Study of the possible removal of metals (Fe, Ni, V, Ca and Na) contaminating FCC catalyst in crude oil desalting process
Abstract
Crude oil contains trace amounts of vanadium, iron, calcium and nickel (V, Fe, Ca and Ni), usually in oil-soluble form. These metals agglomerate in the residual fuel oil fractions, which are feedstock for the RFCC unit. During the cracking process, the metals accumulate on the FCC catalyst, decreasing the catalytic activity and changing the physicochemical properties of fuels. This paper illustrates the performance of the removal of Fe, Ni, Ca and V from crude oil by extraction method with organic diacid system and hydroxyl acid. The results obtained from atomic absorption spectroscopy (AAS) show that the mixture of lactic acid, oxalic acid and citric acid has good performance in removing contaminated metals, with 3.91ppm of Fe, 6.42ppm of Ni, 23.85ppm of Ca and 25.87ppm of Na being removed. In addition, the results from the inductively coupled plasma method (ICP) reveal that the removal of Ni, V, Fe, Ca and Na were 46%, 51%, 66%, 85% and 78% respectively.
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