Process for regeneration of acids from spent acids
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United States of America Patent
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Sep 17, 2002
Grant Date -
Apr 4, 2002
app pub date -
Mar 21, 2000
filing date -
Mar 22, 1999
priority date (Note) -
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Abstract
A process for regenerating spent acid liquor feeds an acid liquor into a reactor having a first heating zone for evaporating a substantial portion of the liquid from the spent acid to produce acid vapors and metal salts without decomposing the acid. The metal salts are transferred to a second heating zone where the salts are roasted to form metal oxides. The acid vapors from the primary roasting furnace are then transferred to an absorption column to regenerate the acid. The first heating zone is operated at a temperature below the decomposition temperature of the acid and the metal salts. The second heating zone operates at a higher temperature to completely oxidize the metal salts.
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