Utilization Of Waste Spent Hydroprocessing
Catalyst: Development Of A Process For Full
Recovery Of Deposited Metals And Alumina
Support
Author(s)
M. Marafi, M. S. Rana, R. Navvamani & H. Al-Sheeha
Abstract
An emphasis has been placed on investigation spent hydroprocessing catalyst
recovery due to environmental regulations which register spent catalysts as
hazardous waste materials. Kuwait refinery produces ca. 6000 ton/year spent
catalysts from the bottom of the barrel (ARDS) processes, which contain
valuable metals such as molybdenum, vanadium, nickel or cobalt etc. These
catalysts are not viable to regenerate mainly due to the metal deposition. The
present study is carried out on industrial spent residue hydroprocessing (ARDS)
catalysts that contain high levels of metals. The possibility of recycling total
spent catalysts (TSC) was studied by using various steps such as deoiling,
drying, grinding, sieving and decoking. In the subsequent steps, the digested
spent catalysts were treated with acid-base reactions in order to separate the
various components of the spent catalyst. Using various leaching reaction
conditions such as acid-base concentration, reaction pH in aqueous as well as
organic mediums were studied. The metals were leached out in the solution
while alumina support was recovered as bulk solid in the form of boehmite. The
recovered alumina is further treated hydrothermally and recovered as boehmite,
samples were characterized by surface area, pore volume, and pore size
distribution measurements. Hence, recovery of valuable metals from the spent
catalysts is an attractive option for their recycling and utilization. Therefore, TSC
recovery is not only important from an environmental point of view but also very
vital from an economic viewpoint.
Keywords: spent catalyst, recycling, hazardous waste, residue hydroprocessing,
waste utilization.
Keywords
spent catalyst, recycling, hazardous waste, residue hydroprocessing,waste utilization.
Related Book
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