Method for preparing L-iditol

A technology of iditol and sorbitol, applied in the field of preparing high-purity L-iditol

Inactive Publication Date: 2006-04-26
ROQUETTE FRERES SA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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, i

Method used

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  • Method for preparing L-iditol
  • Method for preparing L-iditol

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Embodiment Construction

[0077] A mixture containing 45% L-sorbose and 55% L-iditol was chromatographed. In fact, this mixture contains very small amounts of other sugars and polyols, about 2%. Using Gluconobacter oxidans ATCC 19357 to ferment a mixture of D-sorbitol and L-iditol obtained by hydrogenation of a 40% L-sorbose solution and obtained. Hydrogenation using Raney nickel at substantially neutral pH yielded a slurry containing 0.2% residual reducing sugars and substantially equal amounts of D-sorbitol and L-iditol. After fermentation, the slurry was purified by filtration, then decolorized on carbon pellets, and finally desalted on ion exchange resins, followed by concentration to 50% solids.

[0078] as in US Patent 4,422,881 figure 2 As shown, the chromatographic unit contains 8 columns or stages, each of 200 liters, with a strong ionic resin-type sorbent in the form of calcium and of fine and uniform particle size (0.2-0.3mm) (PCR732 from Purolite) , the content of this patent is incorp...

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Abstract

A method for preparing high-purity L-iditol, which comprises subjecting a mixture of L-iditol and L-sorbose to chromatographic treatment, thus obtaining at least two fractions, one of which is highly enriched in L- iditol, and the other one 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...

Claims

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Application Information

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IPC IPC(8): C07C31/26C13B35/06C07C29/76C13B20/08
CPCA23V2002/00C07B2200/07C07C29/145C07C29/76C07D493/04C07H3/02C12P19/02C07C31/26A23V2250/63
Inventor 帕特里克·富尔特斯
Owner ROQUETTE FRERES SA
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