Process for lightening the color of polyol esters
AssigneeOxea GmbH
InventorsGuido D. Frey, Thorsten Kreickmann, Heinz Strutz
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Abstract
The present invention relates to a process for lightening the color of polyol esters by reacting polyols with linear or branched aliphatic monocarboxylic acids having 3 to 20 carbon atoms, wherein the reaction product is worked up without using adsorbents and comprises a treatment with ozone or ozone-containing gases and an immediately subsequent steam treatment with subsequent drying.
Claims33
Process for lightening the color of polyol esters by reacting polyols with linear or branched aliphatic monocarboxylic acids having 3 to 20 carbon atoms and then working up the reaction mixture without the use of adsorbents, characterized in that removal of unconverted starting compounds is followed by treating the reaction product with ozone or ozone-containing gases in an amount of 0.01 to 5.0 grams of ozone per liter of polyol ester, immediately thereafter performing a steam treatment without further intermediate steps and drying the remaining polyol ester.
Dependencies are inferred from the claim text.