Process for the recovery of sulfuric acid
AssigneeGouvernement du Quebec
InventorDemetre Kougioumoutzakis
Life of this patent
Estimating the term…
Abstract
The disclosure describes the recovery of sulfuric acid from industrial liquors containing the same. A selective liquid-liquid extraction of said liquors is carried out under conditions producing an organic phase containing the sulfuric acid and an aqueous phase eventually containing impurities. The organic phase is treated with a base, such as gaseous NH.sub.3, in order to separate the sulfuric acid. This process is simple, non-polluting, and requires little energy.
Claims16
A process for selectively separating sulfuric acid from liquors containing sulfuric acid and impurities comprising a plurality of metallic ions, which comprises treating by liquid-liquid extraction of said liquors with an organic solvent consisting essentially of tri-isooctylamine, kerosene, and isodecanol under conditions effective to provide a selective liquid-liquid extraction of said liquors to give an organic phase containing the extracted sulfuric acid and substantially no metallic ions, and an aqueous phase containing substantially all said plurality of metallic ions, separating said organic and said aqueous phase, regenerating said organic phase by introducing gaseous NH.sub.3 therein under conditions to form solid (NH.sub.4).sub.2 SO.sub.4, and separating said solid (NH.sub.4).sub.2 SO.sub.4 from said organic phase thereby regenerating said organic solvent including said tri-isooctylamine, kerosene and isodecanol.
Process of recovering sulfuric acid from waste acids derived from the TiO.sub.2 pigments industry, containing sulfuric acid, and vanadium, iron, titanium, aluminum and chromium ions, wherein said waste acids are mixed with a solvent containing 30 volume percent tri-isooctylamine 65 volume percent Kerosene and 5 volume percent isodecanol, during about 5 minutes or less at room temperature, at a pH lower than the pH which precipitates said ions, so as to provide a separation into an aqueous phase containing substantially all the metal ions from the orginial solution, and an organic phase containing an important portion of the sulfuric acid, bubbling NH.sub.3 gas through said organic phase in a stoichiometric quantity to precipitate (NH.sub.4).sub.2 SO.sub.4 which is insoluble in the solvent, separating (NH.sub.4).sub.2 SO.sub.4 by filtration, and recycling said organic solvent.
Dependencies are inferred from the claim text.