Uranium acetic-hydrochloric acid

Anion exchange in hydrochloric acid/acetic acid medium for selective sorption of uranium as its anionic chloride/acetate complex (190, 191). 

Amine Extraction. Tri-n-octylamine was prepared by repeated washing of tri-n-octylammonium chloride with IN NH4OH followed by washing with water. Uranium extraction experiments were performed with U-233 tracer which contained a small amount of hydrochloric acid. Successive backwashing of extracts with acetic acid was used to eliminate the chloride. Np-237 and Pu-239 were oxidized with ozone and back-washed two or three times to eliminate lower oxidation states. 

TOLUOL (108-88-3) C7H, CsHjCHj Forms explosive mixture with air [explosion limits in air (vol %) 1.4 to 6.7 flash point 39°F/4°C cc autoignition temp 896°F/480°C Fire Rating 3]. Violent reaction with strong oxidizers, bromine, bromine trifluoride, chlorine, hydrochloric acid-sulfuric acid mixture, l,3-dichloro-5,5-dimethyl-2,4-imidazolididione, dinitrogen tetraoxide, fluorine, nitric acid (cone.), nitrogen dioxide, silver chloride, sulfur dichloride, uranium fluoride, vinyl acetate. Forms explosive mixture with strong acids, strong oxidizers, silver perchlorate. 

Five grams (0.012 mol) of powdered uranyl acetate 2-hydrate is dissolved in 100 ml. of warm (80°) dilute hydrochloric acid (10 ml. of concentrated hydrochloric acid and 90 ml. of water). Five grams (0.024 mol) of powdered sodium dithionite 2-hydrate is added in small amounts while the solution is stirred. As the dithionite comes in contact with the solution a brown material is formed that quickly changes to a whitish-green precipitate. Five milliliters of concentrated hydrochloric acid is added and the mixture is then heated on a steam bath for at least 10 minutes mtil solution has been effected. The solution is usually cloudy due to the formation and presence of a small amount of free sulfur. The latter is easily removed by filtration, yielding a filtrate that possesses the characteristic dark green color of the uranium(IV) ion. 

To a sample of 500 ml, 50 ml of arsenazo-III solution (ImgmH ) and 50 ml of ImoH acetate buffer solution (pH 3.5) are added. The resulting urani-um(VI)-arsenazo-III anion complex is floated with 4 ml of tetradecyldimethylbenzylammonium chloride solution (lOmgmH ) and a scum is formed on the solution surface. After the suction of the mother liquor through the sintered-glass disk, the scum is ignited and then dissolved in 5 ml of 9 mol 1 hydrochloric acid for the spectrophotometric determination of uranium. 

Immerse in 9 1 acetic acid-hydrochloric acid bath for 3 min. Note that 200 mL of this bath can accommodate no more than 4 bars of 11.4 cm X 2.5 cm x 0.3 cm dimensions without a rigorous reaction taking place and a black film forming on the uranium surface... 

Mooro 7 has also Investigated the extraction of uranium (Vl) from acetic acid solution by TlOA. Extractions were carried out In the same manner as those from hydrochloric acid solution (figure 53). Aqueous solutions of varying... 

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