Claims
- 1. A permselective polymeric asymmetric membrane comprising
- i. a diacyl hydrazide-containing, substantially linear, aromatic, synthetic organic polymer comprising alternating linking groups and organic radicals, and
- ii. one or a mixture of Co(II), Ni(II), Cu(II) and Pd(II) metal wherein the metal is in square planar coordination complex relationship with the polymer of (i),
- the permselective membrane characterized by having metal complexed with the polymer in the amount of at least one-gramatomic weight of metal for each 20 gram-formula-weights of linking groups,
- the polymer of (i) being further characterized by having the formula
- (-L-R-).sub.n
- wherein
- the --L-- groups and --R-- radicals are alternating, each --L-- group is a linking group and at least about 50 percent of the --L-- groups contain a nitrogen atom in the polymer chain, and at least 5 percent of the --L-- groups contain the diacyl hydrazide group ##EQU7## each --R-- group is an organic radical and at least about 50 percent of the --R-- groups consist essentially of a 5-member ring or a 6-member ring subject to resonance bonding; and
- the degree of polymerization is defined by n, an integer sufficiently large to provide film-forming molecular weight; the polymer having a solubility at 25.degree.C. of at least about 10 percent by weight in a solvent medium consisting essentially of from 0 to 3 percent by weight of lithium chloride dissolved in at least on member selected from the group consisting of dimethylacetamide, dimethyl sulfoxide, N-methylpyrrolidone and hexamethylphosphoramide.
- 2. A membrane according to claim 1 wherein at least 5 percent of the linking groups contain the diacyl hydrazide group and the balance of the linking groups are selected from at least one member of the group consisting of amide groups, oxamide groups, acyl hydrazide groups, semi-carbazide groups, urea groups, and mixtures thereof.
- 3. A membrane according to claim 2 wherein the linking groups are amide groups and diacyl hydrazide groups.
- 4. A membrane according to claim 3 wherein the metal is Cu(II).
- 5. A membrane according to claim 3 wherein 50 percent of the linking groups present are amide groups and 50 percent of the linking groups are diacyl hydrazide groups.
- 6. A membrane according to claim 5 wherein the metal is Cu(II).
- 7. A membrane according to claim 2 wherein the linking groups are diacyl hydrazide groups.
- 8. A membrane according to claim 7 wherein the metal is Cu(II).
- 9. A membrane according to claim 2 wherein the metal is Cu(II).
- 10. A membrane according to claim 1 wherein the metal is Cu(II).
- 11. A process for preparing the membranes of claim 1 comprising reacting
- a polymer-liquid pellicle of a diacyl hydrazidecontaining, substantially linear, aromatic, synthetic organic polymer comprising alternating linking groups and organic radicals, said pellicle having a porous side reactable with a metal salt solution, with
- a metal salt solution comprising a salt of a metal or mixture of metals that will form square planar coordination complexes with the polymer, said metal selected from the group Co(II), Ni(II), Cu(II) and Pd(II), in a medium therefor, at a temperature between about -25.degree.C. to 50.degree.C., said reaction occurring at said porous side of said pellicle.
- 12. A process according to claim 11 wherein the polymer-liquid pellicle is selected from a member of the group consisting of an asymmetric permselective membrane pellicle having as liquid therein a nonsolvent for the polymer, and a solution pellicle having as liquid therein a solvent for the polymer.
- 13. A process according to claim 12 wherein the polymer-liquid pellicle is an asymmetric permselective membrane pellicle having as liquid therein a nonsolvent for the polymer.
- 14. A process according to claim 12 wherein the polymer-liquid pellicle is a solution pellicle having as liquid therein a solvent for the polymer.
- 15. A process according to claim 14 wherein the solution pellicle contains additionally at least one member of the group consisting of plasticizer, water and polymer-solubilizing salt.
- 16. A process according to claim 11 comprising contacting the polymer-liquid pellicle with the medium of the metal salt solution before reacting the pellicle with the metal salt solution.
- 17. A process for the reverse osmosis rejecting of solute from an aqueous solution, comprising contacting the permselective membrane of claim 1 with the aqueous solution at a pressure greater than the osmotic pressure of the solution.
CROSS-REFERENCE TO RELATED APPLICATION
This is a continuation-in-part application of copending application bearing U.S. Ser. No. 249,210, filed on May 1, 1972, now abandoned.
US Referenced Citations (3)
Number |
Name |
Date |
Kind |
3373056 |
Martin |
Mar 1968 |
|
3449245 |
Johnson et al. |
Jun 1969 |
|
3567632 |
Richter et al. |
Mar 1971 |
|
Non-Patent Literature Citations (1)
Entry |
Metal Chelates of Polyhydrazides, Journal of Polymer Sc., Part A, Vol. 2, pp. 1825-1832 (1964), Frazer & Wallenberger. |
Continuation in Parts (1)
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Number |
Date |
Country |
Parent |
249210 |
May 1972 |
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