| 摘要 |
A method for the recovery of an N-substituted cephalosporanic acid compound of general formula (I), wherein R2 is selected from the group consisting of adipyl (1,4-dicarboxybutane), succinyl, glutaryl, adipyl, pimelyl, suberyl, 2-carboxyethyithio)acetyl, 3-carboxyethylthio)propionyl, higher alkyl saturated and higher alkyl unsaturated dicarboxylic acids, from a complex mixture comprising in addition to the compound of general formula (I) 6-aminopenicillanic acid (6-APA) and optionally one or more N-substituted penicillanic acid compounds, comprising the steps of: (a) acidifying the complex mixture to a pH below 6.5 and maintaining the mixture below said pH at a temperature of between 10° C. and 150° C.; and/or (b) contacting the complex mixture with a carbon dioxide source; and (c) recovering the cephalosporanic acid compound of formula (I) from the mixture obtained after steps (a) and/or (b).
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