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US 9,731,979 B2Granted
Purification of titanium tetrachloride
AssigneeCristal USA Inc.
InventorsBela Derecskei, Alexandre Jean Fines, Alastair Valentine
Life of this patent
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Abstract
Disclosed is a process/system for the removal of metal chloride impurities from a titanium tetrachloride stream. The metal chloride impurities are removed through contact of the titanium tetrachloride stream with an alumino-silicate material, which can be selected based on certain properties of the alumino-silicate and based on the geometries of the impurity(ies) and the alumino-silicate.
Claims33
A titanium tetrachloride purification process comprising the steps of:
- a) contacting an adsorbent with a feedstock comprising titanium tetrachloride and at least one impurity, wherein at least a portion of the at least one impurity is adsorbed on the adsorbent to thereby form a product stream having a reduced amount of the at least one impurity, wherein said at least one impurity comprises a compound selected from the group consisting of carbonyl sulfide, sulfur dioxide, phosgene, hydrogen sulfide, carbon disulfide, and chlorides and oxychlorides of:
- post transition metals, metalloids, zirconium, hafnium, iron, chromium, copper, carbon, manganese, vanadium, nickel, thorium, uranium;
- and combinations thereof, and wherein the adsorbent comprises a faujasite zeolite having an average channel size in the range of from about 6.5 Å to about 7.5 Å and selected for the removal of the at least one impurity based on:
- i) the geometric size of the at least one impurity, and ii) the channel size of the faujasite zeolite;
- and
- b) withdrawing said product stream from said adsorbent having said at least one impurity adsorbed thereon.
3 more elements
Dependencies are inferred from the claim text.