METHOD OF CONTINUOUS AMMONIUM THIOSULPHATE PRODUCTION Russian patent published in 2008 - IPC C01B17/64 

FIELD: chemistry.

SUBSTANCE: method includes stages: (a) partial condensation in partial condenser 4 of first gaseous or partly liquid raw material flow, including H₂O, H₂S and NH₃, with mole ratio H₂S:NH₃ less than 0.4; (b) passing water condensate, which includes NH₄HS and NH₃, from partial condenser 4 into reactor 9, in which said condensate is subjected to contact with third raw material gas flow 7, which includes H₂S and with water solution 10, which includes NH₄HSO₃ and (NH₄)₂SO₃, with formation of water solution (NH₄)₂S₂O₃; (c) passing gas flow, which includes NH₃ and H₂S, from partial condenser 4 to mixer 13, in which said gas flow is fully dissolved in water, flowing out of aerosol filter 25; d) passing second raw material gas flow, which includes approximately 2/3 mole of SO₂ per NH₃, contained in first raw material flow, into absorber 21 and aerosol filter 25; (e) passing water solution, obtained in mixer 13, into SO₂-absorber 21; (f) passing waste gas from absorber 21 to aerosol filter 25, calculated by chemical equation of water amount necessary to obtain approximately 40-65% wt (NH₄)₂S₂O₃ in water solution of (NH₄)₂S₂O₃, removed from reactor 9. Invention allows to covert 99.9% of all sulfur and all ammonium in raw material flows into (NH₄)₂S₂O₃.

EFFECT: increase of product output.

10 cl, 2 dwg