METHOD OF PRODUCING SULPHUR FROM SULPHUR DIOXIDE Russian patent published in 2011 - IPC C01B17/04 

FIELD: chemistry.

SUBSTANCE: elementary sulphur is heated and brought into contact with a reducing agent in a heater to obtain an output stream of reducing gas containing hydrogen sulphide. The reducing gas is brought into contact with a stream which contains sulphur dioxide to form a stream of a feeding gas mixture. The stream of feeding gas mixture is brought into contact with an activated catalyst for reaction of hydrogen sulphide with sulphur dioxide to form a gas stream containing elementary sulphur and water. Elementary sulphur from said gas stream is regenerated. The method of converting sulphur dioxide involves feeding a reducing agent into a heater. Elementary sulphur is also fed into the heater and heated to temperature between approximately 500°C and approximately 650°C. The reducing agent and elementary sulphur are brought into contact in a first reactor to form an output stream of gaseous reducing agent containing H₂S, COS or CS₂. The gaseous reducing agent is brought into contact with an output stream containing sulphur dioxide in a second reactor to form a stream of gaseous product containing elementary sulphur. The gaseous product is cooled for condensation and regeneration of elementary sulphur.

EFFECT: low fuel consumption, improved quality of sulphur.

39 cl, 3 dwg