Method for purifying 11-cyano-undecanoic acid

Details Method for purifying 11-cyano-undecanoic acid Method for purifying 11-cyano-undecanoic acid

C - Chemistry, Metallurgy

11

B

260/534.1

C11B 3/00 (2006.01)

Patent

CA 1049554

METHOD FOR PURIFYING 11-CYANO-UNDECANOIC ACID ABSTRACT OF THE DISCLOSURE 11-cyano-undecanoic acid having a high purity of 99% or more is obtained by the steps of dissolving a crude 11-cyano- undecanoic acid in the form of free acid or its ammonium salt into a mixture solvent consisting of acetic acid or propionic acid and water in a mixing ratio by weight of 1 : 0.05 to 3; bringing a refining gas containing therein ozone into contact with said solution in order to decompose impurities, especially, coloring substances in said solution, and; crystallizing and separating the purified 11-cyano-undecanoic acid from said solution. - 1 -

218607

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