Sodium tetrasulfide

A double end point, acid—base titration can be used to determine both sodium hydrosulfide and sodium sulfide content. Standardized hydrochloric acid is the titrant thymolphthalein and bromophenol blue are the indicators. Other bases having ionization constants in the ranges of the indicators used interfere with the analysis. Sodium thiosulfate and sodium thiocarbonate interfere quantitatively with the accuracy of the results. Detailed procedures to analyze sodium sulfide, sodium hydro sulfide, and sodium tetrasulfide are available (1). 

The H2S sulfanes are the subject of several reviews (129,133). Except for hydrogen sulfide these have no practical utiUty. Sodium tetrasulfide [12034-39-8] is available commercially as a 40 wt % aqueous solution and is used to dehair hides in taimeries, as an ore flotation agent, in the preparation of sulfur dyes (qv), and for metal sulfide finishes (see Leather Mineral recovery and processing). 

The blue color of 83 has been observed in numerous experiments. For example, a brilliant blue color occurs if a potassium thiocyanate melt is heated to temperatures above 300 °C [132] or if eutectic melts of LiCl-KCl (containing some sulfide) are in contact with elemental sulfur [132, 133], if aqueous sodium tetrasulfide is heated to temperatures above 100 °C [134], if alkali polysulfides are dissolved in boiling ethanol or in polar aprotic solvents (see above), or if borate glasses are doped with elemental sulfur [132]. In most of these cases mixtures of much 83 and little 82 will have been present demonstrating the ubiquitous nature of these radicals [12]. 

Ingot casting, 23 266 Ingot production, titanium, 24 857 Inhalation. See also Dust inhalation hydrogen fluoride, 14 17-18 influence on toxicity, 25 211 of PVC dust, 25 676-677 of sodium tetrasulfide, 22 875 studies of, 25 227t of sulfuric acid, 23 794 of toluene, 25 179t of VDC, 25 692-694 Inhalation anesthetics, 11 867-868 Inhalation exposure... 

See also Sodium sulfates in sodium tetrasulfide preparation, 22 874... 

Sodium tetrahydroborate, 4 193-197 economic aspects, 4 228 physical properties of, 4 194t Sodium tetrasulfide, 22 874-875 chemical analysis of, 22 875 health and safety factors related to, 22 875... 

The most widely used dihalide is 1,2-dichloroethane. The use of polyhalides (e.g., 2% 1,2,3-trichloropropane) results in the formation of branched or crosslinked products. Sodium tetrasulfide (Na2S4) is generally used as the polysulfide since it contains scarcely any of the monosulfide which reacts with dihalides to form cyclic by-products with unpleasant odors. 

We carried out the reaction of polysulfide with acrylic add as a pseudo first-order reaction using excess sodium tetrasulfide at 40°C in seawater medium. The addition product, presumably 3-tetrasulfidopropionic add (Equation 3) was then cleaved with tributyl phosphine to 3-mercaptopropionic add just prior to HPLC analysis (Equation 4). 

The parent system 1,3,4-oxadithiolane (12) was claimed to be formed on reacting a,a -dichlorodimethyl ether with sodium tetrasulfide in the presence of a base and subsequent steam distillation of the polymer obtained. However, since neither a structural proof nor any properties were described, the existence of this ring system should be considered in doubt (66HC(2l-l)l>. 

Reaction of allenes with a sulfur-atom donor (e.g., 2-phenylthiirane, 2-methylthiirane, sodium tetrasulfide, or elemental sulfur) in the presence of molybdenum oxo complexes gave the appropriate vinylthiirane in moderate to quantitative yield (Scheme 89 Table 15) <2003JA3871>. 

Selenium Chloride 10026-03-6 Sodium Diacetate 126-96-5 Sodium Tetrasulfide 12034-39-8... 

In 1922 independent inventor and physician Joseph C. Patrick (1892-1965) was trying to make ethylene glycol (HOCH2CH2OH) to be used as antifreeze. Instead he discovered Thiokol (a trade name that has become generic), a rubbery polysulfide condensation product of ethylene dichloride and sodium tetrasulfide. This early product is still used for gaskets, sealants, sealer adhesives, and hoses because it is resistant to oil and organic solvents. 

The reaction of ethylene dichloride with sodium tetrasulfide to yield rubbery polymers was discovered independently by Patrick in the United States and Baer in Switzerland. This pol3uner was commercially introduced in this country in 1930 under the trade-mark of Thiokol. The I.G. Farbenindustrie in Germany manufactured the product as Perduren. 

The reaction of ethylene dichloride with sodium tetrasulfide proceeds with the elimination of sodium chloride. Both reactants are bifunctional and hence proceed to produce a condensation pdymer of high molecular weight. 

Sodium tetrasulfide formed from alcoholic solution is a hygroscopic, orange-yellow crystalline powder. The aqueous solution is yellow at room temperature and dark red at the boiling point. Becomes brown on heating, begins to sinter at 284°C, melts at 286°C to a brown-black mass. After solidification, the substance is green, d (20°C) 2.08. 

---