Sulfuric acid pickling reaction

In sulfuric acid pickling, ferrous sulfate is formed from the reaction of iron oxides with sulfuric acid ... 

F-S [Ferrous sulfate] A process for removing ammonia, hydrogen sulfide, and hydrogen cyanide from coke-oven gas by scrubbing with aqueous ferrous sulfate solution obtained from steel pickling. A complex series of reactions in various parts of the absorption tower yield ammonium sulfate crystals and hydrogen sulfide (for conversion to sulfur or sulfuric acid) as the end products. Developed in Germany by F. J. Collin A.G. 

Summary Chloroform can be prepared in a unusual manner by electrolyzing a solution of pickling salt and isopropyl alcohol in the presence of a small amount of sulfuric acid and potassium dichromate using graphite or lead electrodes. The process develops low yields of chloroform, and takes considerable amounts of time, but is effective at producing small amounts of chloroform. After the initial reaction, the mixture is extracted with benzene, toluene, or xylene, and the resulting solvent extracts are then combined, and then distilled to recover the chloroform. 

Summary Anhydrous hydrogen chloride is readily prepared by reacting concentrated sulfuric acid with pickling salt. During the reaction, hydrogen chloride gas is steadily evolved. 

Procedure Simply place 50 grams (1.8 oz.) of concentrated sulfuric acid into the addition funnel, and then place 60 grams (2.1 oz.) of pickling salt, into the reaction flask. Thereafter, slowly drip the concentrated sulfuric acid onto the pickling salt. During the sulfuric acid addition, hydrogen chloride gas will be steadily evolved. Once the gas has been dried, it can be used in the manufacture of anhydrous aluminum chloride, in the preparation of hydrochloride salts, and/or the preparation of anhydrous metal chlorides. 

Sulfuric acid is used in large quantities in the pickling of steel to remove oxide coatings by dissolving them. Another large use of sulfuric acid involves its reaction with ammonia obtained in the conversion of coal to coke ... 

E223 Sodium bisulfite Sulfurous acid salt Antioxidant, preservative Allergic and skin reactions 0-0.7 Frozen prawns, potatoes, alcoholic drinks, pickles, orange juice... 

---