MUMBAI, India, July 7 -- Intellectual Property India has published a patent application (202527103409 A) filed by Sumitomo Osaka Cement Co. ,Ltd. on October 27, 2025, for Method For Producing Ammonium Nitrate Using Nitrogen Dioxide In Cement Exhaust Gas.
Inventor includes Sasaki Shohei.
The application for the patent was published on July 03, 2026, under issue no. 27/2026.
Abstract: A method for producing ammonium nitrate comprises: a nitrogen dioxide recovery step in which nitrogen dioxide in a cement exhaust gas is brought into contact with water to produce an NOx-containing solution; a reduction reaction step in which a reductive catalyst is brought into contact with the NOx-containing solution to produce ammonia; an ammonia recovery step in which ammonia is vaporized with a waste heat gas; a solid-liquid separation step in which a remaining material obtained after the recovery of ammonia is subjected to solid-liquid separation to separate iron hydroxide from NOx in the unused remaining portion; a neutralization step in which a nitrate nitrogen-/nitrite nitrogen-containing solution that has been separated in the preceding step and the NOx-containing solution are brought into contact with the vaporized and recovered ammonia to prepare ammonium nitrate; and a catalyst production step in which magnetite to be used in the reduction reaction step is produced by reacting iron sulfate with an aqueous sodium hydroxide solution and then subjecting a resultant product to solid-liquid separation, the aqueous sodium sulfate solution in the solid- liquid separation is separated into sodium hydroxide and sulfuric acid by electrodialysis, and the sodium hydroxide is used in a circulatory manner in the preparation of the magnetite. By employing this method, nitrogen dioxide in a cement exhaust gas is treated easily and highly efficiently and environmental load is reduced.
Disclaimer: Curated by HT Syndication.
