On the concentration of the acid produced by the wet acid production method as well
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It is difficult to achieve a concentration of 98% in the acid produced by the wet process, whereas the standard requirement for concentrated sulfuric acid specifies a concentration of 98%. Currently, many wet acid production plants are trying to increase the concentration of the finished acid produced by their wet acid production units. One of the measures taken is to raise the temperature at the outlet of the condenser, but this imposes higher requirements on the quality of the condenser. Meanwhile, increasing the condenser outlet temperature also reduces the \"absorption rate\" of SO3 and sulfuric acid vapor in the condenser. On the other hand, it is suggested that manufacturers of acid produced by wet methods jointly propose to the Sulfuric Acid Industry Association the establishment of a product standard for concentrated sulfuric acid produced by wet methods; the acid concentration specified in this standard should naturally be one that most plants producing acid via wet methods are capable of achieving.
The concentration of the acid produced by the wet process is usually below 98%, as there are technical challenges in increasing the concentration during this process. Increasing the condenser outlet temperature can raise the concentration of the finished acid to a certain extent, but it reduces the absorption rate of SO3 and sulfuric acid vapors, as well as increasing the requirements for the equipment. Therefore, it is suggested that the Sulfuric Acid Industry Association be asked to establish a standard for finished acid that reflects the realities of acid production by the wet process, in order to reduce the pressure on factories to increase the acid concentration. .
This may still be limited by differences in processing characteristics. During the dry-process acid production, when sulfur dioxide is converted into sulfur trioxide, the absence of water vapor allows for the formation of dry sulfur trioxide; as a result, the sulfuric acid produced can have a concentration close to the theoretical value, or it may even be concentrated sulfuric acid, fuming sulfuric acid, or pyrosulfuric acid. However, in the wet process, since water vapor is involved, when the concentration of sulfuric acid produced reaches a certain level, the absorption of water by sulfuric acid prevents sulfur trioxide from being spontaneously converted into sulfuric acid within the water-sulfur trioxide-sulfuric acid system once that concentration is attained. Unless there are significant technological improvements in the process, it is impossible to overcome the physicochemical equilibrium of the aforementioned system.
Can adding sulfur to the furnace increase the concentration?