Application of comb-like weak base resin for concentrating succinic acid by circulating desorption

An effective and low energy consumption method was established for absorption and circulating desorption of succinic acid using a comb-like weak base polystyrene resin. The behavior of the comblike weak base resin (MKF-D30X) in adsorption and desorption of succinic acid was studied in terms of volume of desorption reagent, stages of desorption, desorption temperature and recycle desorption. MKF-D30X resin had good adsorption effect on succinic acid. And the maximum adsorption capacity could be up to 425 mg succinic acid. (g dry resin)^-1. The desorption process for 3 g resin with saturated succinic acid was divided into two stages at 50°C of each stage of 10 ml, 1.0 mol·L^-1 HCl as desorption reagent. In the first stage, the concentration of succinic acid in desorption solution could be up to 52.4 mg·ml^-1, and the concentration of succinic acid increased to 209.6% of original concentration (original concentration of 25 mg·ml^-1). Recycle desorption not only maintained high concentration of succinic acid in the first stage of desorption, but also obtained twice concentration in the second stage. On the other hand, the concentration of succinic acid in the first desorption stage, as desorption reagent, had no obvious effect on desorption of succinic acid in next stage.