| 摘要 |
PURPOSE:To recover esters, such as food additives, with nontoxic reagents at a low cost, by liquefying a fermentation gas generated by alcoholic fermentation, passing the resultant liquid through an adsorbent to adsorb the esters, passing an aqueous solution of ethanol in the opposite direction and eluting the adsorbed substance. CONSTITUTION:A fermentation gas generated by alcoholic fermentation is liquefied and recovered. The obtained liquid is then passed through an adsorbent filled in a column to adsorb esters thereon. An aqueous solution of ethanol is subsequently passed in the direction opposite to the feeding direction of the liquid recovered from the liquefied fermentation gas to elute the adsorbed substance from the adsorbent. Thereby the esters are recovered. Furthermore, the adsorbent is preferably dealuminated Y-type zeolite having >=10 molar ratio (SiO2/Al2O3) or active carbon and an aqueous solution containing >=30vol.% ethanol is preferably used as the aqueous solution used for eluting the substance adsorbed on the adsorbent. |
