IC Determination of Maleic Acid and Succinic Acid in Electrolyte from Synthesis of Succinic Acid

Contents of maleic acid (the raw material) and succinic acid (the products) in electrolyte from synthesis of succinic acid were determined by ion chromatography. Ion Pac AG19 protective column and Ion Pac AS19 separation column were used for separation and 25 mmol·L-1 KOH solution was used as eluant. Inhibitory conductivity detection was adopted in the determination. Linear relationships between values of peak area or peak height and mass concentration of maleic acid and succinic acid were kept in the range of 1.0-10 mg·L-1. The proposed method could be used in the determination of the 2 acids in the electrolyte at different time interval (at starting and ending of electrolysis) and in the mother liquid in the synthetic process. The data obtained were helpful for the realization of synthetic technology of the continuous electrolytic production of succinic acid.