Composite membrane with middle layer for forward osmosis of organic solvent and preparation method and application of composite membrane

A technology of organic solvent and intermediate layer, which is applied in the field of composite membrane with intermediate layer for organic solvent forward osmosis and its preparation. sexual effect

Active Publication Date: 2021-03-23
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] At present, there are very few studies on organic solvent forward osmosis, and the main problem is that the composite membrane has low resistance to organic solvents.

Method used

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  • Composite membrane with middle layer for forward osmosis of organic solvent and preparation method and application of composite membrane
  • Composite membrane with middle layer for forward osmosis of organic solvent and preparation method and application of composite membrane
  • Composite membrane with middle layer for forward osmosis of organic solvent and preparation method and application of composite membrane

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preparation example Construction

[0027] A composite membrane with an intermediate layer for organic solvent forward osmosis, which is composed of a support layer, an intermediate layer and a dense separation layer; the material of the support layer is polyimide, and the intermediate layer is composed of cyclodextrin supramolecular polymerization composition, the material of the separation layer is polyamide, the porosity of the support layer is 20-85%; Supramolecular polymer; the separation layer has a thickness of 0.1-5 μm, and its preparation method includes the following steps:

[0028] (1) Preparation of polyimide base film:

[0029] The polyimide, the solvent N-methylpyrrolidone and the polyethylene glycol are mixed so that the mass percent concentration of the polymer is 15-20%. Stir mechanically at 70°C to obtain the casting solution, and let it stand for 12 hours for defoaming. Then transfer the casting solution to a clean flat glass plate and scrape the film with a scraper. At a certain temperatur...

Embodiment 1

[0044] A composite membrane with an intermediate layer for organic solvent forward osmosis, which is composed of a support layer, an intermediate layer and a dense separation layer; the material of the support layer is polyimide, and the intermediate layer is composed of cyclodextrin supramolecular polymerization Composition, the material of described separating layer is polyamide, and its preparation method comprises the following steps:

[0045] (1) Dry 5g of polyimide in an oven at 80°C for 12 hours, mix polyimide, solvent N-methylpyrrolidone and polyethylene glycol according to the mass ratio of 18:16:66, and dry at 70°C Under mechanical stirring for 8 hours, a homogeneous polyimide casting solution was obtained. Let it stand for defoaming for 12 hours, then transfer the casting solution to a clean and flat glass plate, and scrape the film with a spatula. The scraped film was transferred to a deionized water coagulation bath to solidify at room temperature; then the obtai...

Embodiment 2

[0050] A composite membrane with an intermediate layer for organic solvent forward osmosis, which is composed of a support layer, an intermediate layer and a dense separation layer; the material of the support layer is polyimide, and the intermediate layer is composed of cyclodextrin supramolecular polymerization Composition, the material of described separating layer is polyamide, and its preparation method comprises the following steps:

[0051] (1) Dry 5g of polyimide in an oven at 80°C for 12 hours, mix polyimide, solvent N-methylpyrrolidone and polyethylene glycol according to the mass ratio of 18:16:66, and dry at 70°C Under mechanical stirring for 8 hours, a homogeneous polyimide casting solution was obtained. Let it stand for defoaming for 12 hours, then transfer the casting solution to a clean and flat glass plate, and scrape the film with a spatula. Immediately soak the scraped film at room temperature into a coagulation bath of deionized water, the solvent N-methyl...

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Abstract

The invention relates to a composite membrane with a middle layer for forward osmosis of an organic solvent as well as a preparation method and application of the composite membrane. The composite membrane comprises a supporting layer, the middle layer and a compact separation layer, the material of the supporting layer comprises polyimide, the material of the middle layer comprises a cyclodextrinsupramolecular polymer, and the separation layer is made of polyamide. The composite membrane is used for forward osmosis treatment or recovery of an organic solvent system. Compared with the prior art, the invention has the advantages of high organic solvent resistance, high solute rejection rate in the forward osmosis process of the organic solvent and the like.

Description

technical field [0001] The invention relates to the technical field of polymer separation membranes, in particular to a composite membrane with an intermediate layer for organic solvent forward osmosis and its preparation method and application. Background technique [0002] As an emerging membrane separation process, forward osmosis technology has the advantages of low energy consumption, good interception effect and light membrane fouling, and has broad application prospects in the fields of wastewater treatment and food processing. Organic solvents are used in a large amount in the food and pharmaceutical industry and most of them are toxic. Effective recycling and treatment of them can help reduce environmental pollution and reduce business costs. Forward osmosis technology has the characteristics of low energy consumption and low membrane pollution, and has great potential in the field of organic solvent recovery and treatment. [0003] At present, there are very few s...

Claims

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Application Information

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IPC IPC(8): B01D71/64B01D61/00B01D67/00B01D69/12
CPCB01D61/002B01D67/0002B01D69/12B01D71/64
Inventor 伍艳辉黄翰生梁婧怡吴昊
Owner TONGJI UNIV
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