Process for regeneration of volatile acids

Distillation: processes – separatory – Distilling to separate or remove only water – From nitric acid

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203 12, 203 16, 203 35, 203 36, 203 37, 203 41, 203 42, 203 47, 203 84, 203 85, 203 94, 203 95, 203 98, 203100, 203DIG8, 159DIG19, 4233942, 423DIG1, B01D 128, B01D 334

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active

055000983

ABSTRACT:
Volatile acids containing metal salt impurities, such as metal pickling solutions-are regenerated by a process in which the acid is subjected to sulfuric acid distillation. Resulting volatile acid vapor is condensed and recycled to the pickle tank, while the residual acid mixture is treated in an acid sorption unit, preferably of the acid retardation type. Acid sorbed in the acid sorption unit is periodically eluted with water and recycled, while metal impurities are rejected in a deacidified by-product solution.

REFERENCES:
patent: 2993757 (1961-07-01), Dasher et al.
patent: 3383324 (1968-05-01), Hiwatashi
patent: 3401095 (1968-09-01), Saradzhev
patent: 3443991 (1969-05-01), Kremm
patent: 3840646 (1974-10-01), Sugimoto et al.
patent: 4083693 (1978-04-01), Hansen
patent: 4255407 (1981-03-01), Puurunen
patent: 4526650 (1985-07-01), Bloomquist et al.
"The Regeneration of Nitric and Hydrofluoric Acids from Waste Pickling Liquid" by Hu Delu, et al. Presented at Symposium on Iron and Steel Pollution Abatement Technology for 1980, Philadelphia, Pennsylvania, Nov. 18-20, 1980.
"Iron Removal from Pickle Liquors Using Absorption Resin Technology", Iron Control in Hydrometallurgy, Oct. 19, 1986 by W. K. Munns.
"Vapour-Liquid Equilibria of Nitric Acid-Water-Sulphuric Acid Mixtures", The Journal of Applied Chemistry, 7, Apr., 1957 by S. R. M. Ellis, et al.

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