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Absorption towers H2SO4 production

A wet process where the gases are processed with all the water and steam. At the end of the process, the absorption tower is replaced by a condenser where the control of temperature allows the production of 96% H2SO4, most of the water being discharged to the atmosphere. [Pg.16]

Fig. 1.3. Top of H2S04-making ( absorption ) tower, courtesy Monsanto Enviro-Chem Systems, Inc. www.enviro-chem.com The tower is packed with ceramic saddles. 98.5 mass% H2SO4, 1.5 mass% H2O sulfuric acid is distributed uniformly across this packed bed. Distributor headers and downcomer pipes are shown. The acid flows through slots in the downcomers down across the bed (see buried downcomers below the right distributor). It descends around the saddles while S03-rich gas ascends, giving excellent gas-liquid contact. The result is efficient H2SO4 production by Reaction (1.2). A tower is 7 m diameter. Its packed bed is 4 m deep. About 25 m of acid descends per minute while 3000 Nm of gas ascends per minute. Fig. 1.3. Top of H2S04-making ( absorption ) tower, courtesy Monsanto Enviro-Chem Systems, Inc. www.enviro-chem.com The tower is packed with ceramic saddles. 98.5 mass% H2SO4, 1.5 mass% H2O sulfuric acid is distributed uniformly across this packed bed. Distributor headers and downcomer pipes are shown. The acid flows through slots in the downcomers down across the bed (see buried downcomers below the right distributor). It descends around the saddles while S03-rich gas ascends, giving excellent gas-liquid contact. The result is efficient H2SO4 production by Reaction (1.2). A tower is 7 m diameter. Its packed bed is 4 m deep. About 25 m of acid descends per minute while 3000 Nm of gas ascends per minute.
Figure 9.6 Double contact H2SO4 making flowsheet. The two absorption towers are notable. The left half of the flowsheet oxidizes most of the S02-in-feed-gas and makes the product SO3 into strengthened sulfiiric acid. It makes about 95% of the plant s new H2SO4. The right half of the flowsheet oxidizes almost all the remaining SO2 and makes its product SO3 into strengthened sulfuric acid. The final exit gas is very dilute in SO2 and SO3. Industrially, all the catalyst beds are in the same converter (Fig. 7.7). Table 23.2 gives industrial final H2SO4 making data. Figure 9.6 Double contact H2SO4 making flowsheet. The two absorption towers are notable. The left half of the flowsheet oxidizes most of the S02-in-feed-gas and makes the product SO3 into strengthened sulfiiric acid. It makes about 95% of the plant s new H2SO4. The right half of the flowsheet oxidizes almost all the remaining SO2 and makes its product SO3 into strengthened sulfuric acid. The final exit gas is very dilute in SO2 and SO3. Industrially, all the catalyst beds are in the same converter (Fig. 7.7). Table 23.2 gives industrial final H2SO4 making data.
Figure 23.1 Simplified single contact sulfuric acid production flowsheet. Its inputs are moist feed gas and water. Its outputs are 98 mass% H2SO4,2 mass% H2O sulfuric acid and dilute SO2, O2, N2 gas. The acid output combines gas dehydration ( drying ) tower acid, H2SO4 making ( absorption ) tower acid, and liquid water. The equivalent sulfur burning acid plant sends moist air (rather than moist feed gas) to dehydration. Appendix V gives an example sulfur burning calculation. Figure 23.1 Simplified single contact sulfuric acid production flowsheet. Its inputs are moist feed gas and water. Its outputs are 98 mass% H2SO4,2 mass% H2O sulfuric acid and dilute SO2, O2, N2 gas. The acid output combines gas dehydration ( drying ) tower acid, H2SO4 making ( absorption ) tower acid, and liquid water. The equivalent sulfur burning acid plant sends moist air (rather than moist feed gas) to dehydration. Appendix V gives an example sulfur burning calculation.
H2SO4 production (kg) increases linearly with increasing SO3 input mass (kg). This is because each kg mol of SO3 into the absorption tower produces a kg mol of H2SO4, i.e. ... [Pg.258]


See other pages where Absorption towers H2SO4 production is mentioned: [Pg.708]    [Pg.32]    [Pg.708]    [Pg.468]    [Pg.104]    [Pg.68]   
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