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A kind of forward osmosis composite membrane based on macroporous base membrane and preparation method thereof

A composite membrane, large pore size technology, used in chemical instruments and methods, membranes, membrane technology, etc., can solve the problems of low porosity, poor hydrophilicity, poor physical and chemical stability, etc. The effect of short mass distance and low mass transfer resistance

Active Publication Date: 2022-01-04
NINGBO UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the base membranes used for forward osmosis composite membranes mainly use ultrafiltration membranes such as polyethersulfone, polysulfone, and cellulose acetate as porous support layers, which have small pore diameters (below 0.1 micron), low porosity, and relatively hydrophilic properties. Poor, tortuous flow channels, poor physical and chemical stability, etc., so that the internal concentration polarization of the prepared forward osmosis composite membrane is serious, the water flux is low, the pollution resistance is poor, and even the ultra-thin desalination layer is incomplete and easy to fall off, etc. phenomenon, which reduces the efficiency of the forward osmosis process, increases the cost, and is still difficult to meet the requirements of industrial forward osmosis applications

Method used

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  • A kind of forward osmosis composite membrane based on macroporous base membrane and preparation method thereof
  • A kind of forward osmosis composite membrane based on macroporous base membrane and preparation method thereof
  • A kind of forward osmosis composite membrane based on macroporous base membrane and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0030] Step 1: The polytetrafluoroethylene microporous membrane with a pore size of 0.2 μm, a porosity of 89%, and a thickness of 50 μm prepared by a biaxial stretching method is prepared by a physical modification method of coating polyvinyl alcohol to prepare a super-hydrophilic large-pore base membrane. The water dynamic contact angle of the film drops to 0 degrees within 3 seconds. Put the base film in an oven at 80°C, heat treatment and set it for 20 minutes;

[0031] Step 2: Weigh 1g of m-phenylenediamine, 0.05g of sodium lauryl sulfate, and 0.25g of triethylamine, dissolve them in 48.7g of water, make a water phase monomer solution and put it in a water bath at 15°C; weigh 0.1 g of trimesoyl chloride was dissolved in 49.9 g of n-hexane to make an oil phase monomer solution and placed in a water bath at 15°C;

[0032] Step 3: Put the above base film in the interface polymerization mold, add deionized water to the mold to wet the base film, then remove the excess deioniz...

Embodiment 2

[0035] Step 1: The polytetrafluoroethylene microporous membrane with a pore size of 0.45 μm, a porosity of 91%, and a thickness of 40 μm prepared by the biaxial stretching method is prepared by a physical modification method of coating polyvinyl alcohol to prepare a super-hydrophilic large-pore base membrane. The water dynamic contact angle of the film drops to 0 degrees within 2 seconds. Put the base film in an oven at 100°C, heat treatment and set it for 10 minutes;

[0036] Step 2: Weigh 1.2g of m-phenylenediamine, 0.06g of sodium lauryl sulfate, and 0.34g of triethylamine, dissolve them in 48.4g of water, make a water phase monomer solution and put it in a water bath at 11°C; weigh Take 0.15 g of trimesoyl chloride, dissolve it in 49.85 g of n-hexane to make an oil phase monomer solution, and put it in a water bath at 11°C;

[0037] Step 3: Put the above base film in the interface polymerization mold, add deionized water to the mold to wet the base film, then remove the e...

Embodiment 3

[0040] Step 1: The polytetrafluoroethylene microporous membrane with a pore size of 0.65 μm, a porosity of 93%, and a thickness of 30 μm prepared by a biaxial stretching method is prepared by a physical modification method of coating polyvinyl alcohol to prepare a super-hydrophilic large-pore base membrane. The water dynamic contact angle of the film drops to 0 degrees within 2 seconds. Put the base film in an oven at 120°C, heat treatment and set it for 5 minutes;

[0041] Step 2: Weigh 0.75g of m-phenylenediamine and 0.25g of triethylamine, dissolve them in 49g of water, make a water phase monomer solution and put it in a water bath at 20°C; weigh 0.15g of trimesoyl chloride, dissolve in Prepare an oil phase monomer solution in 49.85g of ethylcyclohexane and put it in a water bath at 20°C;

[0042] Step 3: Put the above base film in the interface polymerization mold, add 2% glycerin aqueous solution to the mold to wet the base film, then remove the excess wetting liquid on ...

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Abstract

The invention discloses a forward osmosis composite membrane based on a large-aperture base membrane and a preparation method thereof. The forward osmosis composite membrane is composed of a large-aperture base membrane and an ultra-thin desalination layer; it is super-hydrophilic and has a pore size of 0.1-1 micron. The microporous membrane with a porosity of more than 85% is a large-pore base membrane. The large-pore base membrane is heat-treated, and then the aqueous phase solution of the polyamine active monomer and the oil phase solution of the acyl chloride active monomer are polymerized on the surface of the base membrane through the interface. The ultra-thin desalination layer of polyamide was prepared by the method. The invention effectively solves the adverse effect of the current ultrafiltration membrane structure with small pore size as the base membrane on the performance of the forward osmosis composite membrane, eliminates the problem that the ultra-thin desalination layer of polyamide is not firmly combined with the base membrane, and greatly improves the performance of the membrane. The internal concentration polarization phenomenon reduces the mass transfer distance and resistance, improves the water flux, salt interception rate and anti-pollution characteristics of the forward osmosis composite membrane, and has a good application prospect.

Description

technical field [0001] The invention belongs to the technical field of polymer membrane separation, and in particular relates to a forward osmosis composite membrane based on a base membrane with a large pore size and a preparation method thereof. Background technique [0002] Membrane separation technology has been widely used as a new type of high-efficiency separation, concentration, purification and purification technology. Nanofiltration (NF), reverse osmosis (RO) and forward osmosis (FO) are currently developing the most rapidly in the entire market and growing rapidly. Among them, the forward osmosis membrane separation process is driven by the osmotic pressure difference on both sides of the membrane. Compared with the membrane separation process driven by hydraulic pressure difference, the process does not require external pressure, and has low energy consumption, low pollution, easy cleaning and high water recovery. Potential advantages, so it has broad application...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D69/12B01D71/36B01D69/02B01D67/00B01D61/00
CPCB01D61/002B01D67/0002B01D69/02B01D69/12B01D71/36B01D2325/02Y02A20/131
Inventor 邱慧莹肖通虎李雪燕
Owner NINGBO UNIV
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