TitanIVchlorid

TitanIVchlorid, also known as titanium(IV) chloride, is a chemical compound with the formula TiCl4. It is a colorless to pale yellow, highly volatile liquid at room temperature that fumes in air. TiCl4 is a strong Lewis acid and reacts readily with water and oxygen, undergoing hydrolysis to form titanium dioxide and hydrogen chloride.

Properties and behavior

TiCl4 is a volatile, corrosive liquid with a boiling point of 136.4 °C. In air, it hydrolyzes to give opaque titanium oxides and HCl gas, so handling requires an inert or dry environment. It reacts with many nucleophiles and forms a variety of titanium(IV) compounds. As a titanium(IV) compound, it is a key starting material for further synthesis.

Production

Industrial TiCl4 is produced by chlorinating titanium-containing ores, such as ilmenite (FeTiO3) or TiO2-containing materials, with chlorine at elevated temperatures. The volatile TiCl4 is then purified by distillation and collected as a liquid, while hydrochloric acid is recovered as a byproduct.

Reactions and uses

TiCl4 serves as a versatile precursor in inorganic and organometallic chemistry. It is employed in the preparation of titanium-containing catalysts for polymerization (notably Ziegler–Natta systems) and as a precursor to other titanium compounds. In the metallurgical sector, it is a key intermediate in the Kroll process, where TiCl4 is reduced with magnesium to produce metallic titanium.

Safety and handling

TiCl4 is highly corrosive and toxic. It fumes in air and reacts violently with moisture, releasing hydrogen chloride. Handling requires dry, inert-atmosphere conditions and compatible equipment, such as fluoropolymer-lined vessels. It should be stored in moisture-free containers and protected from exposure to water and air.