Perov, E. V.; Stolyarenko, G. S. published the article 《Concentration of nitric acid by crystallization of hydrates》. Keywords: nitric acid concentration; crystallization hydrate acid concentration.They researched the compound: Aluminum(III) sulfate xhydrate( cas:17927-65-0 ).COA of Formula: Al2H8O13S3. Aromatic heterocyclic compounds can be divided into two categories: single heterocyclic and fused heterocyclic. In addition, there is a lot of other information about this compound (cas:17927-65-0) here.
The concentration of dilute HNO3 solutions by crystallization of hydrates of K, Na, Ca, Mg, Fe, and Al sulfates was studied. Pos. results were obtained only with Al2(SO4)3. Anhydrous Al2(SO4)3 was added to 40-60% HNO3 solution at 90-5°. Cooling to 25-30° precipitated Al2(SO4)3-hydrate from which HNO3 was separated by filtration or distillation at 100-50 mm pressure to give 73.5-5.8% HNO3 solution The yield was 93.5-4.8%.
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Reference:
Isothiazole – Wikipedia,
Isothiazole – ScienceDirect.com