Hungarian journal of industrial chemistry, 1989
3. szám - Farag, A. S. et al.: Solvent Demetalization of Heavy Oil Residue
HUNGARIAN JOURNAL OF INDUSTRIAL CHEMISTRY VESZPRÉM Vol. 17. pp. 289-294 (1989) SOLVENT DEMETALIZATION OF HEAVY OIL RESIDUE A. S. Farag, O. I. Sif El-Din, M. H. Youssef, S. I. Hassan and S. Farmawy (Egyptian Petroleum Research Institute, Nasr City, Cairo, Egypt) Received: March 28, 1988 A description of the application of various precipitating solvents for the removal of heavy metals, particulary vanadium and nickal via the removal of asphaltene from atmospheric petroleum residue. The solvent deasphalting processes were carried out at ambient temperature. Hydrocarbons of relatively high molecular weight were tried together with some nonconventianol solvents. The precipitation variables were studied. The degree of refining was studied by evaluating the properties of the refined residue. Introduction There is a strong demand for economical conversion processes, which upgrade heavy hydrocarbons into more valuable light hydrocarbons. Hydrocracking processes are widely used for this purpose. But the high content of heteroatoms in the residue prevents an economical application of processes where catalysts are involved. Direct hydrodesulphurization of petroleum residues either atmospheric or vacuum, presents problems that are difficult to resolve due to the concentration in these fractions of impurities contained in the crude-asphaltenes (C7 insolubles); metals (Ni, V); and nitrogen compounds. These compounds can severely limit the performance of the catalysts used in the processes. The main objective of deasphalting is to produce deasphalted oil containing a minimum amount of asphaltenes and metals compatible with downstream processes. Various methods have been applied [1-4]. Meanwhile, crude quality has always been an important factor in considering coking for maximum diesel product. High metals and sulphur content crude could not be used economically because of the low value of the coke obtained. Thüs, treating the coker feedstock with solvent before coking, allows the production of high quality coke from virtually any feed. Besides, a very small