RU-2026109656-A - POSITIVELY CHARGED ACID- AND ALKALI-RESISTANT COMPOSITE NANOFILTRATION MEMBRANE, ITS PRODUCTION METHOD AND APPLICATION

Inventors

• У, Чанцзян
• ЧЖУН, Тянь
• ЧЖАО, Гокэ
• Чжан, Ян
• ЛЮ, Ицюнь
• ПАНЬ, Гоюань
• ТАН, Гунцин
• ЮЙ, Хао
• ЧЖАО, Мухуа
• Ли, Юй

Assignees

• ЧАЙНА ПЕТРОЛЕУМ ЭНД КЕМИКАЛ КОРПОРЕЙШН
• СИНОПЕК (БЭЙЦЗИН) РИСЕРЧ ИНСТИТЬЮТ ОФ КЕМИКАЛ ИНДАСТРИ КО., ЛТД.

Dates

Publication Date

20260504

Application Date

20240905

Priority Date

20230905

Claims (20)

1. 1. A positively charged acid- and alkali-resistant composite nanofiltration membrane, characterized in that the positively charged acid- and alkali-resistant composite nanofiltration membrane sequentially includes a bottom layer, a porous intermediate layer, and an acid- and alkali-resistant separating layer;
2. wherein the acid- and alkali-resistant separating layer contains:
3. (1) a quaternary ammonium salt group represented by formula I and/or a quaternary phosphonium salt group represented by formula II, which are grafted to the acid- and alkali-resistant separating layer via an N atom;
4. Formula I; Formula II;
5. where R 1 represents is a substituted or unsubstituted C1-C9 alkylene group or a phenylene group; R 2 , R 3 and R 4 independently selected from a C1-C3 alkyl group or a phenyl group; R 5 represents a C1-C6 alkylene group, a C7-C10 phenylene group, or an aralkylene group; R 6 , R 7 and R 8 independently represent a phenyl group or a C7-C10 aralkyl group; X represents halogen; or
6. (2) a quaternary ammonium salt structure that includes the structural formula represented by formula III and/or the structural formula represented by formula IV,
7. Formula III; Formula IV;
8. X is a halogen; n is an integer from 0 to 10; m is an integer from 2 to 10;
9. wherein the acid- and alkali-resistant separating layer is at least one of the following: a polyurea separating layer, a polytriazine amine separating layer, a polysulfonamide separating layer, a poly(triazine amine urea) separating layer, a poly(sulfonamide urea) separating layer, a poly(triazine amine sulfonamide) separating layer, and a poly(triazine amine sulfonamide urea) separating layer.
10. 2. A positively charged acid- and alkali-resistant composite nanofiltration membrane according to claim 1, in which, in the case of determination (1),
11. R 1 is a substituted or unsubstituted C1-C9 alkylene group or phenylene group, wherein the substituent is a carboxyl group, a nitro group, an amino group, a silyl group, a carbonyl group, an ether or an ester group; preferably, R 1 is an unsubstituted C1-C9 alkylene group or a phenylene group; preferably, R 1 is an unsubstituted C1-C6 alkylene group or a phenylene group; preferably, R 1 is an unsubstituted C1-C3 alkylene group; and/or
12. R 2 , R 3 , R 4 independently selected from a C1-C3 alkyl group; preferably, R 2 , R 3 , R 4 independently represent CH 3 ; and/or
13. R 5 is a C1-C3 alkylene group, a phenylene group, or a C8-C10 aralkylene group; preferably, R 5 is a C1-C3 alkylene group or a C8-C10 aralkylene group; and/or
14. R 6 , R 7 , R 8 each independently represent a phenyl group or a C8-C10 aralkyl group; preferably, R 6 , R 7 , R 8 each independently represent a phenyl group; and/or
15. X is Cl, Br, or I.
16. 3. A positively charged acid- and alkali-resistant composite nanofiltration membrane according to claim 1, in which, in relation to (2),
17. X is Cl, Br, or I; and/or
18. n is an integer between 0 and 7; and/or
19. m is an integer between 2 and 8.
20. 4. A positively charged acid- and alkali-resistant composite nanofiltration membrane according to any one of claims 1 to 3, wherein the acid- and alkali-resistant separation layer is at least one of a polyurea separation layer, a polytriazine amine separation layer, and a polysulfonamide separation layer.