MUMBAI, India, Sept. 7 -- Intellectual Property India has published a patent application (202617084360 A) filed by Metso Metals Oy on July 09, 2026, for Process And Plant For Producing Sulfuric Acid.
Inventors include Kazdal, Timur; Mohsler, Stefan; and Bruner, Stefan.
The application for the patent was published on September 04, 2026, under issue no. 36/2026.
Abstract: The invention is directed to a process to produce sulfuric acid and a plant for carrying out this process. At least one source is producing a sulfur dioxide-containing gas in an amount a, such that at least a part of the sulfur dioxide-containing gas and added oxygen are introduced as a feed gas into a pre-conversion stage to produce a sulfur trioxide-containing gas stream. The amount of inert gas added together with the oxygen is between 0 and 78 vol.-%. A partial stream of the sulfur trioxide- containing gas stream is branched off and is recycled directly into the pre- conversion stage or into the feed gas of the pre-conversion stage. The remaining sulfur dioxide-containing gas is passed through a conventional sulfuric acid plant, which comprises at least one contact stage arranged in a main converter to react sulfur dioxide with oxygen to produce sulfur trioxide. Therein, the generated sulfur trioxide-containing gas is fed to at least one absorber, where the produced sulfur trioxide is absorbed with sulfuric acid as absorption medium to form sulfuric acid. The conventional sulfuric acid plant has a capacity to convert an amount of sulfur dioxide below the amount a.
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