Abstract: Method for the automated production of liquid SO2 having a purity above 99.9% from elemental sulfur and pure oxygen, in the presence of SO2 recirculated from the closed circuit production system itself. The temperature of the sulfur is controlled by means of pre-defined S, O2 and SO2 ratios. The automation is made based on oxygen sensors and on sulfur and SO2 flow meters with their respective control connections and proportional valves permitting a fine control of the sulfur combustion reaction. The liquefaction of the gaseous SO2 produced is carried out alternatively by a cool plant working between −10 and −60° C. or with a compression unit working at a pressure between 3.8 and 5.0 bar. The automation permits an optimum temperature control and a clean production of SO2.