalytic removal of hydrogen sulfides from liquid sulfur Jul. 18, 1989
4844720 Process for removal of hydrogen sulfide and hydrogen polysulfide from liquid sulfur Jul. 4, 1989
4824656 Method of recovering sulfur from solid catalysts Apr. 25, 1989
4801443 Sulphur recovery process Jan. 31, 1989

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