Loading patent…
AssigneeInstituto Mexicano Del Petroleo
InventorsRafael Martinez Palou, Natalya Victorovna Likhanova, Eugenio Alejandro Flores Oropeza, Diego Javier Guzman Lucero
Estimating the term…
Ionic liquids of the general formula C+A− where C+ represents an organic cation, specifically, but not limited to the imidazolium, pyridinium, isoquinolinium, ammonium types, which have aliphatic and aromatic substituents, while A− represents a carboxylate, aromatic and aliphatic anion. The ionic liquids are synthesized under conventional heating or microwave irradiation This invention is also related to the application of ionic liquids to remove sulfur compounds of naphthas through a liquid-liquid extraction and the recovery and reuse of ionic liquids by the application of heat, reduced pressure and washing with solvents.
A process for the desulfurization of a hydrocarbon feedstock containing sulfur compounds, which comprises contacting said feedstock with a halogen-free sulfur extracting liquid consisting essentially of an ionic liquid containing a heterocyclic cation and a carboxylate anion and having the formula C+A− wherein
A process for the desulfurization of a hydrocarbon feedstock containing sulfur compounds comprising the step of contacting said feedstock with a halogen-free sulfur extracting liquid consisting essentially of an ionic liquid containing a heterocyclic cation and a carboxylate anion, wherein said heterocyclic cation is an isoquinolinium cation and its derivatives with substituents comprising benzylic, aromatic, cycloalkyl, alkenylic or aliphatic chains, which contain from 1 to 10 carbon atoms.
A process for the recovery and reuse of ionic liquid used for the removal of sulfur impurities from hydrocarbons, said ionic liquid is halogen free comprising an isoquinolinium cation and a carboxylate anion, and containing sulfur compounds, which comprises passing said ionic liquid containing sulfur compounds in a first stage in which the ionic liquid is heated to a temperature in the range of 60 to 90° C., under conditions of reduced pressure in the range of 130 to 150 mm Hg and removing volatile compounds, passing the resulting ionic liquid to a second stage in which the ionic liquid is washed with a solvent selected from the group consisting of diethyl ether, hexanes, heptanes, petroleum ether and mixtures thereof in a proportion v/v of 1 to 15 and removing the sulfur compounds from the ionic liquid, and passing the solvent washed ionic liquid to a third stage in which the solvent is removed under vacuum conditions.
Dependencies are inferred from the claim text.