Process for the purification of exhaust gases

Details Process for the purification of exhaust gases Process for the purification of exhaust gases

B - Operations, Transporting

01

D

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B01D 53/14 (2006.01) B01D 53/50 (2006.01) B01D 53/68 (2006.01) C01B 17/60 (2006.01) C01B 17/74 (2006.01)

Patent

CA 1323175

Process for the Purification of Exhaust Gases ABSTRACT OF THE DISCLOSURE A process for the purification of hot exhaust gases containing dust, sulphur dioxide and/or hydrogen chlrodie and/or hydrogen fluoride and having a water vapor partial pressure of at least 15 volumes %, wherein a) the hot exhaust gases are cooled to temperatures below 135°C by scrubbing with 60 - 75% sulphuric acid, b) the exhaust gases from a) are cooled to 60 - 80°C by contact with 5 - 20% sulphuric acid, e) the exhaust gases from b) are desulphurized in contact with moist active charcoal to form sulphuric acid, d) the sulphuric acid formed in c) is raised to a concentration of 5 to 20% H2SO4 in contact with the exhaust gases, e) the 5 to 20% sulphuric acid formed in d) is evaporated to a concentration of 60 to 80% H2SO4 by the heat obtained from cooling the exhaust gases of a) and f) prior to stage e) HCl and/or HF is removed from a mixture of 5 to 20% H2SO4 from d) with 60 to 80% sulphuric acid. Le A 24 684

545731

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