Add time:08/18/2019         Source:sciencedirect.com

The separation of glycolic acid (GA) from Glycolonitrile (cas 107-16-4) hydrolysate by using adsorption resins (HPD 950, HPD450, and AB-8) was studied, and the adsorption kinetics and the dynamic adsorption and the dynamic desorption were investigated systematically. The results indicated that a higher quality of GA solution could be obtained by collecting effluents at specific time range due to the different affinity of substances to resins. The internal diffusion inside resin was found to be the controlling step of the adsorption separation process of GA. The adsorption rate increased with increases in GA concentration and temperature but decreased with increase in the resin diameter. The rate constant of adsorption, the apparent reaction order, and the apparent activation energy were determined by analyzing the transfer process of GA from the liquid to the active adsorption site. The desorption rate and the purification rate of GA increased with increases in temperature and ethanol concentration, and the purification rate of GA increased with increase in the flow rate within a specific range. HPD950 had a remarkable advantage of adsorption separation of GA.

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