Method of measuring concentration of polymerization inhibitor contained in fluorine-containing olefinic monomer and method of polymerizing fluorine-containing olefinic monomer comprising the measurement method
US5652147A · kind A · utility
8Cited by
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8Claims
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Key dates
| Filing date | Mar 20, 1996 |
| Grant date | Jul 29, 1997 |
| Priority date | — |
| Expiry date | Mar 20, 2016 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T436/255
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
There is provided a precisely quantitative measurement method of a hydrocarbonaceous polymerization inhibitor component in a fluorine-containing olefinic monomer, which inhibitor component is contained in the monomer in such a trace amount that it cannot be detected by a gas chromatography. In the method, an ultraviolet absorption spectrum of a concentrated sulfuric acid is measured after it is contacted with the fluorine-containing olefinic monomer and the concentration of the polymerization inhibitor is obtained based on an absorbance of the spectrum and a calibration curve which has been beforehand obtained.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.