Method of analysis by liquid-phase chromatography
US4003243A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 15, 1975 |
| Grant date | Jan 18, 1977 |
| Priority date | — |
| Expiry date | Jul 15, 1995 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N30/461
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
This invention concerns a method of analysis by liquid-phase chromatography with programmed elution gradient. According to this method, two chromatography columns, of at least approximately similar porous volume and permeability, are each fed with a mixture of two solvents, in such a way that at any point in time the concentration of one of the solvents at the inlet to the first column is the same as the concentration of the other solvent at the inlet to the second column; the substance for analysis is injected into the inlet of one of the two columns; and the fluids leaving both columns are added to each other to form a mixture for analysis in a concentration detector. The main purpose of the method is to ensure better analysis of petroleum cuts.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.