Method and apparatus for removal of H[sub 2]S from a process gas, including thiosulfate and/or cyanide salt decomposition

Patent · Tue Jun 01 04:00:00 EDT 1993

OSTI ID:6511809

McManus, D

A method of removing H[sub 2]S from a process gas is described including the steps of: intimately contacting the process gas with an aqueous catalytic polyvalent metal redox solution to absorb the H[sub 2]S into the polyvalent metal redox solution, and to form a reduced catalytic polyvalent metal redox solution; oxidizing the reduced catalytic polyvalent metal redox solution sufficiently to regenerate the catalytic polyvalent metal redox solution such that it is capable of absorbing H[sub 2]S from said process gas; and anaerobically treating a portion of the aqueous polyvalent metal redox solution, said solution containing a thiosulfate salt, after absorption of H[sub 2]S, at a temperature in the range of about 400 F to about 700 F and a pressure of at least about 1,000 psig, without the addition of hydrogen, for a time sufficient to decompose thiosulfate salts present in the polyvalent metal redox solution.

• Assignee: ARI Technologies Inc., Palatine, IL (United States)
• Patent Number(s): A; US 5215728
• Application Number: PPN: US 7-630823
• OSTI ID: 6511809
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
010402 -- Coal
Lignite
& Peat-- Purification & Upgrading
02 PETROLEUM
020400* -- Petroleum-- Processing
ADSORPTION
CATALYSTS
CHALCOGENIDES
CHEMICAL REACTIONS
CYANIDES
DESULFURIZATION
ELEMENTS
FLUIDS
GASES
HYDROGEN COMPOUNDS
HYDROGEN SULFIDES
METALS
REDOX REACTIONS
REGENERATION
REMOVAL
SORPTION
SULFIDES
SULFUR COMPOUNDS
THIOSULFATES