Distillation: processes – separatory – Distilling to separate or remove only water – From nitric acid
Patent
1993-08-05
1996-03-19
Bascomb, Jr., Wilbur
Distillation: processes, separatory
Distilling to separate or remove only water
From nitric acid
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
Patent
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.
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"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.
Brown Craig J.
Sheedy Michael A.
Bascomb, Jr. Wilbur
Eco-Tec Limited
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