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US 4,500,430 AGranted
Continuously rejuvenated ion exchanger
OwnerPurnendu K. Dasguptainventor
Life of this patent
Estimating the term…
Abstract
An apparatus for ion exchange which comprises (1) a very small diameter helix shaped inner tube of a suitable ion exchanging material having a filament therein and having its terminal ends inserted into entry and exit tubes, and (2) a diametrically slightly larger and longer length hollow outer tube having (a) the helix enclosed therein; (b) inlet and outlet apertures; and (c) sealed ends around the entry and exit tubes leading to the helix, and the method of making and using the same.
Claims51
An apparatus for ion exchange which comprises:
- (a) an inner tube of an ion exchanging material having:
- (1) a length of approximately 50 to 200 centimeters;
- (2) a helical configuration with a diameter of less than 10 millimeters;
- and
- (3) its terminal ends inserted into entry and exit tubes;
- and
- (b) a filament within the helix;
- and
- (c) a hollow outer tube having:
- (1) a larger diameter and longer length than the helix;
- (2) the helix enclosed therein;
- (3) inlet and outlet apertures;
- and
- (4) sealed ends around the entry and exit tubes leading to the helix.
11 more elements
An apparatus for ion exchange which comprises:
- (a) an inner tube of a cation exchange membrane comprising a fluorocarbon backbone with pendant sulfonic acid groups as ion exchange sites having:
- (1) a length of approximately 50 centimeters;
- (2) a helical configuration with a diameter of less than 5 millimeters;
- and
- (3) its terminal ends inserted into entry and exit tubes;
- and
- (b) a nylon filament within the helix;
- and
- (c) a hollow outer tube having:
- (1) a larger diameter and longer length than the helix;
- (2) the helix enclosed therein;
- (3) inlet and outlet apertures;
- and
- (4) sealed ends around the entry and exit tubes leading to the helix.
11 more elements
A method for making an ion exchange apparatus comprising the steps of:
- (a) inserting a filament into an inner tube of an ion exchanging polymer tubing;
- (b) winding the filament containing tubing around a support rod to form a helix;
- (c) tying the ends of the tubing to the support rod;
- (d) exposing the supported tubing to sufficient heat so that it becomes hardened in the helical shape;
- (e) removing the support rod and the ties;
- (f) inserting the terminal ends of the helix into entry and exit tubes;
- (g) providing an outer tube, having a larger diameter than the helix and having inlet and outlet apertures for regenerating solution;
- (h) inserting the helix into the outer tube so that the entry and exit tubes leading to the helix extend beyond the outer tube;
- and
- (i) sealing the ends of the outer tube around the entry and exit tubes leading to the helix.
7 more elements
A method of ion exchange chromatography comprising the steps of:
- (a) providing a helix shaped inner tube of an ion exchange polymer having a diameter of less than 10 millimeters and its terminal ends inserted into entry and exit tubes;
- (b) inserting a filament into the helix shaped inner tube;
- (c) enclosing the helix in a hollow outer tube having a larger diameter and longer length than the helix and inlet and outlet apertures;
- (d) sealing the ends of the outer tube around the entry and exit tubes leading to the helix;
- (e) connecting the helix entry tube to the vessel containing the solution to undergo ion exchange;
- (f) releasing the solution to the helical tube;
- (g) simultaneously directing the flow of an appropriate regenerant solution into the outer tube;
- and
- (h) separately collecting the ion exchanged solution at the other end of the helix.
6 more elements
A method of ion exchange chromatography comprising the steps of:
- (a) providing an ion exchanging inner tube of a cation exchange membrane comprising a fluorocarbon backbone with pendant sulfonic acid groups as ion exchange sites having:
- (1) a length of approximately 50 centimeters;
- (2) a helical configuration with a diameter of less than 5 millimeters;
- and
- (3) its terminal ends inserted into entry and exit tubes;
- (4) a nylon filament contained therein;
- and
- (b) enclosing the helix in a hollow outer tube having a larger diameter and longer length than the helix and having inlet and outlet apertures;
- (c) sealing the ends of the outer tube around the entry and exit tubes leading to the helix;
- (d) connecting the entry tube to the vessel containing the solution to undergo ion exchange;
- (e) releasing the solution to the helical tube so that a flow rate between 0.5 and 5.0 milliliters per minute is established;
- (f) simultaneously directing the flow of an appropriate regenerant solution in the outer tube counter current to the flow of solution in the helix;
- and
- (g) and collecting the ion exchanged solution from the exit tube from the helix.
11 more elements
An apparatus for ion exchange which comprises:
- (a) a substantially linear inner tube of an ion exchanging material having its terminal ends inserted into entry and exit tubes;
- (b) a filament within the inner tube;
- and
- (c) a hollow outer tube having:
- (1) a larger diameter and longer length than the inner tube;
- (2) the inner tube enclosed therein;
- (3) inlet and outlet apertures;
- and
- (4) sealed ends around the entry and exit tubes leading to the inner tube.
6 more elements
Dependencies are inferred from the claim text.