Process for separating azeotropic or close-boiling mixtures by u

Details Process for separating azeotropic or close-boiling mixtures by u Process for separating azeotropic or close-boiling mixtures by u

1990-07-12

1991-11-19

Spear, Frank

Liquid purification or separation

Processes

Liquid/liquid solvent or colloidal extraction or diffusing...

210640, 21050036, 427245, B01D 6136

Patent

active

050664034

ABSTRACT:
The present disclosure is directed to composite membranes formed by casting thin (about 8 to about 20 microns) film of perfluorosulfonic acid (PFSA) polymer on a porous matrix of polytetrafluoroethylene (PTFE). The ion exchange groups in these membranes are protons and can be substituted with metal ions such as Na.sup.+, Ca.sup.+, Ag.sup.+, etc. or by organic ligands. Alternatively, even thinner membranes (from about 1 micrometer or thinner up to 20 micrometers) can be formed by spraying a PPSA polymer solution on a porous matrix. The porous matrix may comprise polytetrafluoroethylene alone or in combination with a thermobonded polypropylene support.
Both the acid and the substituted membranes have remarkable affinity for polar compounds or mixtures of polar and non-polar compounds such that azeotropic mixtures of organic compounds as well as close-boiling liquid mixtures can be easily separated at good permeation rates using the technique of pervaporation.
The membrane of the present invention gives considerably higher fluxes while maintaining good separation factors. The method of the preparation of the membrane is simple and the resulting membrane is mechanically strong.

REFERENCES:
patent: 4035291 (1977-07-01), Chiang et al.
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patent: 4663013 (1987-05-01), Kumagai et al.
patent: 4728429 (1988-03-01), Cabasso et al.
patent: 4778596 (1988-10-01), Linder et al.
patent: 4902416 (1990-02-01), Schroeder et al.
Aptel et al., J. Memb. Sci., 1 (1976), pp. 271-287.
Cabasso I., Ind. Eng. Chem. Prod. Res. Dev., 22 (1983), pp. 313-319.

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