PREPARATION METHOD FOR POLYAMIDE NANOFILTRATION MEMBRANE APPLICABLE TO TREATMENT OF OILFIELD REINJECTION WATER

WIPO Patent Application WO/2023/198214

A1

A preparation method for a polyamide nanofiltration membrane applicable to the treatment of oilfield reinjection water. The method comprises: adding a pore-forming agent and a polymer into a high-polarity organic solvent, stirring same while heating to dissolve same, so as to prepare a membrane casting solution, and scrape coating a polyester non-woven fabric with the solution to prepare a membrane; and immersing the scraped membrane serving as a supporting layer into an aqueous-phase solution containing an aqueous-phase additive, an acid acceptor and a polyamine monomer for 0.5-2 min, drying the membrane in shade, removing redundant water drops on the surface thereof, immersing same into an organic-phase solution containing a polybasic acid chloride for 0.5-2 min, taking out the membrane, air-drying same at room temperature, washing same with deionized water, and drying same to obtain a polyamide composite nanofiltration membrane.

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LIU BAOSHAN (CN)
NIE MING (CN)
CHEN AIMIN (CN)
LIANG SONGMIAO (CN)
HU LIJIE (CN)

PCT/CN2023/088554

October 19, 2023

April 15, 2023

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CNOOC TIANJIN CHEMICAL RES & DESIGN INST CO LTD (CN)
CHINA NAT OFFSHORE OIL CORP (CN)
VONTRON TECH CO LTD (CN)

B01D67/00; B01D61/02; B01D69/02; B01D69/12; B01D71/56; C02F1/44; C02F103/10

CN114950136A	2022-08-30
CN114130206A	2022-03-04
CN110314559A	2019-10-11
US20180326362A1	2018-11-15

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