Separation of acetic acid and nitric acid
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Let’s discuss whether there are any good methods to separate a mixed aqueous solution of acetic acid and nitric acid.
Extraction should be possible; by using an extractant that does not hydrolyze under strong acidic conditions, such as chelating extractants like trioctylamine derivatives, which have a high distribution coefficient for acetic acid, it is possible to obtain an extract phase containing acetic acid and a raffinate phase containing nitric acid. The extract phase can yield acetic acid of high purity through back-extraction or distillation
This is a problem: in the field of environmental protection, we encounter large amounts of mixed waste liquid containing nitric acid and acetic acid, which is difficult to treat. Some units that do not meet environmental standards simply mix the mixed waste liquids with limestone, and then send the mixture to cement kilns for calcination. I’m looking for friends with extensive engineering experience in the chemical industry to offer some guidance.
This should be an academic topic; those who are into research can get to work!
Nitric acid and acetic acid can be separated by combining crystallization, extraction, and distillation processes, although the process route will be longer.