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US 4,286,457 AGranted
Viscosity measurement
AssigneeShell Oil Company
InventorHenry W. Johnson, Jr.
Life of this patent
Estimating the term…
Abstract
A method and apparatus for determining the solution viscosity of polymers using gel partition chromatography (GPC). The method comprises obtaining a GPC analysis of the solution and measuring the pressure drop at a selected point in the GPC flow path. The GPC analysis provides a measure of the polymer concentration in the solution. The viscosity can be determined from the pressure drop in combination with the known polymer concentration.
Claims4
A method for determining the solution viscosity of a polymer comprising:
- performing a gel partition chromatography analysis of the polymer solution;
- measuring the pressure drop in the flow line to the chromatography column caused by the passage of said polymer solution;
- and,
- recording both said analysis and pressure drop in a correlatable manner.
1 more element
An apparatus for determining the solution viscosity of a polymer comprising:
- a chromatography apparatus including means for supplying a solvent stream for diluting a sample of the polymer,
- means disposed in said solvent stream to control the flow of said solvent at a constant temperature;
- sample means for supplying a sample of the diluted polymer to the chromatography column;
- a discharge line for discharging the portion of said solvent and diluted polymer not used as a sample;
- a capillary disposed in said discharge line to regulate the flow therein;
- and,
- a pressure transducer disposed in said discharge line upstream of said capillary to measure the pressure therein.
4 more elements
Dependencies are inferred from the claim text.