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Abstract
A microwave applicator is proposed for both batch and continuous-flow in-situ oxidation of elemental sulphur to sulphuric acid in the aqueous phase. Both double-slot magnetic field coupling and electric field coupling is used to excite the TM01 mode in the cylindrical applicator while the dominant TE mode is suppressed. A dual feed excitation system which utilises a short-slot top-wall coupler provides uniform heating and continuous source protection. Experimental results made on an X-band model are described.