Compositions and methods of cleaning polyvinyl pyrrolidone-based hemodialysis filtration membrane assemblies
US9751049B2 · kind B2 · utility
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19Claims
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Key dates
| Filing date | Feb 16, 2015 |
| Grant date | Sep 5, 2017 |
| Priority date | — |
| Expiry date | Feb 16, 2035 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB01D2321/18
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
A method and a composition of cleaning and reprocessing a hemodialysis filtration membrane assembly that employs polyvinylpyrrolidone-containing membranes, the method comprising the step of treating the assembly with an aqueous mixture or a gas-liquid mixture comprising an inorganic base and from 100 to 1,000 ppm of a hypochlorite salt, wherein the mixture has a pH between about 12.0 and about 12.5, an oxidation reduction potential of less than 0.5 volts, a temperature of 40° to 55° C. and wherein the mole % of hypochlorous acid, HOCl, relative to the sum of hypochlorous acid plus hypochlorite anion, —OCl, is less than 0.004%.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.