FCCU catalyst demetallization procedures reduce leachability, improve initial activity and increase hydrothermal stability for recycle to the FCCU
- Coastal Catalyst Technology, Inc., Houston, TX (United States)
Elemental analyses of spent Fluid Catalytic Cracking (FCCU) catalyst solids and leachates are necessary to characterize the total FCCU catalyst system including environmental considerations. Demetallization processing (DEMET) takes a portion of spent FCCU catalyst, removes a portion of metal contaminants by pyrometallurgical and hydrometallurgical procedures, to return to the FCCU. Fresh, spent, and demetallized spent FCCU catalysts were leached by various methods including the Toxicity Characteristic Leaching Procedure (TCLP). Compared to Land Disposal Restrictions - Phase II Universal Treatment Standards (UTS), demetallized catalyst TCLP leachates are below the UTS for all elements including vanadium. Following standard processing, alternative hydrometallurgical controls and procedures further enhance catalytic properties. Immediate activity improvement is seen in MATs prior to steaming. Improved resistance to steam deactivation, catalyzed by vanadium and other elements, is shown after spent and demetallized spent catalyst were steamed for 4/16 hours at 1450{degrees}F, and then ASTM microactivity (MAT) tested.
- OSTI ID:
- 370750
- Report Number(s):
- CONF-960376--
- Country of Publication:
- United States
- Language:
- English
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