US 5,071,547 AGranted

Column chromatographic column apparatus with switching capability

AssigneeSeparations Technology, Inc.

InventorsFrederick D. Cazer, Barry L. Scott, Garth E. Strobel

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Abstract

The present invention involves a dual column chromatographic apparatus with column switching capability that is useful in any pressurized fluid chromatography system. The apparatus has at least a first and second chromatographic column, a detector, a fluid conveyance system having a multivalve arrangement, pressurizable fluid conduit assembly, and a controller. The columns are adapted for containing stationary phase or packing for separation of a multicomponent sample into one or more components. The multi-valve arrangement has a plurality of multi-port, multi-modal valves and can include an ingress-egress valve; a guard pre-column valve; detector isolation valve; a set of four, four-port, multi-modal valves; or a set of two four-port, multi-modal valves and one six-port, multi-modal valve or a first valve set and a second valve set. The two chromatographic columns, multi-valve arrangement, and detector are linked for pressurized fluid communication by the pressurized fluid conduit assembly. This conduit assembly with pressurization enables the passage of the fluid mobile phase with or without a sample into the multivalve arrangement, between the valves of the multi-valve arrangement, from and to the multi-valve arrangement and the first column, from and to the multi-valve arrangement and the detector, from and to the multi-valve arrangement and the second column, and out of the multi-valve arrangement. An electronic, pneumatic, or hydraulic controller is connected for actuating action with the valves in the multi-valve arrangement to change one or more of the valves from one state of pathways to another state of pathways.

Claims28

Dependent claims

A dual chromatographic column apparratus with multiple valves for column switching useful with pressurized fluid cnromatography devices, comprising:

(a) a first and second chromatographic column having two ends, where each column is adapted for:
(i) holding a charge of a solid stationary phase, (ii) operating under superatmospheric pressures, (iii) receiving mobile phase with or without a multi-constituent sample at one end, (iv) exiting at the other end mobile phase without or with sample which has at least one cnstituent eluting differently from the rest of the sample, and (v) backflushing with mobile phase;
(b) a detector adapted to receive mobile phase with or without sample from either or both of the columns sequentially or from a mobile phase reservoir through pressurized fluid communication with the columns or reservoir,
(c) a fluid conveyance system having:
(1) multi-valve arrangement, where each valve is adapted for actuation so the arrangement can be adapted for pressurized fluid communication with the columus and the detector to provide
(i) for passage of the mobile phase with or without sample into the dual chromatographic column apparatus rather than by-passing this apparatus and for a forward flow mode with the capability for:
selection of at least one column for flow with the detector, re-direction to the other column in at least one direction after passage through the detector, and recycling for up to both columns and, (ii) for passage of mobile phase in a backflushing mode with the capability for backflushing at least both columns sequentially and each separately;
(2) fluid conduit assembly to provide pressurized fluid communication between the valves of the multi-valve arrangement, the two chromatographic columns and the detector sequentially in series as follows:
into the multivalve arrangement ,from and to the multi-valve arrangement and the first column, from and to the multi-valve arrangement and the detector, from and to the multi-valve arrangement and the second column, and out of the multi-valve arrangement and between the valves in the multi-valve arrangement to accomplish such communication;
(3) controller in communicative relation with the actuators of each valve in the multivalve arrangement to at least transmit a signal to one or more of the valves at various times to establish at least the (i) pressurized fluid communication for mobile phase witn or without sample into the multi-valve arrangement, (ii) sequence of column selection and redirection in the forward flow and backflush modes to provide for the configuration changes to the dual column apparatus, and (iii) pressurized fluid communication for at least mobile phase with or without sample or constituents of the sample for collection or for waste.

7 more elements

A dual chromatographic column apparatus with multiple valves for column switching useful with pressurized fluid chromatography devices having at least one pump for pressurized flow of fluid and multi-constituent sample, sample injection means for the multi-constituent sample, at least one fluid phase carrier reservoir, and a controller for controlling the pressure and fluid flow in the chromatography device, comprising:

(a) a first and second chromatographic column having two ends, where each column is adapted for:
(i) holding a charge of a solid stationary phase, (ii) operating under superatmospheric pressures, (iii) receiving mobile phase with or witnout a multi-constituent sample at one end, (iv) exiting at the other end mobile phase without or with sample having at least one constituent eluting differently form the rest of the sample, and (v) backflushing with mobile phase;
(b) a detector adapted to receive mobile phase with or without sample from either or both, in series, of the columns or from a mobile phase reservoir through pressurized fluid communication with the columns or reservoir,
(c) a fluid conveyance system having:
(1) multi-valve arrangement, where each valve is adapted for actuation so the arrangement can be adapted for pressurized fluid communication with the columns and the detector, wherein the multi-valve arrangement is comprised of:
(a) a first set of more than one valve adapted for pressurized fluid communication in a forward mode for receipt of mobile phase with or without sample from the ingress egress valve and for the capability of pressurized fluid communication of the mobile phase with or without sample to substantially all of the following:
(i) by selection to one of the columns, (ii) by redirection to one end of at least one other column upon receipt from the first column from a second set of more than one valve, and (iii) by exiting from the apparatus the delivery of the mobile phase with or without at least portions of sample to collection or waste;
adapted for allowing for backflushing of at least one column;
and adapted for pressurized fluid communication in a forward ann backflushing mode for mobile phase with or without sample with a second set of more than one valve;
(b) a second set of more than one valve adapted for pressurized fluid communication of mobile phase with of without a sample to the first valve set in both a forward and backflushing mode and for redirection to one column from the other column or the detector, wherein the detector is connected through the fluid conduit assembly by two connections for ingress and egress of fluid flow from the second valve set but isolated from the pressure of the apparatus;
and wherein the detector has two connections through the fluid conduit assembly to the second multi-valve arrangement where one connection allows for ingress and the other for egress from the detector and the fluid flow through the detector is in one direction, wherein the fluid conduit assembly provides pressurized communication between the valves in conjunction with the controller that communicates with the actuators of the valves in both the first and second valve sets;
so that, the multi-valve arrangement provides:
for passage of the mobile phase with or without sample into the dual chromatographic column apparatus rather than by-passing this apparatus and for a forward flow mode with the capability for;
selection of at least one column for flow with the detector, re-direction to the other column in at least one direction after passage through the detector including re-direction to one or both columns sequentially, where this latter communication is accomplished from at least one connection between the first and the second valve sets and the second valve set is connected with the other end of the column that is cornnected with the first valve set to re-direct the fluid from the one column to the other column, and recycling for up to both columns and, ii)for passage of mobile phase in a backflushing mode with the capability for backflushing at least both columns sequentially, and, wherein each column has one connection through the fluid conduit assembly to each of the multi-valve arrangements;
(c) an ingress and egress valve connected to the fluid conduit assembly to by-pass the apparatus in one state of the valve and to convey fluid phase with or without multi-component sample to a port in one of the valves in the first valve set and from a port in another valve in the same valve arrangement.
(2) fluid conduit assembly t provide pressurized fluid communication between the valves of the multi-valve arrangement, the two chromatographic columns and the detector sequentially in series as follows:
into the multivalve arrangement, from and to the multi-valve arrangement and the first column, from and to the multi-valve arrangement and the detector, from and to the multi-valve arrangement and the second column, and out of the multi-valve arrangement and between the valves in the multi-valve arrangement to accomplish such communication;
(3) programmable controller means that can be at least a part of the controller for the chromatographic device and that is in communicative relation with the actuators of each valve in the multivalve arrangement to be capable of at least transmitting a signal to the actuators of each valve in the multivalve arrangement to establish through actuating one or more valves at various times at least the (i) pressurized fluid communication for mobile phase witn or without sample into the multi-valve arrangement, (ii) sequence of column selection and redirection in the forward flow and backflush modes to provide for the configuration changes to the dual column apparatus, and (iii) pressurized fluid communication for at least mobile phase with or without sample or constituents of the sample for collection or for waste.

15 more elements

A dual chromatographic column apparatus with a plurality of valves having column switching capability for a pressurized fluid chromatography system comprising:

(a) a first and second tubular column each adapted for holding a charge of solid stationary phase and for operation at superatmospheric pressures,
(b) at least one detector adapted for analysis of multi-constituent sample that has constituents separated by elution through at least one column,
(c) a multi-modal valve with an actuator to deliver through one mode fluid mobile phase with or without multi-constituent sample to the apparatus and to receive from the apparatus fluid mobile phase with or without sample having some separated constituents, where the mobile phase is delivered to the apparatus in a forward flow or backflush mode;
(d) at least 4 valves that are at least bimodal with each having at least four ports and an actuator to change the valve state from one mode to another to accomplish at least the switching of the passage of fluid under pressure from a by-pass mode to an inlet mode into the apparatus to the first column to detector, the second column to detector, the first to second column to detector, the second column to first column to detector, the first column to detector to the second column, and for backflushing the first column, the second column to the first column, the first column to the second column, the detector to the second column, the detector to the first column to the second column, and the detector to the second column to the first column,
(e) a fluid conduit assembly to provide for passage of a fluid under pressure from an ingress-egress valve to one or both columns and the detector in the aforementioned modes of operation, where the valves can be switched by actuators to change the configuration of the fluid flow path between the columns and the detector,
wherein each of the four valves are connected to the dual column and the detector and the ingress-egress valve through the fluid conduit assembly as follows;
(1) a first four-port, bimodal valve has ports connected to:
the ingress-egress valve and switched between:
one of the dual columns, a second valve, with another valve other than the second valve switched to the converse;
(2) a second valve has ports connected to:
the ingress-egress valve at a port other than that to which the first valve is connected switched between:
the first valve, and another of the four four-port, bimodal valves different from that to which the first valve is connected, with the other column switched to the converse;
(3) a third valve has ports connected to and switched between:
the first valve at the same port by which the first valve is connected to the valve other than the second valve, a column at an end other than that to which the first or second valve is connected, a port on the detector, and to a port on the fourth valve;
(4) a fourth valve has ports connected to and switched between:
the third valve at the same port by which the third valve is connected to the fourth valve, the other column at the other end to which the first or seond valve is connected, another port on the detector, and the second valve at the port by which the second valve is connected to the valve that is other than the first valve, and
wherein the third valve is connected to the other end of the column that is connected at the other end of that same column to the valve to which the third valve lacks a connection, and wherein the fourth valve is connected to the other end of the other column, which has a connection at the other end of that same column to the valve other than the ingress-egress valve to which the fourth valve lacks a connection;
and
(f) controller for generating process signals and for transmitting, and receiving signals to and from the actuators of each valve in the multivalve arrangement to establish at least the (i) pressurized fluid communication for mooile phase with or without multi-component sample into the multi-valve arrangement, (ii) sequence of column selection and redirection in the forward flow and backflush modes to provide for the configuration changes to the dual column apparatus, and (iii) pressurized fluid communication for at least mobile phase with or without sample or constituents of the sample for collection or for waste;
and
(g) a guard chromatographic column having a charge of stationary phase to separate any column contaminants from the multi-component sample, and operating under superatmospneric pressures, and connected for pressurized fluid communication witn the fluid conveyance system through the multi-valve arrangement prior to the first and second chromatographic columns and loaded or backflushed independently1 and
(h) a multi-position multi-modal valve connecting or disconnecting the guard column with the fluid conveyance system through the fluid conduit assembly through which one port of the valve is connected to receive under pressure fluid mobile phase with or without multicomponent sample and through which another port is connected to deliver the same matarial received by the valve to the guard column and through which another port is connected to receive the mobile phase without sample or with multi-component sample having some components eluting from the column at different intervals, and through which another port of the valve delivers the same material received from the guard column to a port in one of the valves of the first multi-valve arrangement;
and
(i) a multi-position, multi-modal valve in the second multi-valve arrangement to isolate the detector from the superatmospheric pressure of the apparatus, and
(j) at least one pump for supplying at least one mobile phase to the ingress-egress valve and the dual column chromatographic apparatus;
and
(k) at least one collection device to receive material from the dual chromatographic column system;
and.
(1) a sample injector before the ingress-egress valve;
and
(m) a plurality of mobile phase reservoirs and a mixing chamber to provide for gradient elution in the chromatographic system.

28 more elements

Dependencies are inferred from the claim text.