Sodium chlorite preparation

Chlorine dioxide, discovered in 1811 by Davy, was prepared from the reaction of potassium chlorate with hydrochloric acid. Early experimentation showed that chlorine dioxide exhibited strong oxidizing and bleaching properties. In the 1930s, the Mathieson Alkali Works developed the first commercial process for preparing chlorine dioxide from sodium chlorate. By 1939, sodium chlorite was established as a commercial product for the generation of chlorine dioxide. 

Hypophosphoric acid, (H0)2P(0)-P(0)(0H)2, is usually prepared by the controlled oxidation of red P with sodium chlorite solution at room temperature the tetrasodium salt, Na4P2O6.10H2O, crystallizes at pH 10 and the disodium salt at pH 5.2 ... 

One feature of this oxidation system is that it can selectively oxidize primary alcohols in preference to secondary alcohols, as illustrated by Entry 2 in Scheme 12.5. The reagent can also be used to oxidize primary alcohols to carboxylic acids by a subsequent oxidation with sodium chlorite.34 Entry 3 shows the selective oxidation of a primary alcohol in a carbohydrate to a carboxylic acid without affecting the secondary alcohol group. Entry 5 is a large-scale preparation that uses NaC102 in conjunction with bleach as the stoichiometric oxidant. 

For a time the parent compound 11.57, easier to prepare than its methylsulphonyl derivative 11.55, was also marketed. This was capable of producing brilliant whites on acrylic fibres that were exceptionally violet in tone. If violet brightening effects of good light fastness are required they can be achieved in combination with sodium chlorite using the... 

A bleach solution was being prepared by mixing solid sodium chlorite, oxalic acid, and water, in that order. As soon as water was added, chlorine dioxide was evolved and later exploded. The lower explosive limit of the latter is 10%, and the mixture is photo- and heat-sensitive [1]. It was calculated that the heat of reaction (1.88 kJ/g of dry mixture) would heat the expected products to an adiabatic temperature approaching 1500°C with an 18-fold increase in pressure in a closed vessel [2],... 

Also, it may be prepared by the reaction of chlorine with sodium chlorite 2NaC102 + CI2 -> 2CIO2 + 2NaCl... 

Benzo[ ]perimidinone carbaldehyde and carboxylic acid derivatives have also been prepared by alkyl oxidation. Thus, treatment of the 2-methyl derivative 588 with selenium dioxide at reflux in dioxane gave the aldehyde 589, which then gave carboxylic acid 590 on reaction with sodium chlorite <2001JME2004>. 

K. G. Thurnlackh and K. F. von Hayn prepared a mixed soln. of potassium chlorate and chlorite by the action of potassium hydroxide free from chlorine on a soln. of chlorine dioxide. Light was carefully excluded, and the soln. was evaporated in vacuo at 45°-50°—potassium chlorate separated out first, and after further evaporation, alcohol was added, and the clear alcoholic soln. evaporated. Needle-like crystals of potassium chlorite, KC102, were obtained which deliquesced on exposure to air. As already indicated in connection with the preparation of the acid, G. Bruni and G. Levi made the potassium chlorite by reducing a soln. of potassium chlorate with oxalic acid and A. Reychler, sodium chlorite, by the action of chlorine dioxide on a soln. of sodium peroxide. Sodium chlorite, NaClQ2, can be also made by double decomposition by treating a soln. of barium chlorite with sodium sulphate and evaporating the clear soln. in vacuo. 

While attempting silver recovery from spent developer, a commercial preparation, described as sodium chlorite, was added to the developer, causing violent reaction and spraying the experimenter. There is a suggestion that ammonia was present, and sodium hydroxide, despite which it is claimed that hydrochloric acid was part of the gas release. Poor mixing was involved. Developers being reducants, no involvement of the other destabilising materials (silver, ammonia) need be assumed. 

Sodium chlorite, analysis of, for preparation of chlorine (IV) oxide, 4 156 Sodium cyanate, 2 88 Sodium diimidothiophosphate, formation of, from thiophosphoryl triamide, 6 112... 

Defatted jute was prepared by treating it with alcohol-benzene (1 2v/v) mixture in a Soxhlet apparatus, washed well with alcohol and air dried. Bleaching of jute fiber was carried out with 0.7% sodium chlorite following a special method (17) KPM rayon sample was prepared by treating it with dilute soap solution, washed well and dried. 

Of the various methods for preparing disodium dihydrogen hypophosphate, the one depending upon the oxidation of red phosphorus with sodium chlorite seems to be the best, considering both the yield and the simplicity of the procedure. In this reaction, phosphites and orthophosphates... 

The manufacture of sodium chlorite starts from chlorine dioxide C102. It can easily be prepared in a laboratory by heating a mixture of powdered potassium chlorate and oxalic acid to 70 °C. The gas escaping will contain carbon dioxide and chlorine dioxide. 

Preparation of Pulp Having Different 7-Cellulose Contents. Unbleached pulp (50 hardwood kraft-50 softwood kraft) was subjected to chloriting treatment to remove lignin. The chemicals and conditions employed were the following 25 g of sodium chlorite, 12.5 mL of glacial acetic acid, a pulp consis-... 

N. A, E. Millon prepared soln. of potassium chlorite and sodium chlorite by adding chlorous acid slowly and gradually to a soln. of the alkali hydroxide until the product has a yellow colour. By rapidly evaporating the soln. to complete dryness, a deliquescent salt was obtained which, at 160°, decomposes into chlorate and chloride. This decomposition occurs if the soln. be slowly evaporated in vacuo. If an excess of chlorous acid is used with the pot ash-lye, a red liquid is obtained which gives off the acid on evaporation, and leaves a residue of the neutral salt. It has been suggested that the red liquid is a soln. of add potassium chlorite. 

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