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1. (WO1993018207) ELECTROLYTE CONTENANT DU TITANE TETRAVALENT ET PREPARATION A PARTIR DE CELUI-CI DE L'AGENT REDUCTEUR TITANE TRIVALENT
Note: Texte fondé sur des processus automatiques de reconnaissance optique de caractères. Seule la version PDF a une valeur juridique
CLAIMS

1. An electrolyte comprising a tetravalent salt of titanium dissolved in a solution of methanesulfonic acid.
2. An electrolyte according to claim 1, which is a catholyte.
3. A catholyte according to claim 2, wherein said tetravalent salt of titanium is selected from the group consisting of titanium oxysulfate, titanium chloride and titanium oxymethanesulfonate.
4. A catholyte according to claim 1, wherein said methanesulfonic acid is in solution in water.
5. A catholyte according to claim 1, wherein the concentration of said tetravalent salt of titanium is about 0.4 to 1 M.
6. A catholyte according to claim 1, wherein the concentration of said methanesulfonic acid is about 0.2 to 10 M.
7. A catholyte according to claim 6, wherein the concentration of said methanesulfpnic acid is about 2-5 M.
8. An electrolytic process for the reduction of titanium(IV) to titanium(III) , the improvement wherein said process is carried out with a catholyte as defined in claim 1.
9. An electrolytic process for the reduction of titanium(IV) to titanium(III) which comprises providing an electrochemical cell as defined in claim 8, and applying sufficient electrical current at the anode and cathode to substantially reduce tetravalent titanium into trivalent titanium.

SUBSTITUTE SHEET

10. Process according to claim 9, which comprises applying a current density of 100 to 10,000 Am"2.
11. Process according to claim 10, which comprises applying a current density of 500 to

4,000 Am"2.
12. In an electrolytic process for the simultaneous reduction of titanium(IV) to titanium(III) and oxidation of cerium(III) to cerium(IV), said process occurring in the same electrolytic cell in which anolyte and catholyte are separated by a membrane or a diaphragm, the improvement wherein said anolyte comprises a cerium(III) salt in solution of an acid and said catholyte is as defined in claim 1.
13. Process according to claim 12, wherein said acid is methanesulfonic acid.
14. Process for the reduction of organic compounds which comprises reacting said organic compounds with a solution of trivalent titanium in methanesulfonic acid.
15. Process according to claim 14, for the reduction of nitrobenzenes into aromatic amines.

16. Process according to claim 15, for the reduction of sulfoxides into sulfides.

SUBSTITUTE SHEET