Experts, are there any of you familiar with the process for producing potassium sulfate using the Mannheim method, or with the equipment used in absorption towers?
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Experts, is there anyone familiar with the process for producing potassium sulfate using the Mannheim method? I have a question: in this process, the water first passes through a packed absorption tower, where the salt acid concentration is increased to 15%; afterwards, it goes through a falling film absorption tower, where the salt acid concentration is raised to 31%. Why are two different absorption towers used for the absorption of hydrogen chloride, rather than just one absorption tower?
The water first passes through the packing absorption tower, after which the sulfuric acid concentration rises to 15%; this is not for the purpose of absorption. Here, the task is mainly to absorb the dust and sulfuric acid gases coming from the exit of the Mannheim furnace, thereby producing crude acid (also known as B acid)； After the packed absorption tower, the hydrogen chloride is relatively pure; upon passing through the falling film absorption tower, the acid concentration rises to 31%. At this stage, the gas is absorbed and the pressure decreases, allowing the liquid film to flow in the same direction as the gas, which facilitates thorough contact and thus high absorption efficiency. Of course, there are also studies on tower-type systems, but they are inefficient and require large-scale equipment.