With sodium chlorite

Other Cellulosics. Rayon is bleached similarly to cotton but under milder conditions since the fibers are more easily damaged and since there is less colored material to bleach. Cellulose acetate and triacetate are not usually bleached. They can be bleached like rayon, except a slightly lower pH is used to prevent hydrolysis. The above fibers are most commonly bleached with hydrogen peroxide. Linen, dax, and jute requite more bleaching and mil der conditions than cotton, so multiple steps are usually used. Commonly an acidic or neutral hypochlorite solution is followed by alkaline hypochlorite, peroxide, chlorite, or permanganate, or a chlorite step is done between two peroxide steps. A one-step process with sodium chlorite and hydrogen peroxide is also used. 

Synthetic Fibers. Most synthetic fibers are sufficientiy white and do not requite bleaching. For white fabrics, unbleached synthetic fibers with duorescent whitening agents are usually used. When needed, synthetic fibers and many of theit blends are bleached with sodium chlorite solutions at pH 2.5—4.5 for 30—90 min at concentrations and temperatures that depend on the type of fiber. Solutions of 0.1% peracetic acid are also used at pH 6—7 for 1 h at 80—85°C to bleach nylon. 

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 ... 

OXIDATION OF PRIMARY ALCOHOLS TO CARBOXYLIC ACIDS WITH SODIUM CHLORITE CATALYZED BY TEMPO AND BLEACH 4-METHOXYPHENYLACETIC ACID... 

Primary and secondary aliphatic nitro compounds have been oxidized to aldehydes and ketones, respectively (RR CHN02 RR C=0) with sodium chlorite under phase-transfer conditions, TPAP, Oxone , as well as with other reagents. 

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. 

Mono-, di-, and trisubstituted olefins undergo osmium-catalyzed enantioselective dihydroxylation in the presence of the (R)-proline-substituted hydroquinidine 3.9 to give diols in 67-95% yields and in 78-99% ee.75 Using potassium osmate(VI) as the catalyst and potassium carbonate as the base in a tm-butanol/water mixture as the solvent, olefins are dihydroxylated stereo- and enantioselectively in the presence of 3.9 and potassium ferricyanide with sodium chlorite as the stoichiometric oxidant the yields and enantiomeric excesses of the... 

The light fastness of the vic-triazole 11.17 on nylon is 4-5 as on cotton this is significantly superior to that of the DAST derivatives. Unlike the DAST types, the vic-triazole is also stable towards a sodium chlorite bleach. Applied to nylon in combination with sodium chlorite, compound 11.17 can give exceptionally high whiteness and excellent fastness properties. 

FBA may be applied by exhaustion from the same bath. If the polyester portion of the blend is to be bleached with sodium chlorite, the cotton is usually brightened in a second step since most FBAs for cotton are destroyed by sodium chlorite. Both types of FBA are normally compatible with a hydrogen peroxide bleaching process. 

Type B brighteners can be applied in the absence of bleach, of course, but show their best results when applied simultaneously with sodium chlorite, where they are capable of giving exceptionally high whiteness. 

As an alternative to oxidative bleaching with sodium chlorite, acrylic fibres may be given a reductive bleach using sodium bisulphite in the presence of oxalic acid. This method is... 

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... 

Oxidation of the tetrahydroindolizine 338 with sodium chlorite gives the lactam 339, which rapidly lactonizes to give the pyranoindolizine 340 (Equation 122) <2001T8647>, and the one-pot , three-component reaction between the keto ester 235, acrolein, and o-aminophenol (formally analogous to that of Equation 63) gives the benzoxazolo-naphthyridine 341 (Equation 123) <20010L2145>. 

The concentration of residual chlorite ion in vegetables and eggs treated with sodium chlorite was determined by UV-ion chromatography (Suzuki et al. 1997). Sodium chlorite was extracted with water and cleaned-up using Cl 8 cartridge. The detection limit of sodium chlorite in vegetables and eggs was 1 mg/kg with recoveries of 90-100%. 

Gill MW, Swanson MS, Murphy SR, et al. 2000. Two-generation reproduction and developmental neurotoxicity study with sodium chlorite in the rat. J Appl Toxicol 20 291-303. 

Suzuki J, Okumoto C, Katsuki Y, et al. 1997. Determination of residual chlorite in vegetables and eggs treated with sodium chlorite by UV-ion chromatography and effect of soaking in water. J Food Hyg Soc Jpn 38(l) 22-26. 

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>. 

Synthetic Fibers. Most synthetic fibers are sufficiently white and do not require bleaching, When needed, synthetic fibers and many of their blends ane bleached with sodium chlorite solutions. Solutions of 0.1% peracetic acid are also used,... 

This process is a lower-cost method of providing bromine chemistry to large cooling systems, where conventional BCDMH or similar chemistry is cost-prohibitive (see Section 6.2.7 on bromine chemistry). In addition, bleach is often used as a raw material, with sodium chlorite, for the on-site production of chlorine dioxide (see Section 6.2.6). 

Following the periodate oxidation, the 2,3-dialdehyde celluloses were either reduced with potassium borohydride to form the dialcohol or oxidized with sodium chlorite to give dicarboxyl celluloses. The strength loss of the former products was kept lower than 27% and that of the latter 37%. 

Carbonyl group contents of Al-cellulose increased with prolonging the sodium periodate oxidation time, with very little formation of carboxyl groups. Oxidizing Al-cellulose with sodium chlorite converted 90-97% of carbonyl groups into carboxyl groups (Cd-cellulose). The results indicate that the bond between C2 and C3 position of glucose unit is open. 

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... 

Chlorine dioxide is manufactured on site as the gas cannot be stored in compressed form it is explosive under pressure. Several methods are used to generate chlorine dioxide. The most common method involves the reaction of chlorine gas with sodium chlorite to form chlorine dioxide and sodium chloride ... 

The reactivity of an oxidizer varies depending on the combustible substance used. Sulfur and red phosphorus are higher in reactivity with sodium chlorite and sodium chlorate than ethylene glycol. 

The Step 5 product (42.11 mmol) was added to 198 ml THF/r-butyl alcohol/2-methyl-2-butene, 1 1 1.3, cooled to 0°C, then treated with sodium chlorite (331.1 mmol), and sodium dihydrogen phosphate monohydrate (256.7 mmol) dissolved in 102 ml water. The biphasic solution was stirred for 10 minutes at 0°C and then 1 hour at ambient temperature and was then concentrated. The residue was diluted with 200 ml water and the pH adjusted to 3 using saturated NaHC03 solution and 1M HC1. The aqueous solution was extracted four times with THF/CH2C12, 1 2, dried with MgS04, and concentrated. The residue was purified by trituration with diethyl ether and the product isolated in 88% yield as a white solid. 

A non-dusting auxiliary used in conjunction with sodium chlorite to supress the chlorine dioxide fumes generated in bleaching. 

CNC INHIBITOR SC is fully compatible with sodium chlorite and surfactants. 

---