Method for producing 5-aminolevulinic acid hydrochloride
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United States of America Patent
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Apr 3, 2012
Grant Date -
Feb 5, 2009
app pub date -
Sep 5, 2006
filing date -
Sep 21, 2005
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Abstract
A method for producing crystals of 5-aminolevulinic acid hydrochloride wherein, in carrying out adsorption of 5-aminolevulinic acid contained in a crude 5-aminolevulinic acid solution by a cation exchange resin and its subsequent desorption with an aqueous solution containing ammonium ion, a high purity 5-aminolevulinic acid aqueous solution is obtained using a change in electric conductivity or pH of the desorption liquid as the index, and chloride ion is added to the aqueous solution which is then mixed with an organic solvent.
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