Chromic sulfate

Traditionally, sodium dichromate dihydrate is mixed with 66° Bh (specific gravity = 1.84) sulfuric acid in a heavy-walled cast-iron or steel reactor. The mixture is heated externally, and the reactor is provided with a sweep agitator. Water is driven off and the hydrous bisulfate melts at about 160°C. As the temperature is slowly increased, the molten bisulfate provides an excellent heat-transfer medium for melting the chromic acid at 197°C without appreciable decomposition. As soon as the chromic acid melts, the agitator is stopped and the mixture separates into a heavy layer of molten chromic acid and a light layer of molten bisulfate. The chromic acid is tapped and flaked on water cooled roUs to produce the customary commercial form. The bisulfate contains dissolved CrO and soluble and insoluble chromic sulfates. Environmental considerations dictate purification and return of the bisulfate to the treating operation. 

Chromi-nydroxyd, n. chromic hydroxide, chro-mium(III) hydroxide, -oxyd, n. chromic oxide, chromium(III) oxide, -rhodanwasser-stoffsMure, /. chromithiocyanic acid, thio-cyanatochromic(III) acid, -salz, n. chromic salt, chromium(III) salt, -suifat, n. chromic sulfate, chromium(III) sulfate, -suifocyan-saure, /. chromithiocyanic acid, thiocyana-tochromic(III) acid, -verbindung,/. chromic compound, chromium(III) compound. 

Chromic phosphate, molecular formula, properties, and uses, 6 563t Chromic potassium oxalate, molecular formula, properties, and uses, 6 563t Chromic potassium sulfate, molecular formula, properties, and uses, 6 563t Chromic sulfate, molecular formula, properties, and uses, 6 563t Chromite, 6 468-469, 471t consumption, 6 490-491 mining and processing, 6 477-481... 

Trivalent chromium compounds (Cr )(chromic compounds) including chromic oxide (Cr203), chromic sulfate (Ct2[S04]3), chromic chloride (CrCb), chromic potassium sulfate (KCr[S04]2), and chromite ore (FeOCdCr203). 

Unlike nickel, chromium metal does not produce allergic contact dermatitis. Some patients exhibit positive patch tests to divalent chromium compounds, but these compounds are considerably less potent as sensitizers than hexavalent chromium compounds. A case of chromium (chromic) sulfate-induced asthma in a plating worker, confirmed by specific challenge testing and the presence of IgE antibodies, has been reported. ... 

Formula Cr2(S04)s MW 392.16 several hydrates are known these include the pentadecahydrate Cr2(S04)s I5H2O and the octadecahydrate Cr2(S04)3-18H20 Synonym chromic sulfate... 

The equation shows that alcohol in the form of ethanol reacts with an orange solution of potassium dichromate to produce a green solution of chromic sulfate. The source of alcohol is the suspect s breath. More alcohol produces a greater color change. The breath analyzer measures this color change and coverts this measurement into an amount of alcohol in the blood. 

Basic chromic sulfate see Chromium and chromium compounds) BCNU see Bischloroethyl nitrosourea)... 

COLORANTS FORFOOD, DRUGS, COSMETICS AND MEDICAL DEVICES] (Void) Chromic sulfate [10101-53-8]... 

Cr2(S04)3 (aq., "modified ). When heated, the purple aqueous chromic sulfate is hydrolyzed, and we have assumed that this modified solution is ([Cr2- (S04)2] (OH)2+H2S04) (aq.). Colson2 measured the heats of reaction of both hydrolyzed and normal solutions with 6NaOI4 (aq.) to obtain the difference in their heats of formation. 

Chromium metal is commercially produced in the United States by the reduction of chromite ore with carbon, aluminum, or silicon, and subsequent purification. Sodium chromate and dichromate are produced by roasting chromite ore with soda ash. Most other chromium compounds are produced from sodium chromate and dichromate (Hartford 1979 Westbrook 1979). For example, basic chromic sulfate (Cr(0H)S04), commonly used in tanning, is commercially produced by the reduction of sodium dichromate with organic compounds (e.g., molasses) in the presence of sulfuric acid or by the reduction of dichromate with sulfur dioxide. Lead chromate, commonly used as a pigment, is produced by the reaction of sodium chromate with lead nitrate or by reaction of lead monoxide with chromic acid solution (IARC 1990). 

Chromic sulfate— designated CERCLA hazardous substance under sections 311 (b)(4) of the Clean Water Act 1,000 pounds ... 

In a large lead-lined vessel, 300 grams of sublimed, still moist, anthracene (calculated on the basis of 100 per cent product) is stirred with 6 liters of water and 600 grams of sodium bichromate. The mixture is heated to 80°C. over a Fletcher burner, and 1800 grams of 50 per cent sulfuric acid is added over a period of 10 hours. Chromic-acid should always be present, and the mixture should be stirred with a wooden or glass rod. Finally, the mixture is boiled for 2 hours, replacing the water lost by evaporation. The precipitate is then filtered off and washed thoroughly. The mother liquor can be worked up to recover chrome alum or chromic sulfate. 

The highest oxide of chromiunTi, chromic oxide, is acidic, and forms chromates and dichromates. The lowest oxide, CrO, is basic, forming the chromous ion Cr" and its salts. Chromic hydroxide, Cr(OH)g, representing the intermediate oxidation state, is amphoteric. With acids it forms the salts of chromic ion, such as chromic sulfate. Cr2(S04)3 and with strong base it dissolves to form the chromite ion, Cr(OH)4. ... 

Hydroxyethyl cellulose has good tolerance for dissolved electrolytes, although it may be salted out of solution when mixed with certain salt solutions. For example, the following salt solutions will precipitate a 10% w/v solution of Cellosize WP-09 and a 2% w/v solution of Cellosize WP-4400 sodium carbonate 50% and saturated solutions of aluminum sulfate ammonium sulfate chromic sulfate disodium phosphate magnesium sulfate potassium ferrocyanide sodium sulfate sodium sulfite sodium thiosulfate and zinc sulfate. 

Calcium Phosphate 7758-87-4 Cesium Bromide 7787-69-1 Chromic Sulfate 10101-53-8... 

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