METHOD FOR SEPARATING SUGAR AND ALCOHOL

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PROBLEM TO BE SOLVED : To provide a method for separating solutions, respectively containing rare sugar alcohols of high purity in a high recovery ratio from a raw solution containing two kinds of sugar alcohols by operation using a pseudo moving layer under a specific condition, noticing the characteristics or functionalities of rare sugar alcohols, such as allitol, tritol, sorbital, iditol, or the like. SOLUTION : In a method for chromatographically separating sugar alcohols into respective fractions, from a raw solution containing two kinds of sugar alcohols using water as the eluent, a plurality of filling columns which are filled with a calcium type cation exchange resin as an adsorbent, having a selective adsorption capability with respect to the sugar alcohols, are endlessly connected in series, to form a circulation system; and the raw solution of which the sugar alcohol concentration is 20% or higher and the eluent are supplied to the circulation system. The circulation system is divided into four zones; the respective liquid supply parts and respective fraction-withdrawing parts are successively transferred to the downstream side in the circulating direction, while holding a predetermined positional relation to form a pseudo-moving layer of the adsorbent; and the circulating solution is chromatographically separated into respective sugar alcohol fractions. COPYRIGHT : (C)2009, JPO&INPIT