Synthesis of anhydroglycitol esters of improved colour
AssigneeAto B.V.
InventorsDaniel Stephan Van Es, Augustinus Emmanuel Frissen, Hendrikus Luitjes
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Abstract
Diesters of dianhydroglycitols can be prepared by esterification of dianhydroglycitols, anhydroglycitols and/or glycitols with alkylcarboxylic or arylcarboxylic acids in the presence of an acid catalyst, the acid catalyst being a macroporous acid ion exchange resin. If glycitols or monoanhydroglycitols are used as the starting material, the reaction temperature is initially of the order of 120° C. and after the dehydration is approximately 140° C.
Claims12
A process for the preparation of esters of (di)anhydroglycitols by esterification of dianhydroglycitols, anhydroglycitols and/or glycitols with alkylcarboxylic or arylcarboxylic acids containing 3 to 18 carbon atoms in the presence of an acid catalyst, characterised in that the acid catalyst is a macroporous acid ion exchange resin, and the molar ratio of carboxylic acid to ((di)anhydro)glycitol is selected between 2 and 5.
Dependencies are inferred from the claim text.