Chemistry of inorganic compounds – Halogen or compound thereof – Hydrogen halide
Patent
1995-11-22
1997-12-02
Nguyen, Ngoc-Yen
Chemistry of inorganic compounds
Halogen or compound thereof
Hydrogen halide
423481, 42324401, C01B 713
Patent
active
056933061
ABSTRACT:
A process for producing refined hydrogen iodide having organic components of 0.2 ppm by volume or less and water of 0.1 ppm by volume or less by contacting crude hydrogen iodide with a zeolite is disclosed. Crude hydrogen iodide is obtained by reducing iodine with a hydrogenated naphthalene, wherein all of the iodine is dissolved in advance in a portion of the hydrogenated naphthalene to prepare an iodine solution, and the reaction is carried out while adding continuously or intermittently the iodine solution to the balance of the hydrogenated naphthalene. The same operation may be repeated in succession using unreacted hydrogenated naphthalene and fresh iodide. The zeolite is contacted in advance with crude hydrogen iodide, the amount of which is at least 1/3 (weight ratio) relative to the amount of the zeolite, to convert impurities of sulfur components contained in the zeolite to hydrogen sulfide, thereby removing the sulfur components. Further, an activated carbon may be combined with the zeolite at the rear stage thereof.
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Omura Masahiro
Sasaki Kenju
Tanaka Yoshinori
Tomoshige Naoki
Utsunomiya Atsushi
Mitsui Toatsu Chemicals Inc.
Nguyen Ngoc-Yen
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