| 摘要 |
PROBLEM TO BE SOLVED: To provide a processing method of an alkali metal salt and/or an ammonium salt of an organic sulfonic acid, with which a metal ion concentration can be reduced to a level usable in fields of electronics, semiconductors, precision machining, or the like, and a production method of an organic sulfonic acid ammonium salt type surfactant in which the metal ion concentration is reduced by using the organic sulfonic acid having the reduced metal ion concentration obtained by the processing method.SOLUTION: Processing is conducted by diluting a predetermined alkali metal salt and/or ammonium salt of an organic sulfonic acid with water, and subjecting the diluted salt to an ion exchange method using a strong acid cation exchange resin such that respective metal ion concentrations of Na, K, Ca, Fe, Ni, Cr and Zn based on the organic sulfonic acid are 100 ppb or less, and respective metal ion concentrations of Mg, Al, Mn and Cu are 50 ppb or less. Further, an organic sulfonic acid ammonium salt type surfactant is produced by neutralizing the organic sulfonic acid having the reduced metal concentration, which is obtained by the processing method, by one or two or more basic compounds selected from predetermined basic compounds and organic cyclic basic compounds. |
