METHOD OF OBTAINING SULPHURIC ACID BY MEANS OF HYDROGEN SULPHIDE Russian patent published in 2015 - IPC C01B17/74 

FIELD: chemistry.

SUBSTANCE: method includes the following stages: (1) carrying out redox reaction between initial gaseous H₂S and oxygen, contained in oxygen-enriched air to obtain SO₂, with control of residual oxygen after stage of redox reaction in molar concentration ≥2%; (2) cooling product, obtained at stage (1) to temperature 390-430°C, with further realisation of reaction of catalytic oxidation with oxygen. Reaction of catalytic oxidation is realised step-by-step, until degree of SO₂ conversion constitutes ≥98.7% or until SO₂% concentration at output constitutes 550 mg/m³ under normal conditions; and (3) cooling product, obtained at stage (2), to temperature ≥10°C higher than temperature of H₂SO₄ vapour condensation point, with further cooling to temperature 60-120°C, collection of obtained H₂SO₄ and realisation of coalescing separation of gas, obtained after cooling, immediately before its release into atmosphere.

EFFECT: invention makes it possible to provide high efficiency of hydrogen sulphide removal.

10 cl, 7 dwg