Fecha de publicación: 12/01/2023 Fuente: Wipo Milk or dairy products The present application provides a method for treating tail gas. The tail gas is produced during the process of sucrose-6-ester being chlorinated to produce sucralose-6-ester. The method comprises: cooling and condensing tail gas so as to remove a portion of organic solvents and water to obtain a first solution and first tail gas; adsorbing and separating the first tail gas by using a hydrophilic ionic liquid so as to remove most of the water and organic solvents therein to obtain second tail gas; adsorbing and filtering the second tail gas by using a solid adsorbent to obtain a gaseous mixture, and separating the gaseous mixture to obtain gaseous hydrogen chloride and liquid sulfur dioxide; and introducing the gaseous hydrogen chloride into water to obtain hydrochloric acid. In the present application, by primarily using ionic liquid adsorption for organic binding with condensation, rectification and other means, the chlorinated tail gas during the sucralose production process may be effectively treated, HCl and SO2 are effectively separated to obtain high-quality hydrochloric acid and liquid SO2 products, the process is simple process, and the costs are low.