Process for purifying an aqueous, hydrogen sulfide-scrubbing solution
This patent describes a process for purifying an aqueous hydrogen sulfide-scrubbing solution containing a water-soluble vanadium component and a water-soluble organic compound, the scrubbing solution being capable of absorbing hydrogen sulfide and converting the hydrogen sulfide into elemental sulfur. The process comprises: forming a slurry by mixing the scrubbing solution with particles of a spent solid catalyst containing molybdenum and aluminum and a basic aqueous solution; contacting the slurry with an oxygen-containing gas under conditions such that the molybdenum in the catalyst is dissolved and oxidized to molybdate while the aluminum remains substantially in the form of a solid residue; separating the aqueous solution formed from the solid residue; contacting the aqueous solution with hydrogen sulfide under conditions such that the molybdenum in the solution is precipitated, thereby forming an aqueous solution having a reduced concentration of molybdenum; contacting the aqueous solution having a reduced concentration of molybdenum with a base under conditions such that the vanadium in the solution is precipitated, thereby forming an aqueous solution having a reduced concentration of vanadium and molybdenum; and recovering the aqueous solution having a reduced concentration of vanadium and molybdenum as wastewater.
- Assignee:
- Union Oil Co. of California, Los Angeles, CA
- Patent Number(s):
- US 4883601; A
- Application Number:
- PPN: US 7-238752A
- OSTI ID:
- 7054616
- Resource Relation:
- Patent File Date: 30 Aug 1988
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
FLUE GAS
SCRUBBING
PROCESS SOLUTIONS
PURIFICATION
ALUMINIUM
AQUEOUS SOLUTIONS
CATALYSTS
HYDROGEN SULFIDES
MOLYBDENUM
CHALCOGENIDES
DISPERSIONS
ELEMENTS
GASEOUS WASTES
HYDROGEN COMPOUNDS
METALS
MIXTURES
SOLUTIONS
SULFIDES
SULFUR COMPOUNDS
TRANSITION ELEMENTS
WASTES
010402* - Coal
Lignite
& Peat- Purification & Upgrading