Chemistry of inorganic compounds – Halogen or compound thereof – Ternary compound
Patent
1998-10-29
2000-01-25
Nguyen, Ngoc-Yen
Chemistry of inorganic compounds
Halogen or compound thereof
Ternary compound
423184, 423462, 423472, C01B 1122
Patent
active
060175060
ABSTRACT:
Process for the preparation of a sodium paraperiodate wherein an iodine compound is converted into the sodium paraperiodate in the presence of Na.sup.+ ions by means of an alkali metal hydroxide and an alkali metal hypochlorite. The iodine compound is applied in the form of an iodine-containing mixture in which besides the iodine compound in the form of I.sub.2, iodide or iodate compounds, one or more compounds chosen from the group of chlorides, bromides, sulphates, sulphites, carbonates, bicarbonates, nitrates and dissolved organic components are also present. The invention also relates to the preparation of sodium metaperiodate and other alkali and alkali earth metal periodates, wherein the sodium paraperiodate obtained is converted into sodium periodate or into an alkali or alkali earth metal periodate by means of an acid or an alkali and alkali earth metal salt at an elevated temperature. The acid used preferably is HNO.sub.3.
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Utsunomiya et al.; Production of Disodium Trihydrogen Paraperiodate; Patent Abstracts of Japan; JP 04-202001; Jul. 22, 1992.
Roques, et al.; Preparation des periodates; J. Pharm. Chim.; vol. 6, No. 16, 1902; pp. 120-121.
Dijt Antonius L. B.
Eder Rudolf M.
Martens Wilhelmus R. M.
Tinge Johan T.
Wisse Jan C.
DSM N.V.
Nguyen Ngoc-Yen
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