Sulfuric acid sodium chloride reaction

In both polymerizations, the unieacted monomer has to be removed. In the hot one the reaction is often quenched by addition of hydroquinone, and in the cold one by addition of N,N-diethyldithiocarbamate. After the monomers are steam-stripped in both processes, an antioxidant like -phenyl-2-naphthylamine is added. The latex is usually coagulated by addition of a sodium chloride-sulfuric acid solution. 

Chlorine was the first halogen to be isolated as a free element. In 1774, C. W. Scheele liberated chlorine by reaction of sodium chloride, sulfuric acid, and manganese dioxide,... 

Similarly, fluorosulfonyldifluoroacetic acid can be decarboxylated easily to give difluoromethanesulfonic acid by using catalytic amounts of sodium chloride, but the reaction can proceed readily to the next step, resulting in loss of sulfur dioxide and formation of difluorocarbene [101, 102] (equations 68 and 69)... 

Suitable agents are chlorosulfonic acid, monohydrate, or concentrated sulfuric acid. Other methods include cyclization of phenylthioglycolic acid chlorides, which is afforded by Friedel-Crafts reaction with aluminum chloride, possibly in the presence of sulfuric acid/sodium chloride. The acid chloride is obtained from phenylthioglycolic acid with thionyl chloride or phosphorus trichloride. 

Phthalein type dyes have been prepared from 2,3-dicarboxypyrazine by heating with phenols or aromatic amines and zinc chloride. For example, compound (25) was obtained with resorcinol (1353). Efforts to prepare 2,6-diaminopyrazine through a Curtius-Schmidt reaction on 2-acetamido-6-carboxypyrazine (with sodium azide, sulfuric acid, and trichloroacetic acid) proved unsuccessful (434). The preparation of bicyclic heterocyles from 2-amino-3-carboxypyrazines has been described in Section VIII. 1D(6). 

Benzene (Table I, p. 165). Some of the factors involved in the industrial sulfonation of benzene have been discussed. In the small-scale, laboratory preparation, where the difference in cost between sulfuric acid and oleum is negligible, oleum is the preferred reagent. Benzene is added gradually to ice-cold sulfuric acid containing 5-8% of the anhydride the reaction is complete after ten to fifteen minutes. Benzensul-fonic acid is isolated readily as the sodium salt by the addition of the reaction mixture to a saturated sodium chloride solution. The reaction of benzene with chlorosulfonic acid is not used for the preparation of benzenesulfonic acid because, under conditions that limit the formation of the sulfonyl chloride, the acid is always accompanied by phenyl sulfone. Benzenesulfonyl chloride can be obtained in a yield of 75-77% by the addition of benzene to an excess of chlorosulfonic acid (room temperature). Fluorosulfonic acid reacts less vigorously the addi-... 

Mercuric Sulfate. Mercuric s Af2iX.e.[7783-35-9] HgSO, is a colorless compound soluble ia acidic solutions, but decomposed by water to form the yellow water-iasoluble basic sulfate, HgSO 2HgO. Mercuric sulfate is prepared by reaction of a freshly prepared and washed wet filter cake of yellow mercuric oxide with sulfuric acid ia glass or glass-lined vessels. The product is used as a catalyst and with sodium chloride as an extractant of gold and silver from roasted pyrites. 

---