Method for analyzing impurities in carbon dioxide
US7064834B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jan 22, 2003 |
| Grant date | Jun 20, 2006 |
| Priority date | — |
| Expiry date | Jan 10, 2024 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N2001/2282
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
This invention relates to methods and systems for detecting contaminants that can precipitate and deposit on a workpiece during a carbon dioxide application, especially contaminants that are already present and dissolved in the fresh carbon dioxide fed to the application. One aspect of this invention includes a method of detecting contaminants dissolved in a carbon dioxide stream, including the steps of sampling at least a portion of the carbon dioxide stream to form a carbon dioxide sample; modifying at least one physical condition of the carbon dioxide sample to form an aerosol that includes gaseous carbon dioxide and at least one suspended contaminant; and detecting the number of particles of suspended contaminant in at least a portion of the carbon dioxide sample with at least one particle counter. A system for continuously detecting contaminants dissolved in a carbon dioxide stream is also described.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.