Sodium sulfate treatment during the operation of the waste sulfuric acid concentration unit for drying chlorine gas
Thread Content
The waste sulfuric acid used to dry chlorine contains some sodium sulfate (Na2SO4); as the concentration is increased during the concentration process, the level of sodium sulfate increases as well, and the filtration equipment used earlier is not capable of removing the sodium sulfate dissolved in sulfuric acid. I originally thought this problem was very difficult to solve. However, during actual operation, sodium sulfate increases as the temperature rises (to 200 degrees) and the sulfuric acid concentration increases. Sodium sulfate dissolved in sulfuric acid, with an increasingly smaller amount of aqueous solution. Crystallization will occur and overflow; acid sludge will form and settle inside the tank without dehydration, and this will not affect the quality of sulfuric acid produced as a result of concentration processes. The reactor only needs to be cleaned after running for a while.
What does an evaporator look like? Will it crystallize and precipitate on the wall of the heating tube?
Should an MVR evaporator be used? What concentration can the concentrated sulfuric acid reach? What is the energy consumption like, and how do the costs compare to those of buying new sulfuric acid?
Is what crystallizes out sodium sulfate decahydrate? Can anhydrous sodium sulfate be used to remove the water from sulfuric acid and carry away its crystal water as sodium sulfate decahydrate?
It depends on the sulfuric acid content in the original waste liquid!