MUMBAI, India, July 5 -- Intellectual Property India has published a patent application (202517050275 A) filed by Uop Llc, Des Plaines, U.S.A., on May 26, for 'improving aromatics extraction through integration of complementary co-solvents.'
Inventor(s) include Shih, Raymond; Bhattacharyya, Souryadeep; Xu, Lijun; Attarde, Dinesh; and Vishnoi, Ankit.
The application for the patent was published on July 4, under issue no. 27/2025.
According to the abstract released by the Intellectual Property India: "Solvent mixtures for extractive distillation are described. One solvent mixture consists essentially of: a first solvent having a higher octane-to-benzene relative volatility than sulfolane in a 90 % benzene 10 % octane feed mixture at 150 C and 24: l solvent-to-feed weight ratio; a second solvent having a higher octane-to-benzene relative volatility than sulfolane in a 50 % benzene 50 % octane feed mixture at 150 C and 3: 1 solvent-to-feed weight ratio; and optionally an additive; wherein the solvent mixture has a higher octane-to-benzene relative volatility than Sulfolane in a combined benzene and octane feed at 125 C and 3: 1 solvent-to-feed weight ratio wherein a benzene weight ratio is higher than 30%. Another solvent mixture consists essentially of: a base solvent selected from the group consisting of sulfolane, N-methyl-pyrrolidone (NMP), N-formylmorpholine (NFM), dimethylformamide (DMF), glycol derivatives, or combinations there along with first and second co-solvents. Methods of extractive distillation are also described."
The patent application was internationally filed on Dec. 20, 2023, under International application No.PCT/US2023/084984.
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