Abstract: A mobile phase collection device for increasing the total collectible volume of a liquid fraction that is collected in supercritical fluid chromatography or liquid chromatography includes a collection vessel assembly that is suitable for increasing the total collectable volume of a liquid phase fraction while using a relatively smaller collection vessel. A vessel extender is attached to an attachment end of a relatively smaller collection vessel, resulting in the ability to increase the total volumetric size of a collection vessel. The extended vessel assembly can be used throughout an entire purification and dry down process.

Abstract: The invention relates to a system for sample fi-action collection in chromatography, and more specifically for using an extended vessel assembly that increases the total collectible volume of a liquid sample fraction in a single collection vessel in an automated system for collection, purification, and storage of purified sample fractions. The system uses an extended vessel assembly to provide collection of substantially large volumes of liquid fractions from chromatography system, such as a preparatory scale supercritical fluid chromatography (Prep Scale SFC) or preparatory scale liquid chromatography (Prep Scale LC), into a single collection vessel. The invention improves productivity while reducing the need for sample transfer between vessels and reducing the risk of human error. The collected liquid solvent is removed after purification using one of several types of evaporation devices or techniques, such as evaporation at moderate temperature under a vacuum with liquid agitation.

Abstract: A method and apparatus for converting a pump for use in a flow stream containing a mixture of highly compressed gas, compressible liquid or supercritical fluid wherein the pump delivers a compressible fluid against a back-pressure regulator which in turn delivers a controllable flow rate downstream of the regulator without performing variable compressibility compensation adjustments on the pump. By using a pressurized source of compressible fluid combined with isocratic conditions, the delivery pressure from the pump is controlled at a rate higher than the downstream gradient with the back-pressure regulator, and an inexpensive pump may be used in place of specialized, expensive pumps and compressibility compensation systems for use in stems operating at or near supercritical fluid levels of compressible fluids. Significant capital and operating laboratory costs are saved through a simpler and cheaper system for accurately delivering compressible fluids into mobile phase flow streams.

Abstract: A fractionated sample collection process and device having at least one pressurized chamber used to gather and store liquid samples generated from a flow stream containing a mixture of highly compressed gas, compressible liquid, or supercritical fluid and a relatively incompressible liquid. A bank of multiple collection chambers is secured together in a frame to form a cassette unit. Each collection chamber may house a replaceable liner such as a test tube vial, to hold a fractionated liquid phase sample. After filling with sample, a collection chamber is returned to a clean state and ready for refilling with a new sample by manually or automatically replacing the liner.

Abstract: A fractionated sample collection process and device having at least one pressurized chamber used to gather and store liquid samples generated from a flow stream containing a mixture of highly compressed gas, compressible liquid, or supercritical fluid and a relatively incompressible liquid. A bank of multiple collection chambers is secured together in a frame to form a cassette unit. Each collection chamber may house a replaceable liner such as a test tube vial, to hold a fractionated liquid phase sample. After filling with sample, a collection chamber is returned to a clean state and ready for refilling with a new sample by manually or automatically replacing the liner.

Abstract: A corona treating apparatus has an electrically conductive electrode housing with a downwardly opening channel, within which are adjustably positioned a number of conductive electrode segments. Each segment has a stem which extends into the channel, and a foot which extends below the channel and which overlies an electrically conductive electrode roller, over which the material to be treated travels. Top springs extend into bores in the top of the electrode segments, and ball detents extend through the housing to urge against slots on one side of the segments. Each electrode segment stem has a first lip which engages with an upper ledge when the segment is in a retracted position, and a second lip which engages with a lower ledge on the opposite wall when the segment is in an active position. Pushing upwardly on one sideward flange of an electrode foot readily changes the position of each segment.

Abstract: Apparatus and method are provided for controlling at least one physicochemical property of carrier fluids and/or support fluids provided to chromatographic detectors by determining a physicochemical property of the one or both fluids and controlling that property using interactive feedback loops.

Abstract: A system and method are shown for performing cool, on-column sample injection into a chromatographic device having a capillary column which injection is achieved through the use of a syringe having a needle. The column diameter is minimized by the provision of an inlet assembly connected to the inlet end of the column, a sealing member disposed in the inlet assembly, for forming a fluid tight seal in the inlet end when the sample is injected onto the column to prevent the sample from escaping and for reducing the effective length of the needle at the point of insertion of the needle into the column and a guide member for reducing the effective length and for supporting the needle during insertion into the column. A temperature controller for controlling the temperature of the column in the region where the sample is injected is also disclosed. The sealing member is shown to include an elastomeric member and further the system includes a mechanism for continuously cooling the elastomeric member.

Abstract: Apparatus and methods are disclosed for performing a chromatographic separation of a given compound utilizing programmed temperature and mass flow wherein the compound is injected into a pressurized carrier gas and passed through a column and wherein a portion of the column is subjected to a temperature profile, by determining the pressure of the carrier gas and generating a pressure information signal representative of such pressure, storing desired carrier gas mass flow information and temperature profile information, and controlling the pressure of the carrier gas in response to the mass flow information, the temperature profile information and the pressure information signal, so that as the temperature profile information changes with time, the desired mass flow of carrier gas at a corresponding time is maintained by controlling the pressure of the carrier gas.

Abstract: Apparatus and methods are disclosed for performing a chromatographic separation of a given compound wherein the compound and a carrier gas are passed through an injection port and onto a column and wherein a portion of the column is contained in an oven. The apparatus and method are shown to include a first heater for heating the injection port in response to a first control signal, a first temperature sensor for sensing the temperature of the injection port and for generating a first temperature signal representative of the temperature of the injection port, a second heater for heating the oven in response to a second control signal, a second temperature sensor for sensing the temperature of the oven and for generating a second temperature signal representative of the temperature of the oven and a cooling member for simultaneously cooling the injection port and the column. The cooling member can include various conduit arrangements for directing a flow of cryogen fluid.