Bisulfite between

EDTA (ethylenediaminetetraacetic acid, [60-00-4]) chelates any trace metals that would otherwise decompose the hydrogen peroxide [7722-84-1]. The amine is preheated to 55—65°C and the hydrogen peroxide is added over one hour with agitation the temperature is maintained between 60 —70°C. The reaction is exothermic and cooling must be appHed to maintain the temperature below 70°C. After all the peroxide has been added, the temperature of the reaction mixture is raised to 75°C and held there from three to four hours until the unreacted amine is less than 2.0%. The solution is cooled and the unreacted hydrogen peroxide can be destroyed by addition of a stoichiometric amount of sodium bisulfite. This may not be desirable if a low colored product is desired, ia which case residual amounts of hydrogen peroxide enhance long-term color stabiUty. 

The analyses can be carried out in the presence of /V-methy1o1 groups. On fabric, the formaldehyde bisulfite compound is decomposed by excess sodium carbonate and the Hberated sulfite is titrated with 0.1- or 0.01-N iodine solution (76). Commercial fabrics are seldom washed and dried before being used, and the free formaldehyde content may be between 50 and several hundred ppm, depending on finishing and storage conditions. 

The calcium bisulfite acid used in the manufacture of sulfite cellulose is the product of reaction between gaseous sulfur dioxide, liquid water, and limestone. The reaction is normally carried out in trickle-bed reactors by the so-called Jenssen tower operation (E3). The use of gas-liquid fluidized beds has been suggested for this purpose (V7). The process is an example of a noncatalytic process involving three phases. 

A common reaction sequence is shown in the schemes printed above. The sulfosuccinate monoesters are produced by a two-step reaction. In the first step 1 mol of maleic anhydride is reacted with a hydroxyl group-bearing component. In the second step the monoester is reacted with sodium sulfite (or sodium bisulfite) to form the disodium alkyl sulfosuccinate. At the so-called halfester stage, there are two possibilities for an electrophilic attack [61] (Michael-type reaction) at the double bond (Scheme 6). Reactivity differences between the two vinylic carbons should be very small, so that probably an exclusive formation of one single regioisomer can be excluded. 

Reaction between naphthols, bisulfite ion, and ammonia or amines... 

Toxic pollutants found in the mercury cell wastewater stream include mercury and some heavy metals like chromium and others stated in Table 22.8, some of them are corrosion products of reactions between chlorine and the plant materials of construction. Virtually, most of these pollutants are generally removed by sulfide precipitation followed by settling or filtration. Prior to treatment, sodium hydrosulfide is used to precipitate mercury sulfide, which is removed through filtration process in the wastewater stream. The tail gas scrubber water is often recycled as brine make-up water. Reduction, adsorption on activated carbon, ion exchange, and some chemical treatments are some of the processes employed in the treatment of wastewater in this cell. Sodium salts such as sodium bisulfite, sodium hydrosulfite, sodium sulfide, and sodium borohydride are also employed in the treatment of the wastewater in this cell28 (Figure 22.5). 

Aqueous Solution Containing Adduct Formed Between Aldehyde and Bisulfite Anion... 

The syntheses from [4+1] atom fragments, in which the Group 16 heteroatom is introduced between two nitrogen atoms, are the most widely applicable and versatile methods available for construction of the 1,2,5-thiadiazole ring system. These methods have been applied to the synthesis of monocyclic and polycyclic aromatic forms of these ring systems in addition to the direct formation of 1-oxides and 1,1-dioxides, 2-oxides, quaternary salts, and reduced forms. The earliest use of the [4+ 1] synthesis dates back to 1889 when Hinsburg prepared 2,1,3-benzothiadiazole (I) from o-phenylenediamine and sodium bisulfite. 

Mendiara, S. N., E. Ghibaudi, L. J. Perissinotti, and A. J. Colussi, Free Radicals and Diradicals in the Reaction between Nitrous Acid and Bisulfite in Acid Aqueous Media, . /. Phys. Chem., 96, 8089-8091 (1992). 

Hydroxy Sulfonic Acids 0-41 Reaction between epoxides and bisulfite ion... 

Poly(acrylamide) and its acrylic acid copolymers were obtained from polymerization of the monomers in aqueous solution using ammonium persulfate/sodium bisulfite initiator following the procedure reported by Fong and Kowalski.5 Depending on the amount of initiator used, the average molecular weights of the polymers were between 6,000 to 50,000 as determined by gel permeation chromatography (GPC). Taurine (2-aminoethanesulfonic acid) and sodium formaldehyde bisulfite were purchased from Aldrich and used without purification. 

All measurements should be made between 15 min (see step 4) and 1 hr after sample preparation and bisulfite treatment. Longer standing times tend to increase observed readings. 

Addition compounds of sugars and sodium bisulfite are reported by Sundman.49 The rate of decomposition of these substances is primarily determined by the arrangement of hydroxyl groups. When the relationship is trans, more rapid decomposition is noted than when cis. The remainder of the molecule has little effect, although there is also a correlation between the rate of mutarotation and the value of the equilibrium constant. These observations are suggestive of a type of complexing similar to that of the borates. 

In order to generate SOI in acidic media, the reaction between sodium bisulfite and cerium ammonium nitrate should be employed. In (NH4)2Ce(N03)6, cerium has the oxidation state 4+. In acids, valence 4 cerium salts are strong oxidants. With the sulfite ion, the... 

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