After drying, concentrated sulfuric acid contains 75-85% sulfuric acid; how can it be purified and concentrated further?
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The COD level is around 200,000–300,000; after simple hydrolysis and stripping followed by concentration, the color turns black. I would appreciate any suggestions you might have – thank you
First, let’s introduce the materials used in this process and the problems it aims to solve. Isn’t concentration nothing but evaporation?
I have relevant experience in handling this, feel free to contact me to discuss it
Numerous practical installations for the pyrolytic regeneration of spent sulfuric acid are already in use, with the production capacity of regenerated sulfuric acid ranging from tens of thousands of tons per year to 400,000 tons or even more. Domestic technologies are available from institutions such as the Research Institute of Nanjing Nanhua Group ； The technologies introduced include those from the American company Monomock, among others. Typical units, such as the waste sulfuric acid pyrolysis and regeneration plants of Sinopec Shihua and Jihua Group, have a design capacity of 400 kt/a each. In addition to treating waste sulfuric acid, it can also process waste liquids rich in sulfuric anhydride, ammonium bisulfate, etc., to produce products such as 98% industrial sulfuric acid. .