High-temperature resistance double-layer forward osmosis composite film and preparation method thereof
A high-temperature-resistant polymer and high-temperature-resistant technology, which is applied in semi-permeable membrane separation, chemical instruments and methods, membrane technology, etc., can solve the problem of severe internal concentration polarization, limited processing range of raw material solution, and low rejection rate of monovalent salts To achieve the effect of improving water flux and treatment efficiency, reducing concentration polarization, and controlling conditions
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[0035] Example 1:
[0036] A high-temperature-resistant double-skin layer forward osmosis composite membrane of the present invention includes a non-woven fabric layer 3. The upper and lower surfaces of the non-woven fabric layer 3 are provided with a high-temperature resistant porous support membrane layer 2 and the high-temperature resistant porous support membrane layer 2 There is a polyamide separation layer 1 on each of them, and two polyamide separation layers 1 constitute the double skin layer of the forward osmosis composite membrane; the high temperature resistant porous support membrane layer 2 is mainly formed by the high temperature resistant polymer poly(phthalazinone ether sulfone ketone), The thickness (single layer, the same below) is 20μm.
[0037] A method for preparing the high-temperature-resistant double-skin layer forward osmosis composite membrane of this embodiment includes the following steps:
[0038] (1) Preparation of high temperature resistant porous su...
Example Embodiment
[0052] Example 2:
[0053] A high-temperature-resistant double-skin layer forward osmosis composite membrane of the present invention includes a non-woven fabric layer. The upper and lower surfaces of the non-woven fabric layer are provided with a high-temperature resistant porous support film layer, and the high-temperature resistant porous support film layer is provided with a The polyamide separation layer, the two polyamide separation layers constitute the double skin layer of the forward osmosis composite membrane; the high temperature resistant porous support membrane layer is mainly formed of the high temperature resistant polymer poly(phthalazinone ether sulfone ketone), and the thickness is 20 μm.
[0054] A method for preparing the high-temperature-resistant double-skin layer forward osmosis composite membrane of this embodiment includes the following steps:
[0055] (1) Preparation of high temperature resistant porous support membrane layer: add 20g polyethylene glycol 20...
Example Embodiment
[0061] Example 3:
[0062] A high-temperature-resistant double-skin layer forward osmosis composite membrane of the present invention includes a non-woven fabric layer. The upper and lower surfaces of the non-woven fabric layer are provided with a high-temperature resistant porous support film layer, and the high-temperature resistant porous support film layer is provided with a The polyamide separation layer, the two polyamide separation layers constitute the double skin layer of the forward osmosis composite membrane; the high temperature resistant porous support membrane layer is mainly formed of the high temperature resistant polymer poly(phthalazinone ether sulfone ketone), and the thickness is 20 μm.
[0063] A method for preparing the high-temperature-resistant double-skin layer forward osmosis composite membrane of this embodiment includes the following steps:
[0064] (1) Preparation of high temperature resistant porous support membrane layer: add 20g polyethylene glycol 20...
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