What impact does excessively high acid temperature have on equipment and facilities?

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At room temperature, concentrated sulfuric acid does not have a strong corrosive effect on equipment, as the metal surface forms a chemically stable \"passivation layer\" under the action of this acid, which separates the inner layer of metal in the equipment from the concentrated sulfuric acid. However, as the temperature of the sulfuric acid increases, it becomes increasingly difficult to form a passivation film on the surface of the equipment. A continuous increase in sulfuric acid temperature can destroy the structure of the passivation film on the metal surface. Therefore, under the same sulfuric acid concentration, the higher the acid temperature, the stronger the corrosiveness of the sulfuric acid. When the temperature of the acid in the dry absorption cycle exceeds a certain level, the corrosive strength of concentrated sulfuric acid increases, making it difficult for a passivation film to form on the metal layers of the equipment, which leads to corrosion and damage of the equipment. Therefore, in actual production, the temperature of dry acid absorption should be kept within the specified range as much as possible. Source: \"Modern Guidelines for Sulfuric Acid Production Operations and Technology\"