Liquid purification or separation – Processes – Liquid/liquid solvent or colloidal extraction or diffusing...
Patent
1985-02-12
1987-01-06
Spear, Frank
Liquid purification or separation
Processes
Liquid/liquid solvent or colloidal extraction or diffusing...
210654, B01D 1300
Patent
active
046345310
ABSTRACT:
The present invention relates to the membrane treatment method for semipermeable membranes, that is, a method wherein it is characterized that not only remarkable improving effect of selective separation performance of semipermeable membranes is obtained but also durability of said improving effect for selective separation performance is improved by means of extremely simple and easy procedures such as said semipermeable membranes are successively brought into contact with very dilute of aqueous solutions including effective substances which are individually water-soluble in due order and for a short time, where said effective water-soluble substances form water-insoluble or very little water-soluble materials thereof fixed on the surface of said semipermeable membranes.
The aforesaid remarkable effect is observed especially in the case of semipermeable membranes consisted of cross-linked polymers based of furfuryl alcohol including furfuryl alcohol as an essential monomer component, and polyamides, when, at the same time, the due combination of water-soluble amines and water-soluble aldehyde is employed as said aqueous solutions including effective water-soluble substances.
REFERENCES:
patent: 3373056 (1968-03-01), Martin
patent: 3877978 (1975-04-01), Kremen et al.
patent: 3926798 (1975-12-01), Cadotte
patent: 4039440 (1977-08-01), Cadotte
patent: 4226673 (1980-10-01), Fremont
Cadotte, et al., Post Treatment Process for Reverse Osmosis Membranes, Jan. 1981, pp. 1-35, available from NTIS, Springfield, Va. 22161.
Sourirajan, Ed., Reverse Osmosis and Ultrafiltration, 1985, pp. 1-19, published by ACS.
Kurihara Masaru
Nakagawa Yukio
Oto Katsufumi
Spear Frank
Toray Industries Inc.
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