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US 8,262,927 B2Granted
Process for workup of glycol-containing aircraft deicers
AssigneeClariant Finance (BVI) Limited
InventorsBernhard Kropac, Wolfgang Kerbl, Erich Gatter
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Abstract
The invention provides a process for working up glycol-containing aircraft deicers, by (1) removing the suspended impurities from the used aircraft deicer, (2) treating the product thus obtained in such a way that the thickeners present therein are no longer capable of gel formation, (3) before or after step (2) establishing a pH of >7, (4) and then fractionally distilling off the glycols.
Claims5
A method for reprocessing a used aircraft de-icing agent comprising glycol and suspended impurities, wherein the method comprises the steps of:
- (1) separating off the suspended impurities from the used aircraft de-icing agent to form a partially reprocessed used aircraft de-icing agent,
- (2) treating the partially reprocessed used aircraft de-icing agent obtained from step (1) such that any thickeners present therein are no longer capable of gel formation,
- (3) before or after step (2), adjusting to a pH>7 by adding potassium hydroxide,
- (4) followed by fractionally distilling off the glycols.
1 more element
Dependencies are inferred from the claim text.