CONVERSION OF ACID GAS TO SULPHATE OR PHOSPHATE-BASED FERTILIZERS

摘要

A method is disclosed for producing sulphate or phosphate-based fertilizer from an acid gas stream. The method involves feeding the acid gas stream, containing at least 50% by volume hydrogen sulphide, and air to a furnace, where it is burned to produce a sulphur dioxide rich gas stream. The sulphur dioxide rich gas stream is then fed to a reactor to produce a sulphuric acid stream and a waste stream comprising carbon dioxide, nitrogen, oxygen, trace impurities and trace amounts of unreacted sulphur dioxide. The sulphuric acid stream is finally converted to a sulphate or phosphate-based fertilizer.