RECOVERY OF GLYCOLS FROM USED GLYCOL-CONTAINING TECHNICAL FLUIDS

A novel process for recovering glycols from used glycol-containing technical fluids is disclosed. Used glycol-containing technical fluids has added to it an organic solvent which forms with the glycols to be separated off, an azeotropic mixture which has a lower boiling point than the glycol itself....

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Bibliographische Detailangaben
Hauptverfasser:	MOHR, JUERGEN, BALZER, WOLF-DIETER
Format:	Patent
Sprache:	eng ; fre
Schlagworte:	ACYCLIC OR CARBOCYCLIC COMPOUNDS ADHESIVES CHEMISTRY DYES MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FORELSEWHERE METALLURGY MISCELLANEOUS APPLICATIONS OF MATERIALS MISCELLANEOUS COMPOSITIONS NATURAL RESINS ORGANIC CHEMISTRY PAINTS POLISHES
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Beschreibung
Zusammenfassung:	A novel process for recovering glycols from used glycol-containing technical fluids is disclosed. Used glycol-containing technical fluids has added to it an organic solvent which forms with the glycols to be separated off, an azeotropic mixture which has a lower boiling point than the glycol itself. This azeotropic mixture is then distilled off. A typical used glycol- containing technical fluid as used is antifreeze. The preferred organic solvent is a xylene or a pseudocumene. Prior to the addition of solvent which forms the azeotropic mixture with the glycol, a water portion in the used glycol-containing technical fluid, if present, can also be advantageously first removed by distillation.