Supercritical fluid chromatography
First Claim
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1. An apparatus for controlling the mass flow of a mobile phase in a chromatographic analysis system, said apparatus comprising:
- a restrictor, through which the mobile phase passes, and heater means, which transfers heat to said restrictor, for heating said mobile phase in said restrictor so that for a given mobile phase pressure the mass flow of said mobile phase is maintained at a preselected level by modifying the temperature of said mobile phase in said restrictor.
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Abstract
In a system for analyzing a chemical sample by chromatographic separation of said sample into components a method and apparatus are provided for maximizing detector resolution and minimizing duration by maintaining the linear velocity of the mobile phase at a desired level by affecting the viscosity and density characteristics of the mobile phase as it passes through a restrictor by programming the restrictor temperature.
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Citations
10 Claims
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1. An apparatus for controlling the mass flow of a mobile phase in a chromatographic analysis system, said apparatus comprising:
- a restrictor, through which the mobile phase passes, and heater means, which transfers heat to said restrictor, for heating said mobile phase in said restrictor so that for a given mobile phase pressure the mass flow of said mobile phase is maintained at a preselected level by modifying the temperature of said mobile phase in said restrictor.
- View Dependent Claims (2, 3, 4, 5)
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6. An apparatus for controlling the linear velocity of a pressurized mobile phase in a chromatographic analysis system comprising:
- a restrictor through which the mobile phase passes, and mass flow control means for controlling the mass flow of said mobile phase passing through said restrictor, so that the linear velocity of said mobile phase is controlled by controlling the mass flow of said mobile phase.
- View Dependent Claims (7)
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8. A method for controlling the mass flow of a pressurized mobile phase in a chromatographic analysis system comprising the steps of:
- passing said mobile phase through restrictor, and heating said mobile phase in said restrictor so that for a given mobile phase pressure the mass flow of said mobile phase is maintained at a preselected level by modifying the temperature of said mobile phase in said restrictor.
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9. A method for controlling the linear velocity of a pressurized mobile phase in a chromatographic analysis system comprising the steps of:
- passing the mobile phase through a restrictor, and controlling the mass flow of said mobile phase passing through said restrictor, so that the linear velocity of said mobile phase is controlled by controlling the mass flow of said mobile phase.
- View Dependent Claims (10)
Specification