Method for purification of polyether polymers and mixtures resulting therefrom
View Patent ↗A method for the purification of aromatic polyether polymers prepared by a halide displacement polymerization process comprises adsorbing the catalyst with an alkali metal halide to form an adsorbent component and then removing the adsorbent component. Mixtures resulting from this method are also discussed.
1. A process comprising sequentially:
(a) subjecting a first mixture to a first temperature, wherein the first mixture comprises (i) an aromatic polyether made by a halide displacement polymerization process and selected from the group polyetherimides, polyethersulfones, polyetherketones, polyetheretherketones, and combinations thereof, (ii) a guanidinium catalyst, (iii) an alkali metal halide, (iv) an acid component selected from the group consisting of acids, acid salts, and combinations thereof, and (v) an organic solvent;
(b) subjecting the first mixture to a second temperature for a time sufficient to promote adsorption of the guanidinium catalyst with the alkali metal halide, thereby forming an adsorbed component comprising the guanidinium catalyst and alkali metal halide;
(c) using a liquid-solid separation technique to remove the adsorbed component from the first mixture at a third temperature to form a second mixture;
wherein less than 0.005 weight percent (50 ppm) of water is present during the process, based on the total weight of the first mixture
wherein the first temperature is higher than the second temperature and the second temperature is 23° to 150° C.
2. The process of claim 1 , wherein the time for (b) is greater than or equal to 20 seconds and less than 200 hours.
3. The process of claim 1 , wherein the removing of the adsorbed component is carried out by a member selected from the group consisting of filtering, centrifugation, decantion, solid-liquid separation, and combinations thereof.
4. The process of claim 1 , wherein the process further comprises adding a component selected from the group consisting of organic solvents during a step selected from the group consisting of step(a), step(b), combinations thereof, and between steps (a) and (b),
wherein addition of the components results in the formation of a diluted first mixture.
5. The process of claim 1 , wherein the first mixture and the adsorbed component comprise a catalyst byproduct and the adsorbed component comprises the catalyst byproduct in an amount greater than or equal to 1 milligram of catalyst byproduct per gram of alkali metal halide.
6. The process of claim 1 , wherein the adsorbed component comprises the catalyst byproduct in an amount greater than or equal to 60 milligrams of catalyst byproduct per gram of alkali metal halide.
7. The process of claim 1 , wherein the adsorbed component comprises the catalyst in an amount greater than or equal to 4 milligrams of catalyst per gram of alkali metal halide.
8. The process of claim 1 , wherein the adsorbed component comprises the catalyst in an amount greater than or equal to 25 milligrams of catalyst per gram of alkali metal halide.
9. The process of claim 1 , wherein the third temperature differs from the second temperature by less than 10° C.
10. The process of claim 1 , wherein the third temperature differs from the second temperature by less than 5° C.
11. The process of claim 1 , wherein the third temperature differs from the second temperature by less than 2° C.
12. The process of claim 1 , wherein the alkali metal halide consists of alkali metal halide produced by the polymerization process.
13. A process comprising:
(a) quenching a halide displacement polymerization mixture at a first temperature with acid to form a quenched polymerization mixture wherein the polymerization mixture comprises (i) an aromatic polyether component selected from the group polyetherimides, polyethersulfones, polyetherketones, polyetheretherketones, and combinations thereof; (ii) hexaethyl guanidinium chloride (iii) sodium chloride (iv) pentaethyl guanidinine, and (vi at least one organic solvent;
(b) subjecting the quenched polymerization mixture to a second temperature for a time sufficient to promote adsorption of the guanidinium chloride and the penta ethyl guanidinine with the sodium chloride, thereby forming an adsorbed component comprising the guanidinium chloride and the penta ethyl guanidinine and the sodium chloride;
(c) using a liquid-solid separation technique to remove the adsorbed component from the quenched polymerization mixture to form a filtered mixture, wherein the adsorbed component comprises greater than or equal to 1 milligram pentaethyl guanidinine per gram of sodium chloride and greater than or equal to 4 milligram of the guanidinium chloride per gram of sodium chloride and wherein the polyether polymer, after isolation, contains less than 50 ppm of the sodium chloride
wherein second temperature is lower than the first temperature and the second temperature is 23° to 150° C.
14. The process of claim 13 , wherein the process further comprises adding an organic solvent to the quenched polymerization mixture prior to adsorption.
15. The process of claim 13 , wherein the adsorbed component is removed at the second temperature.
16. The process of claim 13 , wherein the first and second temperatures are both less than to 120° C.