Hexavalent chromium and total chromium removal from polychlorinated vinyl chloride (PVC) polymers
US8415452B1 · kind B1 · utility
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10Claims
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Key dates
| Filing date | Mar 30, 2012 |
| Grant date | Apr 9, 2013 |
| Priority date | — |
| Expiry date | Mar 30, 2032 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB01D2321/28
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
A non-destructive process for removing chromium from polyvinyl chloride filters is disclosed. The process involves immersing the polyvinyl chloride filters in a concentrated hydrogen peroxide solution at elevated temperatures, followed by rinsing with deionized water. Removing the background concentration of chromium from the filters allows for more accurate measurements of the amount of hexavalent and total chromium present in workplace environments.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.