Method for removing metals from a fluid stream
AssigneeNalco Chemical Company
InventorsKristine S. Siefert, Pek L. Choo, John W. Sparapany, John H. Collins
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Abstract
A method is provided for removing metals from a fluid stream containing these metals. The method involves treating the fluid stream with a water soluble ethylene dichloride ammonia polymer having a molecular weight of from 500 to 100,000 that contains at least 5 mole percent of dithiocarbamate salt groups to form a complex with the metals. Then, the fluid stream is passed through a filtering device to remove the complexes from the fluid stream.
Claims23
A method for removing monovalent and divalent metals from a fluid stream containing these metals comprising the steps of:
- treating the fluid stream with a water soluble ethylene dichloride ammonia polymer having a molecular weight of from 500 to 100,000 that contains from 5 to 50 mole percent of dithiocarbamate salt groups to form complexes with the monovalent and divalent metals;
- and
- passing the fluid stream through a filtering device to remove the complexes from the fluid stream.
A method for removing monovalent and divalent metals from a water stream containing these metals comprising the steps of:
- treating the water stream with a water soluble ethylene dichloride ammonia polymer having a molecular weight of from 500 to 100,000 that contains from 5 to 50 mole percent of dithiocarbamate salt groups to form complexes with the monovalent and divalent metals;
- allowing at least a portion of the complexes to settle from the water as a precipitate;
- and
- passing the water stream through a filter.
A method for removing monovalent and divalent metals from a water stream comprising the steps of:
- adding to the water stream a water soluble ethylene dichloride ammonia polymer having a molecular weight of from 500 to 100,000 that contains at least 5 mole percent of dithiocarbamate salt groups;
- allowing at least some of the monovalent and divalent metals located within the water stream to form complexes with the monovalent and divalent metals;
- and
- passing the water stream through a filtering device that prevents the complexes from passing therethrough, thereby removing the complexes from the water stream.
Dependencies are inferred from the claim text.