Process for removal of nitrogen and poly-nuclear aromatics from hydrocracker feedstocks
AssigneeSaudi Arabian Oil Company
InventorOmer Refa Koseoglu
Life of this patent
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Abstract
A feedstream to a hydrocracking unit is treated to remove or reduce the content of polynuclear aromatics and nitrogen-containing compounds by contacting the feedstream with an adsorbent compound selected from attapulgus clay, alumina, silica gel and activated carbon in a fixed bed or slurry column and separating the treated feedstream that is lower in the undesired compounds from the adsorbent material. The adsorbent can be mixed with a solvent for the undesired compounds and stripped for re-use.
Claims9
An improved hydrocracking process comprising a process for treating a feedstream to a hydrocracking unit that includes nitrogen-containing compounds and PNA compounds, the feedstream selected from the group consisting of de-metalized oil, deasphalted oil, coker gas oils, visbroken gas oils, fluid catalytic cracking heavy oils and mixtures thereof, the process comprising the steps of:
- (a) introducing the feedstream into the inlet port of at least one adsorption column that is upstream of a hydrocracking unit, the feedstream containing an adsorbent material selected from the group consisting of attapulgus clay, alumina, silica gel and activated carbon;
- (b) maintaining the feedstream in contact with the adsorbent material to adsorb the nitrogen-containing and PNA on the adsorbent material, while maintaining the at least one adsorption column at a pressure in the range of 1-30 from Kg/cm2 and a temperature in the range of 20 to 250° C.;
- (c) continuously withdrawing treated feedstream from the at least one adsorption column;
- (d) directing the treated feedstream to an inlet of the hydrocracking unit;
- (e) desorbing the adsorbed nitrogen-containing and PNA compounds to regenerate the adsorbent material;
- and
- (f) reusing the regenerated adsorbent material in steps (a)-(e), above.
A hydrocracking process comprising:
- (a) passing feedstream containing hydrocarbons boiling above 370° C. through a first treatment zone that is upstream of a hydrocracking reaction zone and maintained at a temperature in the range of from about 20° C. to 250° C. and a pressure in the range of from 1 KG/cm2 to 30 Kg/cm2;
- (b) contacting the hydrocarbon feedstream with an adsorbent material in the first treatment zone;
- (c) adsorbing nitrogen-containing and PNA compounds on the adsorbent material in the first treatment zone;
- (d) withdrawing a treated hydrocarbon feedstream effluent from the first treatment zone;
- and
- (e) passing the treated hydrocarbon feedstream effluent into the hydrocracking reaction zone that is maintained at hydrocracking pressure and temperature conditions.
Dependencies are inferred from the claim text.