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US 2025/0083111 A1Published application
Linear multifunctional aliphatic and hyper-cross-linked polyamide membrane
AssigneeKing Fahd University of Petroleum and Minerals
InventorsUmair BAIG, Abdul WAHEED
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Abstract
A filtration membrane includes a thermoplastic substrate, a first layer comprising a polysulfone, a polyvinylpyrrolidone, and a tetramine, and a second layer comprising the tetramine and reacted units of a phthaloyl chloride cross-linked to form a polyamide. A method of preparing the filtration membrane by impregnating tetramine in an ultrafiltration support matrix for rapidly fabricating a hyper-cross-linked polyamide membrane. The membrane prepared by the method of present disclosure can be used for nanofiltration.
Claims20
1:
- A filtration membrane, comprising, in the following order:
- a thermoplastic substrate,
- a first layer comprising a polysulfone, a polyvinylpyrrolidone, and a tetramine,
- a second layer comprising the tetramine and reacted units of a phthaloyl chloride cross-linked with the tetramine to form a polyamide.
1 more element
2:
- The filtration membrane of claim 1, wherein the tetramine in the second layer is physically adsorbed and dispersed in the polysulfone and the polyvinylpyrrolidone.
3:
- The filtration membrane of claim 1, wherein the tetramine in the second layer is covalently cross-linked with reacted units of the phthaloyl chloride through at least one of a primary amine group and a secondary amine group of a first tetramine and at least one of a primary amine group and a secondary amine group of a second tetramine.
4:
- The filtration membrane of claim 1, wherein the polyamide in the second layer is in the form of a hyper-branched cross-linked matrix.
5:
- The filtration membrane of claim 1, wherein the tetramine is N,N′-bis(3-aminopropyl)ethylenediamine.
6:
- The filtration membrane of claim 1, wherein the second layer is in the form of nanoparticles with a diameter of 10 to 500 nm.
7:
- The filtration membrane of claim 1, wherein the first layer is in the form of vertical hollow tubes having a diameter of 0.1 to 10 μm and a length of 1 to 50 μm.
8:
- The filtration membrane of claim 1, wherein the second layer covers the vertical hollow tubes of the first layer.
9:
- The filtration membrane of claim 1, wherein the second layer has a thickness of 0.1 to 10 μm.
10:
- The filtration membrane of claim 1, having a water contact angle is from 60 to 900.
11:
- The filtration membrane of claim 1, comprising carbon in an amount of 78 to 81% by weight, oxygen in an amount of 10 to 13% by weight, sulfur in an amount of 5 to 7% by weight, and nitrogen in an amount of 2 to 4% by weight based on a total weight of the membrane.
12:
- The filtration membrane of claim 1, wherein a surface roughness is from 9 to 11 nm.
13:
- The filtration membrane of claim 1, wherein the membrane has a rate of flux of 30 to 40 L m−2 h−1 at a pressure of 20 bar.
14:
- The filtration membrane of claim 1, made by a process comprising:
- dissolving the polysulfone and the polyvinylpyrrolidone in a solvent to form a solution;
- fixing the thermoplastic substrate on a glass surface;
- spreading the solution on the thermoplastic substrate fixed on the glass surface to form a support;
- soaking the support in an organic anionic surfactant;
- dipping the support in an aqueous solution of the tetramine to adsorb the tetramine to the support and form the first layer;
- contacting the first layer with an organic solution of the phthaloyl chloride to form the polyamide;
- and
- heating to form the filtration membrane.
6 more elements
15:
- The method of claim 14, wherein the heating is from 50 to 120° C.
16:
- The method of claim 15, wherein the heating occurs for 20 to 120 minutes.
17:
- A method of nanofiltration, comprising:
- passing a composition through the filtration membrane of claim 1,
- wherein the composition comprises at least solvents and solutes,
- collecting a permeate passing through the filtration membrane to obtain a purified composition having a reduced amount of solutes.
1 more element
18:
- The filtration membrane of claim 1, wherein the membrane has a rejection profile of solutes from 85 to 100% by weight.
19:
- The method of claim 17, further comprising:
- contacting the filtration membrane with an aqueous acidic solution before passing a composition through the filtration membrane.
20:
- The method of claim 17, wherein passing a composition through the filtration membrane occurs for 0.5 to 15 hours.