Method For Recovering a Basic Amino Acid Form a Fermentation Liquor ll
The invention relates to a method for recovering a basic amino acid from the fermentation liquor of a micro-organism strain that produces the basic amino acid. According to said method: a) the fermentation liquor is acidified with an acid, whose pKs value in water at 25° C. ranges between 2 and 5; and b) the basic amino acid is separated from the aqueous liquor obtained in step a) by the successive charging of a single or multiple stage, serial arrangement of a strongly acidic cation exchanger in the form of a salt with the liquor that has been obtained in step a) and the subsequent elution of the basic amino acid using a basic eluant.
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10 . A method for producing a basic amino acid from the fermentation broth of a microorganism strain producing the basic amino acid, the method comprising:
a) acidifying the fermentation broth using an acid, the pKa of which in water at 25° C. is in the range from 2 to 5, and
b) separating the basic amino acid from the aqueous broth obtained in step a) by loading the broth obtained in step a) onto a single-stage or multistage serial arrangement of a strongly acidic cation exchanger in its salt form, and eluting the basic amino acid with a basic eluent;
wherein microorganisms and other solid constituents present in the fermentation broth are not separated before the loading of the single-stage or multistage serial arrangement of the strongly acidic cation exchanger.
11 . The method according to claim 10 , wherein the acid is selected from the group consisting of organic carboxylic acids and hydroxycarboxylic acids.
12 . The method according to claim 11 , wherein the acid is formic acid.
13 . The method according to claim 10 , wherein from about 0.05 to 2 mol of acid per kg of fermentation broth is used for the acidification.
14 . The method according to claim 10 , wherein the fermentation broth is acidified to a pH from about 3.5 to 6.0.
15 . The method according to claim 10 , wherein the acid groups of the ion exchanger before the loading are present in a form selected from the group consisting of sodium and ammonium salt groups.
16 . The method according to claim 10 , wherein the basic amino acid is eluted with aqueous ammonia or sodium hydroxide solution or a mixture thereof.
17 . The method according to claim 10 , wherein the basic amino acid is lysine.
18 . The method according to claim 10 , additionally comprising the isolation of the basic amino acid by crystallization from the eluate.