Zirconyl chloride octahydrate Chemical Properties

Melting point:

400°C (dec.)

Boiling point:

210°C

Density 

1.91

storage temp. 

Store at +15°C to +25°C.

solubility 

H₂O: soluble

form 

Crystalline Powder

Specific Gravity

1.91

color 

White to light yellow

Odor

Odorless

PH

1 (50g/l, H2O, 20℃)

Water Solubility 

SOLUBLE

Sensitive 

Hygroscopic

Merck 

14,10184

Exposure limits

ACGIH: TWA 5 mg/m3; STEL 10 mg/m3
NIOSH: IDLH 25 mg/m3; TWA 5 mg/m3; STEL 10 mg/m3

Stability:

Stable, but may be moisture sensitive. Incompatible with strong oxidizing agents.

CAS DataBase Reference

13520-92-8(CAS DataBase Reference)

Safety Information

Hazard Codes 

C

Risk Statements 

34-22-37

Safety Statements 

26-36/37/39-45-27

RIDADR 

UN 3264 8/PG 3

WGK Germany 

1

RTECS 

ZH7250000

TSCA 

Yes

HS Code 

2827 49 90

HazardClass 

8

PackingGroup 

III

Toxicity

LD50 orally in Rabbit: 3500 mg/kg

MSDS

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Zirconyl chloride octahydrate Usage And Synthesis

Synthesis

Zircon is melted with caustic soda, rinsed, desiliconized, and then reacted with sulfuric acid, and then ammonia water is added to obtain zirconium hydroxide precipitate. Finished zirconium oxychloride.

Chemical Properties

Tetragonal prisms or needles. Deliquescent in moist air, evolves HCl and becomes dull in dry air. Soluble in H3O (slight hydrolysis) and alcohol. Lower hydrates are formed by heating a stream of HCl. It Liberates HCl on heating in air, and the solubility in water is gradually lost; it reverts to the oxide on calcination. Precipitation of an alcoholic solution with ether or acetone yields dizirconyl chloride Zr aO3Cl a -5HaO, which is sparingly soluble in water. The same compound deposits when a dilute aqueous solution of zirconyl chloride is allowed to stand for a month.

Chemical Properties

solid

Uses

Zirconium dichloride oxide is utilized as a precursor to prepare other zirconium compounds. It is employed in acid dyes, pigment toners and antiperspirants. It finds application as a rubber additive and a fiber treatment agent. It is also used in paint drying, refractories, ceramics and glaze.

Production Methods

Since zircon ZrSiO4, a mineral found in nature, is more difficult to work with, it is better to start from zirconia ZrO2 (baddeleyite), which is calcined, finely ground (the coarser particles are screened off with silk gauze) and converted to the sulfate by evaporation or treatment for several days with an excess of the warm cone. H2SO4. The solid residue, which consists of Zr(SO4)2 and unreacted ZrO2, is taken up in water (the solid is added in small portions to prevent solution heating). The sulfate dissolves slowly, and its solution may be aided by acidifying the water with some hydrochloric acid. The resultant milky suspension, which contains solid undissolved ZrO2 and SiO2 (or ZrSiO4), is allowed to stand for several hours and filtered. The weakly acidic sulfuric acid solution is precipitated with ammonia, and the hydroxide is filtered off. If the precipitate still exhibits a high Si content, it is dissolved in cone and hydrochloric acid and the solution is evaporated to dryness; this procedure is repeated several times. SiO2 and some basic zirconium chloride become the insoluble residue when redissolved in water. If no Si is evident in the hydroxide, the fresh gel is dissolved in cold hydrochloric acid, and the oxychloride is allowed to crystallize by adding cone, hydrochloric acid, or saturating it with HCl. The crystals are filtered and washed with 8N HCl.

General Description

This product is used as a potential green catalyst.

Purification Methods

Recrystallise the chloride several times from water [Ferragina et al. J Chem Soc, Dalton Trans 265 1986]. Recrystallisation from 8M HCl gives the octahydrate as white needles on concentrating. It is also formed by hydrolysing ZrCl4 with water. After one recrystallisation from H2O, 99+% grade zirconyl chloride had Ag, Al, As, Cd, Cu, Hf, Mg, Na, Sc and V at 20, 1.8, 0.6, 0.6, 0.4, 8.4, 0.4, 2.4, 80 and 3 ppm, respectively. (See above.) METAL-ORGANIC COMPOUNDS This section contains metal-organic compounds as well as ammonium and metal salts of organic acids. (For Introduction see p 445.)

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