| http://www.w3.org/ns/prov#value | - The overbased materials are prepared by reacting an acidic material (typically an inorganic acid or lower carboxylic acid, preferably an acid gas such as carbon dioxide, sulfur dioxide, or sulfur trioxide, and most preferably carbon dioxide) with a mixture comprising an acidic organic compound (in this case a carboxylic acid), a reaction medium comprising at least one inert, organic solvent (miner
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