Removal of hydrogen sulfide from fluid streams with minimum production of solids
A continuous process is described for removing hydrogen sulfide from a fluid stream, comprising: incinerating hydrogen sulfide to form sulfur dioxide; selectively absorbing the sulfur dioxide in an alkaline aqueous solution without substantial carbon dioxide absorption to form a solution of sulfites essentially free of insoluble carbonates; contacting the fluid stream in a first reaction zone with an aqueous solution at a pH range suitable for hydrogen sulfide removal wherein the solution contains an effective amount of polyvalent metal chelate to convert the hydrogen sulfide to sulfur and to reduce the polyvalent metal chelate to a lower oxidation state; contacting the sulfur with the sulfites to form sulfur compounds; contacting the reduced polyvalent metal chelate in a second reaction zone with oxygen to reoxidize the polyvalent metal chelate; and recirculating the reoxidized polyvalent metal chelate back to the fluid stream/aqueous chelate solution contacting step.
- Assignee:
- Dow Chemical Co., Midland, MI
- Patent Number(s):
- US 4830838
- OSTI ID:
- 5617812
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
320305* -- Energy Conservation
Consumption
& Utilization-- Industrial & Agricultural Processes-- Industrial Waste Management
500200 -- Environment
Atmospheric-- Chemicals Monitoring & Transport-- (-1989)
54 ENVIRONMENTAL SCIENCES
ABSORPTION
AQUEOUS SOLUTIONS
CHALCOGENIDES
CHELATING AGENTS
CHEMICAL REACTIONS
COMBUSTION
DESULFURIZATION
DISPERSIONS
GASEOUS WASTES
HYDROGEN COMPOUNDS
HYDROGEN SULFIDES
MIXTURES
OXIDATION
OXIDES
OXYGEN COMPOUNDS
REMOVAL
SOLUTIONS
SULFIDES
SULFUR COMPOUNDS
SULFUR DIOXIDE
SULFUR OXIDES
THERMOCHEMICAL PROCESSES
WASTES