MUMBAI, India, June 27 -- Intellectual Property India has published a patent application (202517053830 A) filed by Dow Technology Investments Llc, Midland, U.S.A., on June 3, for 'process of controlling heavies in a recycle catalyst stream.'

Inventor(s) include Baser, Deven Swapneshu; Liu, Yujun; and Miller, Glenn A.

The application for the patent was published on June 27, under issue no. 26/2025.

According to the abstract released by the Intellectual Property India: "A process of controlling heavies in a recycle catalyst stream, particularly, for use in a continuous hydroformylation process of converting an olefin with synthesis gas in the presence of a hydroformylation catalyst to form an aldehyde product stream with subsequent separation of the catalyst for recycle to the hydroformylation step. The process involves removing a crude product stream from a hydroformylation reaction zone comprising one or more aldehyde products, one or more heavies by-products, a transition metal-organophosphorous ligand complex catalyst, one or more unconverted reactants, and one or more inert lights; providing a water stream; combining the water stream with the crude product stream into an azeotropic vaporizer; removing from the vaporizer an overhead gas stream comprising one or more aldehyde products, one or more unconverted reactants, one or more inert lights, a portion of the water, and a portion of the heavies by-products, and feeding said overhead gas stream into a condenser; removing from the condenser an overhead gas stream comprising one or more unconverted reactants, a portion of the added water, and one or more inert lights; removing as a tails stream from the azeotropic vaporizer, a liquid recycle catalyst stream comprising the transition metal-organophosphorous ligand complex catalyst, the balance of the aldehyde product and the balance of the heavies by-products to be sent to the reaction zone wherein at least 25% of the aldehyde product recovered in overhead gas stream from the condenser is removed as a water azeotrope."

The patent application was internationally filed on Nov. 15, 2023, under International application No.PCT/US2023/079790.

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