Showing papers on "Sodium chlorate published in 1975"

Method of producing chlorine dioxide

Abstract: Chlorine dioxide is produced by the reaction of sodium chlorate with sulfur dioxide in the presence of gaseous chlorine.

Ion exchange chromate removal

Abstract: The present invention relates to removal of chromate from an aqueous solution of an alkali metal chlorate and chloride, particularly sodium chlorate and sodium chloride in a selected ratio which has been obtained by the electrolysis of an aqueous solution of alkali metal chloride containing chromate in which the essentially chromate free aqueous solution of alkali metal chlorate and chloride contains the chlorate and chloride in essentially the same selected ratio. In the process the chromate containing aqueous solution of alkali metal chlorate and chloride is acidified with hydrochloric acid to a pH value not smaller than 0.5 and passed through an anionic ion exchange resin bed which has previously been saturated with alkali metal chlorate and chloride. The bed is then regenerated by passing an aqueous solution of an alkali metal hydroxide and alkali metal chloride therethrough to remove chromate therefrom. An acidified aqueous solution of alkali metal chloride is then passed through the bed to convert the resin to an acid form and an aqueous solution of essentially chromate free alkali metal chlorate and chloride acidified with hydrochloric acid to a low pH value but not smaller than 0.5 is passed through the bed to saturate the resin with the alkali metal chlorate. The effluents from the regeneration stages may then be used as feedstock for the electrolysis to produce the aqueous solution of alkali metal chlorate and chloride, after suitable additions of chromate and chloride solutions.

3-Deoxy-2-ketoaldonic acids.

Abstract: Publisher Summary This chapter describes 3-deoxy-2-ketoaldonic acids. The α -hydroxy group of a 3-deoxyaldonic acid is selectively oxidized by chlorate in the presence of vanadium oxide and phosphoric acid, and the keto acid is isolated by chromatography on cellulose powder. Methyl 3-deoxyheptonate is prepared from commercial 2- deoxy -D-arabino- hexose (2- deoxyglucose). But, the melting point of the crystalline material varies from one preparation to another owing to the presence of varying amounts of epimers (D-gluco and D-manno-) in the sample. The ratio of the epimers does not affect the yield or the quality of the final product. Galactometasaccharinic acid lactone is a mixture of 3-deoxy D-xylo- and D-lyxo-hexonic acid lactones. For the preparation of ammonium 3-deoxy D -threo- hex-2-ulosonate, this lactone (3.2 g) is first hydrolyzed with sodium hydroxide and then treated with sodium chlorate (740 mg), vanadium oxide (120 mg), and phosphoric acid (0.1 ml) as described for the 7-carbon homolog. Detection of 3-deoxyaldulosonic acids on chromatograms and detection of polyhydroxy compounds on paper chromatograms are also discussed.

Elastic constants of sodium chlorate from 77 K to 350 K

Abstract: The elastic constantsC 11,C 12 andC 44 of sodium chlorate single crystal have been evaluated using 10 MHz ultrasonic pulse echo superposition technique. The values areC 11=4.90,C 12=1.39,C 44=1.17 (× 1010 N/m 2) at 298 K and 6.15, 2.16, 1.32 (×1010 N/m 2) at 77 K. The data agree well with the values measured earlier up to 223 K. Brief mention is also made of the low temperature bonding problems in these soft crystals.