acid refining

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• Acid-free paper — is paper that has a neutral or basic pH (7 or slightly greater). It addresses the problem of preserving documents for long periods. Overview Paper made from wood based pulp that has not had its lignin removed goes yellow and deteriorates over… …   Wikipedia

• acid rain — precipitation, as rain, snow, or sleet, containing relatively high concentrations of acid forming chemicals, as the pollutants from coal smoke, chemical manufacturing, and smelting, that have been released into the atmosphere and combined with… …   Universalium

• acid heat test — noun : a test used in petroleum refining for indicating the amount of unsaturated hydrocarbons in gasoline and performed by noting the increase in temperature caused by adding one volume of 93 percent sulfuric acid to five volumes of gasoline in… …   Useful english dictionary

• petroleum refining — Introduction  conversion of crude oil into useful products. History Distillation of kerosene and naphtha       The refining of crude petroleum owes its origin to the successful drilling of the first oil well in Titusville, Pa., in 1859. Prior to… …   Universalium

• Naphthenic acid — Example of a naphthenic acid Naphthenic acid (CAS: 1338 24 5 ) is the name for an unspecific mixture of several cyclopentyl and cyclohexyl carboxylic acids with molecular weight of 120 to well over 700 atomic mass units. The …   Wikipedia

• sulfuric acid — Chem. a clear, colorless to brownish, dense, oily, corrosive, water miscible liquid, H2SO4, usually produced from sulfur dioxide: used chiefly in the manufacture of fertilizers, chemicals, explosives, and dyestuffs and in petroleum refining. Also …   Universalium

• Sulfuric acid — Sulfuric acid …   Wikipedia

• Precious metals refining — Precious metal refining is a superordinate term for the separation from noble metalliferous materials. The precious metals are won for example from used catalysts, electronics, ores or alloys. The refining is a very expensive and complex… …   Wikipedia

• Hexafluorosilicic acid — Preferred IUPAC name Hexafluorosilicic acid Systematic name …   Wikipedia

• Chloroauric acid — Other names …   Wikipedia

• Fuming sulphuric acid — Sulphuric Sul*phu ric, a. [Cf. F. sulfurique.] 1. Of or pertaining to sulphur; as, a sulphuric smell. [1913 Webster] 2. (Chem.) Derived from, or containing, sulphur; specifically, designating those compounds in which the element has a higher… …   The Collaborative International Dictionary of English