| http://www.w3.org/ns/prov#value | - Highly basic calcium sulphonates are generally produced by carbonating an oil solution of a sulphonic acid, a reaction solvent, a stoichiometric excess (over that required to react with the sulphonic acid) of a calcium compound, usually calcium oxide or calcium hydroxide and certain reaction promoters such as lower alcohols, especially methanol and/or calcium chloride.
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