INTEGRATED SYSTEMS AND METHODS FOR SEPARATION AND EXTRACTION OF POLYNUCLEAR AROMATIC HYDROCARBONS HETEROCYCLIC COMPOUNDS AND ORGANOMETALLIC COMPOUNDS FROM HYDROCARBON FEEDSTOCKS

摘要

There is provided a process for extracting a heterocyclic compound, an organometallic compound, and a polynuclear aromatic hydrocarbon from a hydrocarbon feedstock such as crude oil or crude fraction. The heterocyclic compound and the organometallic compound are removed from the hydrocarbon feedstock through one or more successive extractions to form the first raffinate. The extraction uses a first solvent system containing an ionic liquid formed from carbon dioxide and water. Is removed from the first raffinate using a second solvent system containing the polynuclear aromatic hydrocarbon aprotic solvent such as NMP, DMSO, an aromatic compound, or a combination thereof. The extracted compound remains chemically intact and can be fractionated for further application. There is additionally provided a method for producing reduced levels of heterocyclic compounds, organometallic compounds, and hydrocarbon raffinates having 2-4 polycyclic aromatic hydrocarbons.