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Sodium chlorate

About: Sodium chlorate is a research topic. Over the lifetime, 791 publications have been published within this topic receiving 6844 citations.


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Patent
06 Oct 2010
TL;DR: In this paper, a method adopting starchiness material to prepare high-pure chlorine dioxide was proposed, and the reaction condition is gentle and reaction speed is quick; the reactionis also stable and safe; the operation is convenient; the productivity of chlorine dioxide is high, the purity is high; and the manufacturing cost is low.
Abstract: The invention discloses a method adopting starchiness material to prepare high-pure chlorine dioxide Dried starchiness material and catalyst are added into the sodium chlorate solution and the mass ratio between the sodium chlorate, starchiness material and catalyst is controlled to be 1:080-140:001-01; then the reaction system is heated to 50 to 70 DEG C and then the sulfuric acid of 1/1 isslowly added into the mixture while stirring and the reaction temperature is controlled to be 50 to 90 DEG C and the concentration of the sulfuric acid in the system is 45 to 80mol/L and then the chlorine dioxide is guided out under the negative pressure; and the catalyst is the complex-type ammonium citrate vanadyl The reaction condition is gentle and the reaction speed is quick; the reactionis also stable and safe; the operation is convenient; the productivity of chlorine dioxide is high, the purity is high; and the manufacturing cost is low

6 citations

Patent
01 Apr 2003
TL;DR: In this article, a method of treating residual acid from production of chlorine dioxide is described, in which a compound containing iron is added to the residual acid to react therewith and form a product, which contains iron in trivalent form.
Abstract: A method of treating residual acid from production of chlorine dioxide is described. The method is characterized in that a compound containing iron is added to the residual acid to react therewith and form a product, which contains iron in trivalent form. As iron compound preferably ferrous sulphate is added, which under oxidation reacts with the residual acid to form ferric salt. Preferably sodium chlorate, sodium hypochlorite, hydrogen peroxide or an oxygen-containing gas is added as oxidant.

6 citations

Patent
17 May 1978
TL;DR: In this paper, a reaction product comprising alkali metal chloride, chlorate and hypochlorite is prepared by mixing and chemically reacting an alkyl metal hydroxide solution with chlorine under conditions which favor and promote the conversion of the alkaline metal hypochemite formed during the initial chemical reaction to alkyli metal chlorate without the need for further dilution and acidification of the mixture during the chemical reaction.
Abstract: Both crystals and solutions containing alkali metal chlorates are continuously prepared by chemical followed by electrochemical steps whereby a reaction product comprising alkali metal chloride, chlorate and hypochlorite is prepared by mixing and chemically reacting an alkali metal hydroxide solution with chlorine under conditions which favor and promote the conversion of the alkali metal hypochlorite formed during the initial chemical reaction to alkali metal chlorate without the need for further dilution and acidification of the mixture during the chemical reaction. A portion of the chemical product is electrolyzed in an electrolytic cell to increase the concentration of chlorate for making sodium chlorate crystals and/or R-2 solution, and a portion of the chemical product is also recycled for further use in the chemical reaction with chlorine and alkali metal hydroxide for the continuous preparation of alkali metal chlorate.

6 citations

Journal ArticleDOI
TL;DR: In this article, a pilot cell unit for executing the sodium chlorate process was constructed to study the current efficiency of the anode and cathode separately, and the results showed that the cathodic current efficiency increases with increasing dichromate concentrations in the electrolyte until approximately 5g−3 is reached.
Abstract: Current efficiency in the sodium chlorate process is a key issue in the evaluation of the power consumption. A pilot cell unit for executing the sodium chlorate process was constructed to study the current efficiency of the anode and cathode separately. The effects of sodium dichromate and sodium sulphate concentrations and the electrolyte temperature on the anode and cathode current efficiencies were studied. Corrosion products formed on the mild steel cathodes after their removal from the cell were characterised using X-ray diffraction and infrared spectroscopy. The results show that the cathodic current efficiency increases with increasing dichromate concentrations in the electrolyte until approximately 5 g dm−3 is reached. At this optimum concentration of dichromate, the presence of sulphate ions decreases the cathodic current efficiency. For moderate increases in temperature, the cathodic current efficiency increases, but oxygen evolution is promoted, and the power consumption also increases. Surface characterisation of the electrodes after their exposure to air shows two primary types of behaviour, depending on the process parameters. At low dichromate concentrations, amorphous corrosion layers are formed, while at higher concentrations, reduced forms of iron hydroxides, i.e., “green rust”, are identified. Although the electrodes were positioned at the open circuit potential for 40 min before their removal from the cell, chromium remains on the cathode surface. This result might explain the corrosion-inhibiting effect of the addition of chromate to the electrolyte. The results from this study can be used to optimise operating procedures in real plants, decrease the energy consumption and minimise the environmental impact of these processes.

6 citations

Journal ArticleDOI
TL;DR: Sodium chlorate monocrystals have been grown from aqueous solutions at near ambient temperature and pressure in a system analogous to the industrial hydrothermal method as mentioned in this paper, and the temperature distribution and fluid movements have been determined; the role of the separating disc is discussed.

6 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
20237
202215
202110
202014
201925
201836