Recovery of glycols from used glycol-containing technical...

Details Recovery of glycols from used glycol-containing technical... Recovery of glycols from used glycol-containing technical...

C - Chemistry, Metallurgy

07

C

C07C 31/20 (2006.01) C07C 29/82 (2006.01) C07C 41/42 (2006.01) C07C 43/11 (2006.01) C09K 5/00 (2006.01)

Patent

CA 2150392

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.

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