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Making sulfuric acid by catalytic oxidation of sulfur dioxide gas and multistage absorption of wet conversion gas
Making sulfuric acid by catalytic oxidation of sulfur dioxide gas and multistage absorption of wet conversion gas
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机译:通过二氧化硫气体的催化氧化和湿法转化气的多级吸收制取硫酸
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摘要
An improved process for manufacture of sulfuric acid by catalytic oxidation 3 of wet sulfur dioxide gas. Wet conversion gas is contacted with sulfuric acid in a heat recovery stage 11 to effect absorption and generate the heat of absorption. Wet gas having a mole ratio of sulfur trioxide to water vapor of at least 0.95 is introduced into the heat recovery stage at a temperature above the dew point of the gas. Sulfuric acid is introduced into the heat recovery absorption stage at a temperature of at least about 17 DEG C and a concentration between about 98.5% and about 99.5%. The sulfuric acid stream as discharged from the absorption stage is at a temperature of at least about 190 DEG C and has a concentration between about 99% and about 100%. The heat of absorption is recovered from the discharge absorption acid stream in useful form by transfer of heat to another fluid in a heat exchanger 15, the another fluid being heated to a temperature of at least about 140 DEG C. The exit gas stream from the heat recovery stage is contacted with sulfuric acid in a condensing stage 23 for absorption of residual sulfur trioxide and condensation of sulfuric acid vapor. The liquid/gas contact in the condensing stage is carried out before the exit gas is either exhausted from the process or catalytically oxidized to produce additional sulfur trioxide. IMAGE
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