| 摘要 |
<p>The invention provides a process for the recovery of ascorbic acid from an aqueous feed solution containing the acid at a concentration of less then 0.7 mol/kg, including adsorbing a major portion of the ascorbic acid with a solid phase adsorbent resin selected from resins carrying a pyridine function and resins of similar or weaker basicity, separating the ascorbic acid-containing resin from residual aqueous solution, and subjecting the ascorbic acid-containing resin to a desorbing operation with a neutral solvent at a temperature of at least 20 °C higher than the termperature at which the adsorbtion is carried out, whereby there is obtained a solution of ascorbic acid in solvent in which the concentration of ascorbic acid is at least equal to its concentration in the aqueous feed solution.</p> |
