Analysis of the Advantages of Sulfuric Acid Production

Sulfuric acid production has certain advantages in terms of environmental protection, investment scale, and production operations compared with pyrite-based acid production.

In recent years, China's sulfuric acid production has developed rapidly. Its annual production ratio has rapidly increased from about 1.5% in 1959 to about 30% in 2010. Although the current rise in the price of sulphur raw materials seems to be a constraint on the development of sulphur-based sulphuric acid production, the proportion of sulphur-based sulphuric acid production will also increase substantially. Therefore, we need to study some characteristics of sulphur-burning sulphuric acid production. According to these characteristics and the specific requirements of enterprises, formulate economical, reasonable and reliable technical solutions to meet the rapid development of sulfuric acid production.

Compared with mineral acid and smelting flue gas acid, sulfuric acid production has many differences. In the sulphur-based sulphuric acid production process, the treatment of raw sulphur, the conversion of sulphur dioxide and the recovery of high and medium-temperature waste heat have generally attracted attention due to their differences; however, for the drying and absorption processes, due to the habits formed over the years Sexual thinking, its differences are often overlooked.

In fact, because the air in the drying tower of sulfuric acid production is air, rather than the high-humidity sulfur dioxide-containing gas, there is no water balance problem, and there is no sulfur dioxide dissolved in the circulating acid in the drying tower and desorbed in the absorption tower. The case, therefore, can use hydrazine (HZSO;) 98% acid drying air. From the phase equilibrium data of a HZo system, we can see that at the same temperature, the higher the concentration of sulfuric acid, the lower the equilibrium partial pressure of water vapor at the liquid level. When the second (H2504) reaches 98.3%, the liquid surface vapor fraction The pressure is the minimum. After this value is exceeded, there is almost no water vapor at the liquid surface, but the partial pressures of sulfur trioxide and sulfuric acid vapor increase, and acid mist is easily generated.

In addition, when the spray acid concentration increases, the absorption rate coefficient for water vapor increases, and at the same time the absorption driving force is increased due to the lower partial pressure of water vapor on the liquid surface. Therefore, from the point of view of absorption balance and absorption rate, the drying tower spray acid has the best (HZSO4) of about 89.3%.

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