The Basic sodium sulfate is often left in the technical product since it is inert with respect to the tanning process.īasic chromium sulfate is important to fully reduce the hexavalent chromium to trivalent since the hexavalent is more likely to cause health problems for tanners and leather consumers.īasic chromium sulfate is an inorganic compound with the chemical formula Cr(OH)(SO4).īasic chromium sulfate is a green, odorless solid at room temperature.īasic chromium sulfate is typically sold in powder form.īasic chromium sulfate has high tanning power and hence largely used in the tanning of leather.īasic chromium sulfate is easily soluble in cold water and very soluble in hot water.Ĭhromium, particularly in the hexavalent oxidation state, is toxic, hence basic chromium sulfate, which is comparatively less toxic, is preferred in the leather industry.īasic Chromium Sulphate are the mixture of various form of Chromium Sulphates including containing Chromium Hyrdoxide sulphate form chiefly.īasic chromium sulfate is prepared by the reduction of Sodium Dichromate Solution in the presence of Sulphuric Acid or Sulfur dioxide. 42% or 50% may be obtained by the addition of sodium carbonate, these are often used in combination with sodium formate. Since 33% of the anion charges are due to hydroxy ions the basicity is 33% (but in tanning jargon it is known as 33% reduced). It was also used in gelatine emulsions in photographic film as hardener.Basic Chromium Sulphate is used in dyeing of khaki cloth and in manufacture of chrome-based dyestuffs.īasic chromium sulfate is produced from chromate salts by reduction with sulfur dioxide, although other methods exist. However, this application is obsolete because the simpler chromium(III) sulfate is preferred. Uses Ĭhromium alum is used in the tanning of leather as chromium(III) stabilizes the leather by cross linking the collagen fibers within the leather. In addition to the dodecahydrate, the hexahydrate KCr(SO 4) 2♶H 2O, dihydrate KCr(SO 4) 2♲H 2O, and the monohydrate KCr(SO 4) 2 ![]() Aqueous solutions are dark violet and turns green when it is heated above 50 ☌. ![]() The solution reddens litmus and is an astringent. Chromium alum crystallizes in regular octahedra with flattened corners and is very soluble in water. Alternatively and less commonly, ferrochromium alloys can be dissolved in sulfuric acid and, after precipitation of the ferrous sulfate, the chrome alum crystallizes upon addition of potassium sulfate. Concentrated aqueous solutions of potassium dichromate can be reduced, usually with sulfur dioxide but also with alcohols or formaldehyde, in the presence of sulfuric acid at temperatures <40 ☌. Production and properties Chrome alumĬhromium alum is produced from chromate salts or from ferrochromium alloys. ![]() Its chemical formula is KCr(SO 4) 2 and it is commonly found in its dodecahydrate form as KCr(SO 4) 2♱2(H 2O). Chrome alum or Chromium(III) potassium sulfate is the potassium double sulfate of chromium.
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