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Application of sodium hydroxide alkali process in the treatment of sulphuric acid tail gas

WANG Guocai;Sinopec Jingmen branch;  
The sodium hydroxide alkali washing desulphurization process and operation situation of Jingmen Petrochemical 65 kt/a dry sulphuric acid plant with hydrogen sulfide are introduced. The p H value of circulating alkali solution 6-7,w( Na OH) 30% sodium hydroxide solution supplementation is 1 t/h and the discharge density of waste water is 950 kg/m~3.After more than 5 months of operation,the desulphurization system is running well,efflux exhaust ρ( SO_2) continued under the control of 200 mg/m~3 and acid mist concentration control below 20 mg/m~3.
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