Zirconium -sulfate.tetrahydrate

Zirconium Oxide Chloride Zirconium Oxychloride Zirconium Oxychloride Hydrate Zirconium Sulfate Zirconium Sulfate Tetrahydrate Zirconyl Chloride... 

De Wet A process proposed for extracting zirconium from zircon in the form of zirconium sulfate tetrahydrate. The sodium silicate byproduct should be free from radioactive elements. The key to this process is the formation of an insoluble basic zirconium sulfate as an intermediate. Invented by W. De Wet in South Africa. 

ZnF6Hl206Si zinc hexafluorosilicate hexahydrate 16871-71-9 25.00 2.1040 1 5147 ZrH8012S2 zirconium sulfate tetrahydrate 7446-31-3 25.00 2.8000 1... 

Synonyms Disulfatozirconic acid Sulfuric acid, zirconium (4+) salt (2 1) Zirconium (IV) sulfate Zirconium (IV) sulfate hydrate Zirconium sulfate tetrahydrate Zirconyl sulfate Empihcal OsS r Formula Zr(S04)2 4H2O Properties Wh. cryst. powd. sol. in water forming acidic sol ns. si. sol. in alcohol insol. in hydrocarbons m.w. 283.35 (anhyd.), 355.40 (tetrahydrate) sp.gr. 3.22 bulk dens. 70 Ib/ft m.p. 410 C tetrahydrate loses water of cryst. above 100 C... 

Zinc Phenolsulfonate Octahydrate Zinc Phenolsulfonate Zirconium Sulfate Tetrahydrate Zirconium Sulfate... 

Feng, G. Yang, M. Li, T. Jin, T. A solvent-free procedure for synthesis of coumarins catalyzed by zirconium sulfate tetrahydrate-silica gel under microwave irradiation. Chem. Indian J. 2003, 1, 104-108. 

The anomalous behavior of the sulfated zirconia catalysts is due to the loss of sulfuric acid at elevated temperatures. The catalyst prepared fi-om calcined zirconia looses its sulfuric acid at 673 K and, consequently, is not active at this temperature. As a result, decreasing the temperature of the catalyst to 473 K does not restore the activity. Also the more highly porous catalyst prepared from zirconium hydroxide releases sulfuric acid, but in narrow pores some sulfuric acid is left. The loss of sulfuric acid at 673 K is obviously irreversible. When the catalyst prepared from zirconium hydroxide is, however, kept at 473 K, the transport of water out of the porous structure is thus low that a stable activity is exhibited. Pre-hydration of the bulk anhydrous zirconium sulfate does not provide an active catalyst. That no catalytic activity is induced in this case is due to the fact that bulk anhydrous zirconium sulfete readily reacts to a stable tetrahydrate, viz., Zr(S04)2.4H20 [1]. As a result the hydrolysis of the sulfate by water vapor is suppressed. 

Neutral zirconium sulfate, Zr(S04)2, is prepared by heating zirconia with an excess of concentrated sulfuric acid arid then expelling the excess acid. This salt dissolves slowly in water with the evolution of heat, presumably forming a tetrahydrate, which may be obtained in crystalline form. The normal sulfate is easily hydrolyzed, yielding a solution with a strong acid reaction. Such a solution yields no precipitate or one that forms slowly when oxalie acid or ammonium oxalate is added, while both these reagents produce an immediate precipitate when added to most zirconium salts. On electrolysis of a sulfate solution zirconium concen ... 

The tetrahydrate of the normal sulfate Zr(S04)2 41120 is obtained as a precipitate upon addition of sulfuric acid to an aqueous solution of zirconium(IV). Its structure consists of sheets of coordination number eight antiprisms in which zirconium is bonded by the oxygen atoms of the four water molecules and the oxygen atoms of four sulfate groups. The... 

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