Is a
Patent attributes
Current Assignee
Patent Jurisdiction
Patent Number
Patent Inventor Names
Atsushi Isotani0
Date of Patent
May 15, 2007
Patent Application Number
10976822
Date Filed
November 1, 2004
Patent Primary Examiner
Patent abstract
A free organic acid can be produced efficiently at a low cost, by subjecting an ammonium salt of organic acid A such as a dicarboxylic acid, a tricarboxylic acid or an amino acid, to reactive crystallization with an acid B, such as a monocarboxylic acid, wherein organic acid A and acid B satisfy the following formula (1):pKa(A)≦pKa(B) (1)where pKa(A) and pKa(B) represent ionization indices of organic acid A and acid B, respectively, provided that when they have plural values, they represent the minimum pKa among them, to separate free organic acid A in solid form.
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