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US 5,396,003 AGranted
Recovery and purification of 1,1,2-trichloroethane for reuse in the production of ioversol
AssigneeMallinckrodt Medical PMC
InventorWilliam Z. McCarthy
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Abstract
A process for the recovery and purification of 1,1,2-trichloroethane from the intermediates produced for the production of ioversol for reuse thereof.
Claims3
A process for the recovery and purification of 1,1,2-trichloroethane from a process stream for the production of ioversol comprising the steps of:
- a) removing 1,1,2-trichloroethane from ioversol intermediates by distillation;
- b) extracting said 1,1,2-trichloroethane with an aqueous oxidizing reagent selected from the group consisting of chlorine dissolved in water, manganese oxides, oxygen and oxides of nitrogen to form water-saturated 1,1,2-trichloroethane;
- c) distilling said water-saturated 1,1,2-trichloroethane which forms an azeotrope for drying thereof to produce 1,1,2-trichloroethane;
- and
- d) distilling said 1,1,2-trichloroethane to remove high boiling point impurities.
2 more elements
Dependencies are inferred from the claim text.