Method for preparing L-iditol

Abstract

A method for preparing high-purity L-iditol, which includes subjecting a mixture of L-iditol and L-sorbose to chromatography, thereby obtaining at least two fractions, one of which is highly enriched L-iditol. Iditol, and another of them is a fraction highly enriched in L-sorbose.

Description

technical field [0001] The invention relates to a method for preparing high-purity L-iditol. Background technique [0002] L-iditol is a sweet-tasting hexitol that could be used in the food industry if it could be produced in large quantities and at low cost, or could prove to be a synthetic intermediate in the preparation of other products, especially those that form internal anhydrides. Products such as iditan, especially intermediates of isoidide or 1,4,3,6-dianhydroiditol. [0003] Although these anhydrides have also been found to be particularly useful as penetrating agents or water retaining agents, their hydroxyl groups, especially the two -(OH) groups of isoidide, are very susceptible to etherification or esterification reactions , and become a favorable intermediate. [0004] Esterification of isoidide with monocarboxylic acids yields diesters, which can be used as plasticizers in synthetic resins. Diethers such as dimethylisoidose have proven to be excellent sol...

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Problems solved by technology

[0017] In order to solve this problem which has been posed for many years, the applicant company, in its honor, has provided a solution, having found that by performing a chromatographic separation of a mixture of L-sorbose and L-iditol on cationic resins or zeolites, it is possible to L-iditol is obtained in very high purity and fully favorable economical conditions, preferably cationic resins and it is used for the chromatographic separation of sugars such as glucose and fructose or polyols such as sorbitol and mannitol composition

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